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METODE SISR STORIE INDEX SOIL RATINGS PENILAIAN INDEKS STORIE TANAH INDEKS STORIE. Sumber : STELA – April 2013. SISR: STORIE INDEX SOIL RATINGS.

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METODE SISR

STORIE INDEX SOIL RATINGS

PENILAIAN INDEKS STORIE

TANAH

INDEKS STORIE

Sumber: STELA – April 2013


SISR: STORIE INDEX SOIL RATINGS

IndeksStoriemerupakanmetodepenilaian (rating) tanahberdasarkankarakteristiktanah yang menentukanpotensipemanfaatantanahdankapasitasproduktivitastanah.

Metodeinitidakmemperhitungkanfaktorfisikjlainnyaataufaktorekonomiygmungkinmempengaruhikesesuaiantanamandisuatulokasi.

Analisisnyamudahdilakukan, berbagaikategoridikelompokkanmenjadibeberapakategorisaja.


SISR: STORIE INDEX Soil Ratings

Adaempatatau lima parameter yglazimdievaluasi:

A: Kedalaman Tanah danTekstur;

B: Permeabilitas Tanah;

C: Sifat Kimia Tanah;

D: Drainage, Limpasanpermukaan;

E: Iklim (only if it is not homogeneous, if so than it should not be included in the formula);

Indeksdihitungdenganperkalian parameter ini, yaitu:

Sindex = A x B x C x D x E

Kerugian /kelemahanmetodeiniadalahkalaukitamempunyainilainoluntuksuatukategori, makahasilnyaakannoldantanahdianggaptidaksesuaiuntukpenggunaan.


SISR: STORIE INDEX Soil Ratings

SISTEM PENILAIAN INDEKS STORIE

Sistemini me-Ranking karakteristiktanahmenurutkesesuaiannyauntukpertanian, daritanah-tanah Grade 1 (nilai 80 - 100), ygtidakmempunyaipembatasuntukproduksipertanianhingga Tanah-tanah Grade 6 ( nilainyakurangdari 10), yang tidakcocokuntukpertanian.

Under this system, soils deemed less than prime can function as prime soils when limitations such as poor drainage, slopes, or soil nutrient deficiencies are partially or entirely removed.

The six grades, ranges in index rating, and definition of the grades, as defined by the NRCS, are provided below in Table 3.9, Storie Index Rating System.

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SISR: STORIE INDEX Soil Ratings

IndeskStoriemerupakanmetode semi-kuantitatifpenilaiantanahygdapatdigunakanuntukpertanianirigasiberdasarkan data produktivitastanaman yang dikumpulkandarisurveitanah (Storie 1932; Reganold and Singer 1979).

IndeksStoriemendugaproduktivitastanahberdasarkanempatkarakteristikberikut:

Factor A: Derajatperkembanganprofiltanah;

Factor B: Teksturlapisanpermukaan;

Factor C: Slope;

Factor X: Kondisi lain tanahdanlahan, termasuk drainage, alkalinity, fertility, acidity, erosion, danmicrorelief.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf#page=7


SISR: STORIE INDEX Soil Ratings

Skorberkisar 0 - 100% ditentukanuntuksetiapfaktor, danskor-skorinikemudiandikalikansatu-sama lain untukmendapatkanNilaiIndeks (Storie 1978).

One shortcoming of hand-generated Storie ratings is that the scoring options for a particular factor or subfactor have broad and somewhat arbitrary ranges, which creates a great potential for subjectivity among scientists (O’Geen and Southard 2005).

Our goal was to develop a model in NASIS to rapidly generate Storie ratings without inherent scoring discrepancies associated with hand-generated ratings.

NilaiIndeksStorie =

[(Factor A/100) × (Factor B/100) × (Factor C/100) × (Factor X/100)] × 100

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf#page=7


REVISI SISR: STORIE INDEX Soil Ratings

Storie Index Rating System

Sumber:


REVISI SISR: STORIE INDEX Soil Ratings

Storie Index Rating System

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SISR: STORIE INDEX Soil Ratings

Semenjak 1980, negarabagian California telahmelakukanpemetaanlahan-lahanpertaniannya.

Program pemetaanlahanpertanianinidilakukansecaraterus-menerusdengantingkatpemetaan yang semakin detail.

Kkriteriapemetaanlahanjugadimodifikasiterusmenjadisemakin detail.

KriteriapemetaanlahanmenggunakansistemIndeksStoriedansistem SCS (konservasitanah), tetapijugamempertimbangkankondisifisiksepertisuplai air untukproduksitanaman, soil temperature range, depth of the ground water table, flooding potential, rock fragment content and rooting depth.

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SISR: STORIE INDEX Soil Ratings

Important Farmland Maps for California are compiled using the modified LIM criteria (as described above) and current land use information. The minimum mapping unit is 10 acres unless otherwise specified.

Unit-unit lahanyngkurangdari 10 acre dimasukkankedalamklasifikasi unit-lahandisekitarnya. Petalahanpertanianmengidentifikasitujuhkategoriygberhubungan dg pertanian: Prime farmland, farmland of statewide importance (statewide farmland), unique farmland, Lahanpertanianlainnyaygpentingsecaralokal.

Each is summarized below, based on A Guide to Farmland Mapping and Monitoring Program (1998), prepared by the Department of Conservation.

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SISR: STORIE INDEX Soil Ratings

Arahanuntukpemetaanlahanpertanian yang disusunolehDepartemenKonservasi USDA (1998).

Sumber:


SISR: STORIE INDEX Soil Ratings

Arahanuntukpemetaanlahanpertanian yang disusunolehDepartemenKonservasi USDA (1998).

Sumber:


SISR: STORIE INDEX Soil Ratings

Arahanuntukpemetaanlahanpertanian yang disusunolehDepartemenKonservasi USDA (1998).

Sumber:


SISR: STORIE INDEX Soil Ratings

R. Earl Storie is Professor Emeritus, Soils and Plant Nutrition and former Soil Technologist in the Experiment Station, Berkeley.

INDEKS STORIE

Metodepenilaiantanahini, dikenalsebagaiIndeksStorie, berdasarkanataskarakteristiktanahygmengendalikanpemanfaatanlahandankapasitasproduktiflahan.

It is independent of other physical or economic factors that might determine the desirability of growing certain plants in a given location.

Sumber:


SISR: STORIE INDEX Soil Ratings

MetodeStorie yang telahdirevisimenetapkanFaktor-C yang baruuntukmengevaluasi slope; Faktor-C yang lama sekaranhdimasukkankedalamFaktor-X.

Nilai-nilaipersentasediberikanpadakarakteristiktanah, termasukProfil Tanah (faktor A);

Teksturtanahpermukaan (faktor B);

Slope (faktor C);

Dan kondisi-kondisiygeksklusifprofiltanah, teksturpermukaan, dan slope – misalnya drainage, kandungan alkali, kandunganhara, erosion, dan micro relief (factor X).

Kondisi yang dianggap paling ideal (paling sesuai) untuksetiapfaktordiberinilai 100%.

Nilai-nilaipersentasedariempatfaktoritukemudiandikalikanbersamauntukmenghasilkanNilaiIndeksStoriedaritanah yang dievaluasi.

Sumber:


SISR: STORIE INDEX Soil Ratings

Karakteristikprofiltanah (faktor A) padahakekatnyamerupakanciri-cirilapisanbawahpermukaan.

Tanah dilokasisurvei (mis. Di California) dikelompokkanmenjadibeberapakelompokprofil (mis. ada 9 kelompokprofiltanah).

For example, soils that are deep and readily pervious to roots and water (listed in profile group I in the soil-rating chart) are rated at 100 percent.

Profiltanahdengan subsoil liat-padat (KelompokProfil IV) diberinilailebihrendah.

Primary or residual soils (listed in profile groups VII, VIII, and IX) are rated in accordance with the depth to bedrock.

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SISR: STORIE INDEX Soil Ratings

Tanah-tanahdinilaiberdasarkanteksturtanahlapisanpermukaan (Faktor B).

Medium- textured soils, such as the loams and the silt loams, are rated highest;

the extremes in texture, such as sands and clays, lower.

PenilaiankemiringanlahandimasukkandalamFaktor C.

Nearly level or gently sloping land is rated at 100 per cent.

As the slope increases, the rating for this factor decreases.

As shown in the soil-rating chart, single letters are used to indicate simple slopes , and double letters to indicate compound slopes.

The percent slope expresses the number of feet rise or fall for 100 feet horizontal distance.

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SISR: STORIE INDEX Soil Ratings

Kondisieksklusifprofil, teksturtanah, danslope dimasukkandalamFaktorX padapetapenilaiantanah.

These conditions consist of drainage, alkali or salt content, general nutrient level, acidity, erosion, and microrelief (surface regularity).

If two or more conditions exist that are listed under factor X, the ratings for each are treated independently; that is, they are multiplied in order to secure the factor X rating.

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SISR: STORIE INDEX Soil Ratings

SOIL - RATING CHART

(Storie Soil Index rating =

factor A x factor B x factor C x factor X)

Sumber:


SISR: STORIE INDEX Soil Ratings

FaktorA: KelompokProfil Tanah

FaktorA adalahnilaikarakteristikprofiltanahberdasarkanderajatperkembangantanah. Tanah-tanahdikelompokkankedalam “KelompokProfil” berdasarkantipe landform danperkembanganhorisongenetiknya.

Soil development is defined as the presence of Bt horizons or cemented layers.

Bt horizons are subsurface layers that have an increase in clay relative to the overlaying horizons.

The increase is a result of the translocation of clay by percolating water from overlaying soil horizons.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


SISR: STORIE INDEX Soil Ratings

FaktorA: KelompokProfil Tanah

Untuktanah-tanah alluvial, skor-nyasemakinmenurundengansemakinmeningkatnyaderajatperkembangantanah, seperti yang ditunjukkanoelhadanyahorisonBt dan/atauadanyalapisanpenghambatpertumbuhanakar.

Misalnya, tanah-tanahaluvial yang solumnyadalamdanhomogendiberinilai 100%, sedangkantanah-tanah yang mempunyaihorison Bt padalandsekap-tuadiberinilailebihrendah.

Soils with abrupt textural changes (claypan), duripan, or petrocalcic horizons (hardpans) are rated lower still.

For soils derived from bedrock, scoring is based on depth to a lithic (hard rock) or paralithic (soft rock) contact and the degree of soil development in horizons overlying these layers (Storie 1932, 1978).

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


SISR: STORIE INDEX Soil Ratings

Faktor B: Tekstur Tanah LapisanPermukaan

FaktorB berdasarkanteksturtanahlapisanatas.

Tanah-tanahberlempungmempunyainilai paling tinggi, dantanah-tanahliat tan tanahberpasirdinilailebihrendah.

Rock fragment content is used to modify the scores, which range from 100 to 10%.

The rating for Factor B can vary as much as 30% for a specific textural class depending on the volume of coarse fragments present (Storie 1932, 1978).

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


SISR: STORIE INDEX Soil Ratings

Faktor C: Slope

FaktorC berdasarkanpadakecuramanlereng. Lahan yang hampirdatarhinggasedikit miring (0 - 8% slope) diberinilaitinggi, berkisar 100 - 85%.

Moderate to strongly sloping conditions (9 to 30% slopes) have scores ranging from 95 to 70%; slopes greater than 30% receive lower scores, ranging from 50 to 5% (Storie 1978).

Users choose a score in a somewhat subjective manner based on these slope classes.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


SISR: STORIE INDEX Soil Ratings

Faktor X: Drainage, Alkalinity, Fertility,

Kemasaman, Erosi, danMicrorelief

FaktorX fokuspadasifat-sifatdinamis, kondisitanahdanlandskapygmemerlukanpengelolaansecarakhusus.

Characteristics considered are drainage class, alkalinity, nutrient status, degree of acidity, wind and water erosion, and microrelief. Scoring for each characteristic in Factor X is subjective.

For example, drainage, erosion, and microrelief scores range from 100 to 10%, while fertility status and acidity scores range from 100 to 60 and 95 to 80%, respectively (Storie 1978)

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

PERKEMBANGAN MODEL

In our NASIS-based Storie Index, interpretation criteria were modeled based on soil properties traditionally incorporated into the hand-generated Storie Index (1978).

The most closely related NASIS data elements that pertained to the Storie 1978 criteria were used. Our model uses discrete and fuzzy logic functions to obtain more precise scores for the factors associated with the index.

Banyakkriteriabarudimasukkankedalam Model, danfaktorlainnyadimodifikasiuntukmenyesuaikanindeksdengan basis-data yang tersedia.

Model Storie 1978 telahmengalamibeberapamodifikasidalampenerapannyahinggasaatini.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

A system of interpretation generation using fuzzy logic was included within the database structure during NASIS development in order to develop more realistic soil interpretations.

Our model uses fuzzy rule sets to more accurately score Factors C and X. Discrete numerical scores in combination with fuzzy logic functions were used for Factors A and B.

Gelisols, Histosols, Spodosols, Oxisols, Dan Andisolstidakdapatdievaluasi, karenatanah-tanahinitidakdikenaldalamreferensiStorie 1978.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Faktor A: KelompokProfil Tanah

BanyaknyakelompokprofiltanahuntukFaktorA diubahdarisembilankelompokdalamStorie1978 menjadiempatkelompok.

KelompokprofildalamStorie1978 mengklasifikasikantanahberdasarkanderajatperkembanagannyadansifatbahaninduknya. Dalam Model revisiiniadapenggabungankelompoknprofiltanah yang kisaranskor-nyahampirsama.

Interpretive criteria implied in Storie Profile Group Factor A relied on the current taxonomic placement (USDA NRCS 1999) of the soil in NASIS. Thus, in some instances, out-of-date classifications needed to be considered (table 1).

Variations on the profile group fuzzy rating curves (slope and shape) that modify the effective rooting depth were devised to best match the original scoring in Storie 1978.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Tahappertamadalampemodelanadalahmemilahkantanah-tanah yang berkembangdaribatuaninduk (Groups VI - IX) daritanah-tanahygberkembangdaribahanaluvial(Group I - V).

Landform type, a data field stored in NASIS, was used for this initial classification.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Groups I to III of Storie 1978 were combined because they have a similar scoring range and reflect subtle differences in soil development. These soils, which are found on alluvial deposits, are scored based on the depth to root-restricting layers such as shallow phases, consolidated material, gravel lenses, and stratified layers with texture contrasts.

The scoring differences are identical in Groups I and II of Storie 1978 and are only slightly lower in Group III. For these reasons they were combined in our model. The soils of Groups I to III were identified through their classification.

Padaumumnyasemuatanah-tanahEntisols, Inceptisols, Vertisols, Aridisols, Alfisols, Mollisols, danUltisolsyang tidakmenunjukkanpeningkatankandunganliatsecaradrastisdengankedalamanatautidakmempunyailapisankeras, dimasukkandalam Model.

A “more is better” fuzzy rating was applied to these profiles in reference to depth to a restrictive layer. The curve reflects an optimal effective rooting depth where soil thicknesses that exceed 100 centimeters received a maximum score of 100.

Skor-skordikurangiberdasartkankedalamanlapisanpenghambatpertumbuhanakar.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Index Storie yang diaplikasikandalam Model NASIS

Mulai

Groups I-III

Soil Orders: Entisols,

Vertisols, Aridisols,

Alfisols, Mollisols,

Ultisols, Inceptisols

Groups IV

Soil with

abrupt clay

increase: “Pale”

Groups V

Soil with

cemented layers:

PetrocalcicDuripan

Fans, terraces,

and flood plains

Factor A

Soil profile group

(see figure 2 and table 1)

Landform

Scores determined by effective soil depth using fuzzy rule

Groups VII-IX

Soil depth:

Fuzzy rule -

“more is better”

Soil orders not rated:

Histosols, Gelisols, Spodosols,

Oxisols, and Andisols

Uplands

X

Fuzzy rule - “less is better”

for surface coarse fragments

(see figure 3)

Crisp limits for surface

textural class scores

(see table 2)

Factor B

Surface texture

X


Index Storie yang diaplikasikandalam Model NASIS

X

Fuzzy rule - “less is better”

Slope 0-100%

(see figure 4)

Factor C

Slope

X

Hydrology and

Physical properties

X

Chemistry and fertility

Factor X

Dynamic properties

Growing season

wetness - “less

is better”

(see figure 6)

Flooding -

fuzzy rule

“less is better”

(see figure 7

and table 5)

Erosion -

crisp limits

(see table 4)

Drainage -

crisp limits

(see table 3)

EC -

fuzzy rule

“less is better”

(see figure 5b)

SAR -

fuzzy rule

“less is better”

(see figure 5b)

pH -

fuzzy rule

“optimum”

(see figure 5a)


Rivised SISR: STORIE INDEX Soil Ratings

KonsepawaltentangProfilKelompok IV dalamStorie1978 tetapdigunakandalam Model ini.

Soils in this group are found on older plains and terraces and have dense, clay-rich subsoils that restrict the movement of water and roots. Soils in this group were identified in NASIS based on Soil Taxonomy (USDA NRCS 1999).

All soils with the formative element “pale” at the great group level were included. In addition, Albaqualfs and Albaquults were included. The upper limit of the scoring range for Profile Group IV in Storie 1978 was initially assigned, then modified by effective soil depth.

Misalnya, tanahPalexeralf(tanahdenganlapisancadasliat) dengankedalamancadasliatkurangdari 1 foot semestinyaakanmendapatnilai 85. Skorinikemudiandirevisiberdasarkan “kedalaman yang tepat” hinggahorison (lapisan) penghambatakar.

Hal inimenghasilkanskorFaktor A yang lebihrendahuntuktanahPalexeralf(~35) berdasarkantebalnyalapisantanahdiataslapisancadasliat.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Konsep original KelompoikProfilV tetapdipertahankandalam Model ini. Tanah-tanahdalamkelompokiniditemukanpadakipasdanterrastua , danmempunyai subsoil yang padatdankeras, sehinggamembatasipergerakan air danpertumbuhanakar.

SemuatanahdengananasirformatifDuri, Petro, Fragi, Petra, danPlinth yang munculpadatingkat great-group jugadimasukkandalam model. SemuatanahDuridsygdiklasifikasikanpadatingkat suborder dantanah-tanahDuricatauPetrogypsicpadatingkat subgroup jugadimasukkandalam Model.

The upper limit of the scoring range for Profile Group V in Storie 1978 was initially assigned.

A fuzzy logic rule “more is better,” in reference to depth to the cemented pan, was then used to revise the upper limit of the score based on the exact depth (the representative value for depth in NASIS) to the restrictive horizon.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Formative elements of restrictive horizons are not used at the great group level in Soil Taxonomy (1999) where the upper boundary of the layer is greater than 1 meter below the surface. In such cases, the depth to these layers is populated in NASIS as a component restriction in the database.

A “flag” was placed in the model so that when the component restriction attribute is populated the soil is placed in its appropriate profile group and scored accordingly.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Group VI dalamsistemStorie1978 dihilangkankarenakesamaannyadengan Group IV.

Group VII hingga IX dalamStorie1978 digabungkankarenamerekamempunyaikesamaankisaranskorberdasarkankedalamanperakaran. Kelompokinimencerminkantanah-tanahdenganbahaninduk residuum dancolluvium.

The fuzzy logic rule “more is better,” in reference to depth to lithic or paralithic contact, was used to modify the score based on the rooting depth.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Faktor B: Teksturlapisanpermukaan

Nilai-nilai Crisp ditetapkanuntukkelasteksturtanahlapisanpermukaansesuaidenganStorie1978 (Table 2).

The following textures were not listed in Storie 1978: very fine sandy loam, sandy clay, loamy coarse sand, loamy fine sand, loamy very fine sand, and silt.

These missing textural classes were assigned ratings in our model (Table 2). At the present time, the NASIS model does not rank organic horizons.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Faktor B: Teksturlapisanpermukaan

Semuaskorkelasteksturtanahdimodifikasiberdasarkankandungannyafragmenbatuandenganmenerapkanaturanlogika- fuzzy “less is better”.

The slope of line segments differed based on three coarse fragment volume classes: less than 15%, 15 to 35%, and greater than or equal to 35%.

The fuzzy score for rock fragment content was then used to weight the surface soil textural class score for Factor B.

For example, a silt loam with 5% rock fragments received a score of 100%, while a very gravelly silt loam with 40% rock fragments received a score of approximately 60%, that is, it was weighted proportionally to the volume of coarse fragments present.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

FaktorC: Slope

The scoring threshold values for slope classes established in Storie 1978 were used to append the fuzzy logic rule “less is better” to produce a unique score for any representative value of slope stored in

NASIS.

Fungsiinimengurangisubyektivitasygberhubungandenganpemilihansuatuskordarikisaranskor-skordidalamsetiapfaktor.

MisalnyadalamStorie 1978 :

FaktorC (slope) mempunyaikategori slope denganskor yang berkisardari 100% (“nearly level”) hingga 5% (“very steep”).

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Faktor X: Sifat-sifat yang Dinamik

Data elements stored in NASIS that pertain to Factor X (renamed “Dynamic Properties” in our model) were combined into two groups: chemical and fertility properties (Xcf); and hydrologic and physical conditions (Xhp).

Soil chemical and fertility limitations were established for pH, electrical conductivity (EC), and sodium adsorption ratio (SAR).

Hydrologic and physical conditions were assessed using drainage class, flooding frequency, flooding duration during the growing season, saturated conditions during the growing season, and erosion class. The Factor X score was calculated as the product of the lowest score in each subfactor group (Xcf and Xhp).

Dalam Model ini, hanyadigunakanduasifatdinamis yang paling membatasiuntukperhitunganFaktor X.

Xcf x Xhp = FaktorX

dimana:

Xcf : Skorterendahdarisubfaktorkimiadankesuburan

Xhp : Skorterendahsubfaktorkondisihydrologisdanfisika.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

KondisikimiawipadaFaktor X yang telahdirevisiagakberbedadenganfaktor X dalamStorie 1978.

In order to obtain more quantitative indices for chemical conditions in soil, thresholds in toxicity or osmotic effects were established for electrical conductivity (EC) and pH to reflect conditions that adversely affect plant growth, as well as for sodium adsorption ratio (SAR) to reflect conditions that affect soil dispersion and water movement.

Tanah-tanahmendapatkannilai 100% hinggatercapaitingkat sub-optimal.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Fuzzy rule sets were implemented in NASIS to model the magnitude of the impairment.

For example, an optimal curve was used to score pH through a trapezoidal pH optimal curve reflecting extremes in alkalinity and acidity. Scores of 100% were given to pH values ranging from 5.5 to 8.5.

A “less is better” curve was used to score SAR and EC.

Scores begin to decrease with SAR values that exceed 7.

Soil Taxonomy (1999) uses SAR greater than or equal to 13 to indicate Na-affected soils, but other research has shown that soil water movement can be affected by Na dispersion at SAR as low as 5 (Shainberg et al. 1981).

Scores begin to decrease when EC is greater than 1 and then decrease sharply when the threshold for saline soils (EC ≥ 4 dSm-1 ) is surpassed (Regional Salinity Laboratory Staff 1954).

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Crisp scores were assigned to certain soil physical properties because many are interpretations reported as classes rather than measured continuous variables. Scores for drainage class and erosion class were derived using crisp values (Tables 3 and 4).

Scores for a particular erosion class were higher for uplands because slope is a component of the erosion class. Also, because slope was already considered in Factor C, these scores were adjusted to avoid penalizing the site twice for the same condition.

Uplands versus lowlands were identified in NASIS based on landform type and scored separately.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Tanah jenuh air, frekuensibanjir, dandurasibanjirberpengaruhburukterhadappertumbuhantanamankalauterjadiselamamusimpertumbuhantanaman.

Lamanyamusimpertumbuhanditentukanberdasarkanregimsuhutanah. Tanah-tanahdneganresimsuhucryic, pergelic, atauisofrigidmempunyaimusimpertumbuhanlebihpendek, July danAugust.

Soils with frigid or mesic temperature regimes were given a growing a season from May to September, while thermic temperature regimes were given a growing season from March to October.

Isomesic and hyperthermic regimes were given growing seasons that extended 11 months of the year, from February through December.

Isothermic and isohyperthermic temperature regimes had year-round growing seasons.

The minimum depth to saturated conditions encountered during the growing season was derived from the fuzzy logic curve “more is better” (fig. 6).

Flooding (duration and frequency) was also assessed according to these defined growing seasons.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


RIVISED SISR: STORIE INDEX SOIL RATINGS

Interpretasisurveitanahttgkelasfrekuensibanjirdankelasdurasibanjirdigunakanuntukmendeskripsikandampakkejadianbanjirygterjadiselamamusimpertumbuhantanaman.

Flooding frequency is an estimate of the number of flood events that occur in a month. Flooding duration is the length of time flood waters reside on a particular site. Scores were established for flooding duration and frequency classes that are reported in NASIS.

The scores for a particular flooding duration class and flooding frequency class were then multiplied to get a flooding frequency and duration factor for the growing season.

Hubungan linear digunakanuntukmerevisiskorbagi sub-faktorini.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

KeuntunganPendekatanPemodelanIndeksStorie

IndeksStorie yang direvisimencerminkanpenyempurnaandarisistemklasifikasi 1978.

Indeks yang dihitungdengan Model NASIS inisnagatcepat, tidak bias, danakuratuntukmenilaipotensiproduktivitaslahandidaerahsurvei. It is capable of generating hundreds of Storie ratings in seconds for SSURGO II datasets.

The NASIS model is a data-driven tool that reduces the subjectivity of the hand-generated Storie Index and improves the reliability of these ratings, which may guide land use policy for the future.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

KeuntunganPendekatanPemodelanIndeksStorie

Model iniberbedadenganStorie1978 karenabeberapasifattanahdanlandskapdisimpandalam basis-data NASIS. Perubahanjugadilakukanuntukmeningkatkanobjektivitasskoring.

For Factor A, profile groups were condensed from nine in Storie 1978 to four because the range in scores was similar in some groups (Profile Groups I to III and VII to IX).

We also eliminated Profile Group VI in Storie 1978 because of its similarity to Group IV.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX SOIL RATINGS

KeuntunganPendekatan Modeling IndeksStorie

ModifikasidilakukanpadaFaktor X, yang disebut “FaktorDinamik.” Dalam Model Storie 1978 digunakankondisi-alkali, tetapidalamk Model inidigunakannilai-nilai EC danSAR untukmencerminkankondisi-kondisi saline, sodik, dansaline- sodik.

An assessment of nutrient status was not attempted in our model because fertility can be a very dynamic property in agricultural settings, depending on fertilization practices and other variables.

Flooding frequency and duration of saturation during the growing season were added to Factor X because of their importance in assessing land capability. Microrelief was not used in our model because it is often not populated in NASIS (especially in older surveys) and because land leveling has altered most agricultural land that once contained microrelief

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Kurva rating linear untukinteraksibanjir, dihitungfenganmenggunakanskorfrekuensibanjirdanskorlamanya (durasi) banjir, sbb:

Flooding interaction =

(frequency class/100) x (duration class/100).

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 5. Subfactor scores for Factor X, flooding frequency* and duration during the growing season.

Note: Flooding frequency and duration classes are defined in the National Soil Survey Handbook (USDA NRCS 2007).

KelasFrekuensiBanjirSkorKelasDurasiBanjirSkor

None 100 None 100

very rare 100 extremely brief 100

Rare 90 very brief 100

Occasional 85 brief 95

Frequent 70 long 85

very frequent 60 very long 75

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 6.

“Optimal: more is better” fuzzy rating curve for Factor X, depth to saturation during the growing season.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 4.

SkorSubfaktoruntukFaktor X, KelasErosi.

(Erosion ratings were different for uplands versus lowlands because slope is a dominant variable impacting erosion class ratings in uplands.)

KelasErosiSkore Lowland Skore Upland

0 100 100

1 80 95

2 60 85

3 40 75

4 20 65

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Tabel 3. SkorSubfaktoruntukFaktor X, Kelas Drainage

Kelas Drainage Skor

Excessively drained and

Somewhat excessively drained 85

Well drained 100

Moderately well drained 90

Somewhat poorly drained 70

Poorly drained and very poorly drained 50

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS (Note: Landform type, a field stored in NASIS, was first used to separate alluvial soils (Groups I to V) from upland soils (Groups VI to IX). Soil Taxonomy (USDA NRCS 1999) was used to place the soil in one of four new groups. Histosols (peat soils), Gelisols (soils with permafrost), Oxisols (highly weathered tropical soils), Andisols (volcanic soils), and Spodosols (cool humid forest soils) were not rated.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Tabel 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Table 1. Faktor A, penyebutankelompokprofiltanahmelalui data taxonomiygdisimpandalam NASIS

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 2. Fuzzy logic rating functions “more is better” to define the effective soil depth in Factor A, soil profile group.

A: A rating curve for Profile Groups I–III.

B: A rating curve for Profile Group IV describing the depth to an abrupt texture change.

C: A rating curve for Profile Group V depth to a cemented pan.

D: A rating curve for Profile Groups VII–IX describing the depth to bedrock

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Tabel 2. Skorepenilaian “Crisp” untukFaktor B, Kelasteksturhorisonpermukaan

KelasTekstur Lap. PermukaanNilai

very fine sandy loam, fine sandy loam, loam, silt, silt loam 100

loamy very fine sand, sandy loam, sandy clay loam,

calcareous silty clay loam, clay loam 95

coarse sandy loam, loamy fine sand, noncalcareoussilty clay loam, clay loam 90

loamy sand, very fine sand 80

fine sand, loamy coarse sand, sandy clay 65

Pasir, LiatBerdebu 60

Liat = Clay 50

PasirKasar 30

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 3.

“Less is better” fuzzy rating curve for Factor B, surface rock fragment content.

Straight line segments represent three classes of rock fragment volume percent populated in NASIS: 0-15, 15-35 and > 35.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 4.

“Less is better” fuzzy rating curve for Factor C, slope.

Most soil scientists express slope gradient as a percent, the difference in elevation between two points as a percentage of the distance between those points.

Slope 100% setaradengansudutkemiringan 45°.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 5A.

“Optimal” fuzzy rating curve for Factor X, pH, in the surface layer.

Nilai pH optimal antara pH 5.5 dan8.5.

Kondisiekstrimterjadipadanilai pH rendah.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 5b.

“Optimal: less is better” fuzzy rating curve for Factor X, surface soil sodium adsorption ratio.

Skoremenjadilebihrendahkalaunilai SAR lebihdari 7.

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


Rivised SISR: STORIE INDEX Soil Ratings

Figure 5C.

“Optimal: less is better” fuzzy rating curve for Factor X, surface soil electrical conductivity (EC).

Skormenjadilebihrendahkalaunilai EC melebihi 1.0

Sumber: http://anrcatalog.ucdavis.edu/pdf/8335.pdf


FAKTOR A. PenilaianKarakterFisikProfil

Tanah-tanahpdakipas-aluvialmuda, dataranbanjir, ataudeposirsekunderlainnyaygbelumberkembang

Profiles …………………….100 %

X - shallow phases (on consolidated material). 2 feet deep …… 50 - 60 %

X - shallow phases (on consolidated material). 3 feet deep …… 70 %

G - extremely gravelly subsoils …… 80 - 95 %

S - stratified clay subsoils ……. 80 - 95 %

II. Tanah-tanahpadaKipas-aluvialmuda , dataranbanjir.

or other secondary deposits having slightly developed profiles …… 95 - 100 %

X - shallow phases (on consolidated material). 2 feet deep ….. 50 - 60

X - shallow phases (on consolidated material). 3 feet deep ….. 70

G - extremely gravelly subsoils ….. 80 - 95

S - stratified clay subsoils ….. 80 - 95

Sumber:


SISR: STORIE INDEX Soil Ratings

III. Tanah-tanah pd kipasaluvialtua, dataranaluvialatauterrastua, perkembanganprofilnyamoderat (subsoil agakrapat) ….. 80 - 95 %

X - shallow phases (on consolidated material). 2 feet deep ….. 40 - 60

X - shallow phases (on consolidated material). 3 feet deep ….. 60 - 70

G - extremely gravelly subsoils ….. 60 - 90

IV. Tanah-tanah pd dataranatauterrastua, profilnyasudahberkembang (subsoil liatpadat) ….. 40 - 80 %

V. Tanah-tanahpadaDataranatauTerrastuaygmempunyai subsoil cadas-keras:

padakedalamankurang 1 foot …… 5 - 20

at 1 to 2 feet ….. 20 - 30

at 2 to 3 feet ….. 30 - 40

at 3 to 4 feet ….. 40 - 50

At 4 to 6 feet ….. 50 - 80


SISR: STORIE INDEX Soil Ratings

VI. Tanah-tanahpadaterrastuadanlahankeringdengan subsoil liatpadat , bahaninduknya material paduatauagakpadu ……. 40 - 80

Tanah-tanahdilahankering yang lapisanbawahnyakeraspadakedalaman:

at less than 1 foot ….. 10 - 30

at 1 to 2 feet ….. 30 - 50

at 2 to 3 feet ….. 50 - 70

at 3 to 4 feet ….. 70 - 80

At 4 to 6 feet ….. 80 - 100

at more than 6 feet …… 100

Sumber:


SISR: STORIE INDEX Soil Ratings

Tanah-tanahdilahankering yang lapisanbawahnyabatuansedimen

at less than 1 foot ….. 10 - 30

at 1 to 2 feet ….. 30 - 50

at 2 to 3 feet ….. 50 - 70

at 3 to 4 feet ….. 70 - 80

at 4 to 6 feet ….. 80 - 100

at more than 6 feet ….. 100

Tanah-tanahdilahankeringyglapisanbawahnya material lunak

at less than 1 foot ….. 20-40

at 1 to 2 feet ….. 40 - 60

at 2 to 3 feet ….. 60 - 80

at 3 to 4 feet ….. 80 - 90

at 4 to 6 feet ….. 90 - 100

at more than 6 feet ….. 100


SISR: STORIE INDEX Soil Ratings

FAKTOR B --- Penilaianatasdasarteksturlapisanpermukaan

Tekstur Medium :

fine sandy loam ….. 100

loam ….. 100

silt loam ….. 100

Sandy loam …… 95

silty clay loam, calcareous ….. 95

Silty clay loam. noncalcareous ….. 90

clay loam. calcareous ….. 95

clay loam. noncalcareous ….. 85 - 90

TeksturBeratatauHalus:

silty clay. highly calcareous ….. 70 - 90

silty clay. noncalcareous ….. 60 - 70

clay. Highly calcareous …….. 70 - 80

clay. noncalcareous ….. 50 - 70

Sumber:


SISR: STORIE INDEX Soil Ratings

TeksturRinganatauKasar:

coarse sandy loam 90

Loamy sand 80

very fine sand 80

Fine sand 65

sand 60

Coarse sand 30-60

Sumber:







SISR: STORIE INDEX Soil Ratings

PENENTUAN GRADE TANAH

Adaenam GRADE Tanah yang dideskripsikanmenurutkisarannilaiindekssbb:

Grade 1 (excellent): Soils that rate between 80 and 100 percent and which are suitable for a wide range of crops, including alfalfa, orchard, truck, and field crops.

Grade 2 (good): Soils that rate between 60 and 79 percent and which are suitable for most crops Yields are generally good to excellent.

Grade 3 (fair): Soils that rate between 40 to 59 percent and which are generally of fair quality, with less wide range of suitability than grades 1 and 2 Soils in this grade may give good results with certain specialized crops.

Grade 4 (poor): Soils that rate between 20 to 39 percent and which have a narrow range in their agricultural possibilities For example, a few soils in this grade may be good for rice, but not good for many other uses.

Grade 5 (very poor): Soils that rate between 10 and 19 percent are of very limited use except for pasture, because of adverse conditions such as shallowness, roughness, and alkali content.

Grade 6 (nonagricultural): Soils that rate less than 10 percent include, for example, tidelands, riverwash, soils of high alkali content, and steep broken land.


SISR: STORIE INDEX Soil Ratings

Current terminology:

1/ moderately well drained2/ somewhat poorly drained3/ poorly to very poorly drained4/ salinity/sodicity5/ pH less than 50

Sumber:


SISR: STORIE INDEX Soil Ratings

Tanah-tanahdinilaiberdasarkanIndeksStorie

This index expresses numerically the relative degree of suitability, or value, of a soil for general intensive agriculture. The rating is based on soil characteristics only and is obtained by evaluating such factors as depth, texture of the surface soil, intensity of subsoil, drainage, salts and alkali, and relief.

Other factors, such as availability of water for irrigation, climate, and distance from markets that might determine the desirability of growing certain plants in a given locality are not considered. Therefore in itself the index cannot be considered as an index of land value.

The index rating is given in the "Guide to Mapping Units" section of the Eastern Fresno Soil Survey document.

Sumber:


SISR: STORIE INDEX Soil Ratings

Empatfaktor yang biasanyadigunakandalampenilaianIndeksStorie.

KeempatFaktoriniadalah (A) karakteristikprofiltanah ― terutamapermeabilitasdankedalamantanah; (B) teksturtanahpermukaan; (C) slope; dan(X) faktorataupembataslainnya, sepertiketersediaanhara, banjir, drainage, salts danalkali, erosion, danmicro-relief.

Each of these four general factors is evaluated on the basis of a “100 percent” rating.

A rating of 100 percent expresses the most favorable, or ideal condition; and lower percentage ratings are given for conditions less favorable for crop production.

Sumber:


SISR: STORIE INDEX Soil Ratings

PenilaianIndeksStorieuntuksuatutanahdiperolehdenganmengalikankeempatfaktortersebut, A, B, C, danX; sehinggasetiapfaktorikutmenentukannilaiakhir.

For example, a soil may have an excellent profile justifying a rating of 100 percent for factor A; excellent texture of the surface soil justifying 100 percent for factor B; a smooth nearly level surface justifying 100 percent for factor C, but a high accumulation of salts of alkali that would give a rating of 10 percent for factor X.

Multiplying these four ratings gives an index rating of 10 for this soil.

The high accumulation of salts or alkali would dominate in determining the quality of the soil, render it unproductive for crops, and justify the low index rating of 10 consistent with a “most-limiting factor”

Sumber:


SISR: STORIE INDEX Soil Ratings

IndeksStorie (i) untukmenilaisuatutanahmerupakanekspresinumerikygmenyatakanderajatsampaidimanakondisitanahaktualsesuaiuntukpertumbuhantanamanpadakondisilingkungan (iklim) yang baik.

DalammenghitungIndeksStorieiniadatigafaktor yang dipertimbangkan, yaitu: FaktorA, profiltanah; FaktorB, teksturlapisantanahpermukaan; danFaktorC, pemodifikasikondisitanah, seperti drainage, alkali, kemasaman, dll.

Each of these three factors is evaluated on a percentage basis, the most favorable or ideal conditions being rated as 100 percent.

The values of factors A, B, and C are then multiplied, the result being the index number.

Sumber:


SISR: STORIE INDEX Soil Ratings

The index method is a decided departure from the usual score card methods of judging and evaluating soils, in which the various soil characteristics are given values on the basis of 100 op 1000, and after rating each characteristic on this basis, the merits are added to ascertain the final rating of the soil.

With many factors to be considered, no single factor can be given very heavy weight, and complete failure in one or more features may still leave the soil rating comparatively high.

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SISR: STORIE INDEX Soil Ratings

The multiplication of factors, A, B, and C permits any one of these to completely dominate the index rating.

For illustration, a soil may be a deep recent alluvial deposit of fine sandy loam, probably as ideal in profile and texture as one could find, and rating 100 percent for factors A and B. But if it was heavily charged with alkali, its C rating might be 10 or lower.

Multiplying factors A, B, and C would give a final index value of 10, while under the score card method, where 'alkali‘ would hardly be given a value of more than 20 points, the rating would be 80 or more! Heavy accumulations of alkali would absolutely dominate the soil, rendering it valueless for any economic crop, and the index rating cf 10 or less would be justified.

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SISR: STORIE INDEX Soil Ratings

For use in California, the soil profiles, factor A, have been divided into six groups, five being made up of secondary soils and one of primary soils. In some eastern states, for instance, Pennsylvania, this distribution might be reversed.

The primary soils could there well be divided into four or five major groups, while the secondary soils could be combined into one or two, with subgroups where necessary.

The soil series within each group are given ratings whose value depends upon the character of the series profile, particularly the characteristics of the subsoils or B horizons. Profiles with deep subsoils pervious to water and roots, yet sufficiently retentive to carry crops through moderate drought periods and which are free from any stratification or other conditions that would retard plant growth are rated as 100 percent.

Profiles with dense claypansubsoils or with hardpan horizons are rated at 5 to 60 percent, depending on the density of the claypan, or the depth to the hardpan.

Primary soils are rated at from 20 to 70, depending on the character of the subsoil and the depth to bedrock.

Sumber:


SISR: STORIE INDEX Soil Ratings

The B factor evaluates the character of the surface soils, which are divided into four textural groups—light, medium, medium-heavy, and heavy textured, with two additional groups to cover the textural grades that include gravel and stone.

The B factor rates not only the soil texture, but also those other characteristics that are more or less dependent on texture, such as consistence, porosity, permeability and tilth. These factors determine the response of the soil to tillage operations, the rate of water absorption, the characteristics of the seedbeds and other features that are vital in agricultural work.

Fine sandy loams, loams, and silt loams are considered ideal and are rated as 100, while heavy clays rate from 50 to 70. Stony sands may rate as low as 10 percent. The applications of this index method in other states and under other climatic conditions might require some rearrangement of the values assigned to factor B.

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SISR: STORIE INDEX Soil Ratings

Factor C was found to be most difficult. It is intended to cover those modifying conditions that are fundamentally related to the soil, or are inherent in the soil itself.

Among these are conditions of excessive alkalinity or acidity of the soil, marked infertility, conditions of poor drainage, shallow, steep, or eroded phases untypical of the soil type, and the like.

Most of these conditions are usually reflected in the soil profile and are considered in the values assigned under factor A. But the degree of intensity of those conditions, or their irregular occurrence may not be expressed in the A or B factors, hence the introduction of this C factor to cover such conditions whenever they exist in sufficient degree as to modify the soil-plant relationships.

Factors A and B essentially evaluate the Soil Type, factor A covering the series characteristics and particularly those of the subsoils or B horizons, while factor B covers the surface soils or the A horizons.

In most locations the third modifying factor C does not appear in the evaluation.

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SISR: STORIE INDEX Soil Ratings

MetodeIndeksStoriebertumpupadainformasi yang dikumpulkandalamsurveitanah, dansangatmudahdilakukankalausurveitanahtelahdiselesaikan. Kalautidakadasurveitanahmakaharusdilakukanpengambilancontohtanahlapisanatas (topsoil) dantanahlapisanbawah (subsoil).

Obviously, it is not possible to properly evaluate, assess or appraise the soil without knowing the facts regarding the soil characteristics, either through the use of the soil maps, or by actual soil exploration. Guesses as to soil conditions, based on a look at growing crops or native cover, are usually very unreliable and often misleading.

For Federal Land Bank loans, which may run 20 to 35 years, the soil factor must be properly evaluated in making the land appraisals.

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SISR: STORIE INDEX Soil Ratings

The Storie Index method is being used in California by the assessors in several counties and by appraisers for the Federal Land Bank and other financial institutions.

In the Imperial Valley, where the climate, water supply, transportation, markets, and conditions other than those inherent in the soil are all quite uniform, the index rating becomes essentially a land evaluation.

In Riverside County, where the availability and quality of irrigation water determines whether or not the land can be used at all and where such influences as micro-climate (with variations of only a few degrees in minimum winter temperatures) may determine whether or not citrus fruits can be produced on a given site, the soil factor becomes only one of many factors that must be considered in arriving at the land evaluation.

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STORIE INDEX

The soils in the area, primarily used for cropland, in the Sacramento Valley, and rangeland, in the Coast Range foothills, are rated in Table 10a according to the Storie index (Storie, 1933; 1976).

The soils in the higher Coast Range, primarily used for timberland, are in Table 10b according to the Storie index (Storie, 1948).

These indexes express numerically the relative degree of suitability of a soil for general intensive agricultural uses or timber uses at the time of the evaluation.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

Index for cropland and rangeland

The rating is based on soil characteristics and is obtained by evaluating soil surface and subsurface chemical and physical properties, as well as landscape surface features. The original "Soil-Rating Chart" (Storie 1976).

Some of the terminology used in this chart is not used today. However, when the ratings were developed, they were compared to today’s terminology to create the most logical estimate for the rating.

Not considered in the rating are availability of water for irrigation, local climate, size and accessibility of mapped areas, distance to markets and other factors that might determine the desirability of growing certain plants in a given locality. Therefore, the index should not be used as the only indicator of land value.

Where the local economic and geographic factors are known to the user, however, the Storie index may provide additional objective information for land tract value comparisons.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

INDEKS UNTUK LAHAN PERTANIAN & GEMBALAAN

EmpatfaktorygdigunakanuntukmenentukannilaiIndeks:

Permeabilitastanah, available water capacity, and depth of the soil

Teksturtanahlapisanpermukaan

Slope dominandaritubuhtanah

Kondisilainnya Other conditions more readily subject to management or modification by the land user.

In this area these conditions include drainage and flooding, salinity and alkalinity, fertility, acidity, erosion, and microrelief.

For some soils, more than one of these X conditions are used in determining the rating.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

INDEKS UNTUK LAHAN PERTANIAN

A rating of 100 percent expresses the most favorable, or ideal, condition for general crop production. Lower percentage ratings are assigned for less favorable conditions or characteristics. Factor ratings, in percentages, are selected from tables prepared from data and yields. Certain properties are assigned a range of values to allow for variations in the properties to plant growth and crop yields. Certain properties are assigned a range of values to allow for variations in the properties that affect the suitability of the soil for general agricultural purposes.

The index rating for a soil component of a map unit is obtained by multiplying the percentage rating values given to its four factors, A, B, C, and X.

If more than one condition is recognized for the X factor for a soil, the value for each condition acts as a multiplier. Therefore any of the general factors or X factors conditions may dominate or control the final rating.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

IndeksUntukLahanTanamandanLahanGembalaan

If a map unit consists primarily of one named soil series (a consociation), the index rating for the named soil component equals the index rating for the map unit. If a map unit consists of more than one named component (a complex), ratings are assigned to each named component (soil series or miscellaneous area, such as "Rock outcrop"). Inclusions of other soils or minor components not named in the map unit name, are not used in the calculations.

Map units are assigned grades according to their suitability for general intensive agriculture as shown by their Storie index ratings. The six grades and their range in index ratings are:

Grade 1—80 to 100 Grade 2—60 to 79 Grade 3—40 to 59 Grade 4—20 to 39 Grade 5—10 to 19 Grade 6—less than 10

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

INDEKS UNTUK LAHAN PERTANIAN

Grade 1 are well suited to intensively cultivated crops that are climatically adapted to the region.

Grade 2 soils are good agricultural soils, although they are not so desirable as soils in grade 1 because of a less permeable subsoil, deep cemented layers (e.g., duripans), a gravelly or moderately fine textured surface layer, moderate or strong slopes, restricted drainage, low available water capacity, lower soil fertility, or a slight or moderate hazard of flooding.

Grade 3 soils are only fairly well suited to agriculture because of moderate soil depth; moderate to steep slopes, restricted permeability in the subsoil; a clayey, sandy, or gravelly surface layer; somewhat restricted drainage; acidity; low fertility; or a hazard of flooding.

Grade 4 soils are poorly suited to agriculture. They are more limited in their agricultural potential than the soils in grade 3 because of restrictions, such as a shallower depth; steeper slopes; poorer drainage; a less permeable subsoil; a gravelly, sandy, or clayey surface layer; channeled or hummocky microrelief; acidity.

Grade 5 soils are very poorly suited to agriculture and are seldom cultivated. They are more commonly used as pasture, rangeland, or woodland.

Grade 6 soils and miscellaneous areas are not suited to agriculture because of very severe or extreme limitations. They are better suited to limited use as rangeland, protective habitat, woodland, or watershed.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

INDEKS UNTUK LAHAN HUTAN

The rating is based on soil characteristics and is obtained by evaluating soil surface and subsurface chemical and physical properties, as well as climatic features. The original "Timber Soil Rating Chart" (Storie 1948).

Some of the terminology used in this chart is not used today. However, when the ratings were developed, they were compared to today’s terminology to create the most logical estimate for the rating.

Not considered in the rating are size and accessibility of mapped areas, distance to markets and other factors that might determine the desirability of timber production in a given locality. Therefore, the index should not be used as the only indicator of timber production. Where the local economic and geographic factors are known to the user, however, the Storie index may provide additional objective information for timber production.

Lima faktorygdigunakanuntukmenentukannilaiindeks :

Kedalaman Tanah danTeksturtanah

Permeabilitas Tanah

Karakteristik Kimia Tanah.

Drainage dan runoff.

Iklim.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

INDEKS UNTUK LAHAN HUTAN

The index rating for a soil component of a map unit is obtained by multiplying the percentage rating values given to its four factors, A, B, C, D, and E.

If a map unit consists primarily of one named soil series (a consociation), the index rating for the named soil component equals the index rating for the map unit. If a map unit consists of more than one named component (a complex), ratings are assigned to each named component, except rock out crop. Miscellaneous areas are considered to be unsuited for timber production, and are not rated or considered zero. Inclusions of other soils or minor components not named in the map unit name, are not used in the calculations.

Timber site ratings in percent were assigned adjective ratings according to their suitability for general intensive timber production as shown by figure 1 "Relationship Between Timber Site Rating and Height - Age Index" in the appendices showing the "Timber Soil Rating".

The five ratings and their range in index ratings are:

Redwood—100 to 120 High—85 to 99 Medium—50 to 84 Low—30 to 49 Non-Timber—0 to 29

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/storie.html


STORIE INDEX

KELAS

KAPABILITAS TANAH



TIMBER SOIL RATINGS

Studilapangandimulaitahun 1947 untukmenganalisishubunganantaratanah, iklimdankualitaslokasihutantanaman (timber).

Empatfaktortanahdisimpulkanmempengaruhiataumembatasipertumbuhanjenis conifers diCalifornia. Keempatfaktoriniadalah A – Kedalamantanahdanteksturtanah; B – Permeabilitastanah; C – Karakteristikkimiatanah; D - Drainage dan runoff. Selainitujugaadafaktoriklim.

High sites for growing conifers in California need a deep soil of sufficiently fine textured to hold about 12% of more of moisture; a permeable profile; have no toxic chemical characteristics; be of acid reaction; well drained; and have a total annual rainfall of more than 40 inches.

Hasilpenilaianpendahuluanberdasarkanpenetapannilaipersentaseuntuk lima faktor : A – Kedalamantanahdantekstur; B – permeabilitastanah; C – sifatkimiatanah; D - Drainage dan runoff; E - Iklim.

Four climatic zones are considered in rating the timber sites in the Sierra Nevada and Coast Range Mountains of California and Nevada.

Timber Site Rating = A x B x C x D x E.

Sumber: http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/appendixc_b.html


TIMBER SOIL RATINGS

Timber Soil Rating Chart

IndeksuntukmenilaikesesuaiantanahuntukHutanTanamanKayudiCalifornia

FaktorA: Depth-Texture (tidakadaefekpenilaianuntukteksturdengankapasitas air tersedia 12% ataulebih.)

Sumber:


TIMBER SOIL RATINGS

FaktorB: Permeabilitas Tanah

Sumber:


TIMBER SOIL RATINGS

FaktorC: Kimia Tanah (Alkalinity, Salinity, dll.)

Sumber:


TIMBER SOIL RATINGS

FaktorD: Drainage-Runoff

Sumber:


TIMBER SOIL RATINGS

FaktorE: Iklim

Sumber:


TIMBER SOIL RATINGS

PentingnyaKlasifikasi Tanah danPenilaian Tanah bagiLokasiHutan Timber

Klasifikasitanahbersamadengannilaitanahuntukkualitaslokasihutantanaman (timber) akanmemperkuatsurveisumberdayahutandi California melaluiduacara:

First it will facilitate and improve the quality of the timber site classification. Previously this classification has been base entirely on the height-age relationship of dominant trees without reference to the soil. Ratings were satisfactorily made where dominants were present, as in the case of virgin timber or older second growth.

On the other hand difficulties were encountered in making reliable ratings in many cut-over or burned-over areas where suitable dominants were infrequent or entirely absent.

Sumber:


TIMBER SOIL RATINGS

PentingnyaKlasifikasi Tanah danPenilaian Tanah bagiLokasiHutan Timber

Di beberapalokasi, dimanatidakadapertumbuhantegakankayu timber, makatidakdapatditentukanapakahlokasiitusesuaiuntukhutantanamankayu timber.

Kesulitaninidicobadiatasidenganjalanmenilailokasitersebutberdasarkankualitastanahnya.

Second, the maps produced by the survey, since they show the location of good, fair, poor, and unsuitable sites for growing various kinds of timber trees, will have greater usefulness to those interested in managing forest lands for timber crops.

Sumber:


TIMBER SOIL RATINGS

Hubunganantara Rating TapakHutandenganIndekstinggi-umur

Sumber : http://lawr.ucdavis.edu/classes/ssc118/Colusa_County/appendixc_b.html


STORIE INDEX OF SOILS

Sumber: STELA – April 2013


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