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Bahan Kajian MK. Dasar Ilmu Tanah. KTK & KETERSEDIAAN HARA. Smno.agroekotek.fpub.nop2013. Kapasitas Tukar Kation (KTK). Clay Particles dan Humus affect chemical properties of soil complex structures with many negative charge sites

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bahan kajian mk dasar ilmu tanah

BahanKajian MK. DasarIlmu Tanah





kapasitas tukar kation ktk
KapasitasTukarKation (KTK)

Clay Particles danHumus

  • affect chemical properties of soil
  • complex structures with many negative charge sites
  • negative charge sites attract positive ions called cations
kapasitas tukar kation ktk1
KapasitasTukarKation (KTK)

Negative charge sites are referred to as . . .

Cationexchange sites

attract cations from soil solution


Kapasitas Tukar Kation (KTK)

Force of attraction is called:


similar to force of a magnet holding iron filings.


Kapasitas Tukar Kation (KTK)

Cations can move on and off particles . . .

when one leaves, another replaces it

This process is called cation exchange, and cations involved are said to be exchangeable


Kapasitas Tukar Kation (KTK)

The number of sites that a colloid (small particle) of charged clay or humus (micelles) contains is measured by the:

Cation Exchange Capacity expressed in mEq/100g (older unit) or cmolc/kg


Kapasitas Tukar Kation (KTK)

may range from:

2.0 mEq/100g for sand


> 50 mEq/100g for some clays


humus 100-300 mEq/100g

under certain soil conditions


Kapasitas Tukar Kation (KTK)

How fertile can a soil be?

Does applying more fertilizer always provide more nutrients to plants?

How much of the CEC is actually filled with cations?


Kapasitas Tukar Kation (KTK)

The proportion of the CEC occupied by basic (+) nutrients such as Ca, Mg, K, Na, is called:

Percent Base Saturation and is an indication of the potential CEC of a given soil


Kapasitas Tukar Kation (KTK)

Estimations that > 99% of cations in soil solution are adsorbed . . .

does not mean that percent base saturation is 99%

Exchangeable nutrient cations adsorbed on soil particles exist in equilibrium with cations in the soil solution. Cations from the particles replenish those taken up from the soil solution by plants.


kapasitas tukar kation ktk2
KapasitasTukarKation (KTK)


A soil with CEC of 10 mEq/100g has 6 mEq/100g of bases (Ca, Mg, K, Na) occupying exchange sites

What is the percent base saturation of the soil?

kapasitas tukar kation ktk3
KapasitasTukarKation (KTK)

6 mEq/100g bases

10 mEq/100g sites

= 60 % base saturation

kapasitas tukar kation ktk4
KapasitasTukarKation (KTK)

Cation Exchange is determined by:

1) strength of adsorption

2) law of mass

kapasitas tukar kation ktk5
KapasitasTukarKation (KTK)

Strength of adsorption is as follows:

H+ and Al3+ > Ca2+ > Mg2+ > K+ > NH4+ > Na+

kapasitas tukar kation ktk6
KapasitasTukarKation (KTK)

Law of Mass

the more of one ion available,

the greater the chance of adsorption

unsur hara tanaman
Unsur Hara Tanaman

There are at least 17 elements recognized as essential nutrients for plants;

we will recognize 18 elements:

C, H, O, P, K, N, S, Ca, Fe, Mg,

Mn, Mo, Cl, Cu, Zn, B, Co, Ni

unsur hara tanaman1
Unsur Hara Tanaman

Nutrients grouped into 2 categories according to the relative amount used by plants:

Macronutrients – major elements; large amounts

Micronutrients – minor elements; small amounts

Both are essential for optimal plant production


Penyerapan Hara olehBuluAkar


Unsur Hara Tanaman

Except for C, H, O . . .

- Nitrogen (N) is present in greatest concentrations;

- Plants respond readily to Nitrogen (N)