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ความเป็นกรดเป็นด่างของดิน PowerPoint PPT Presentation


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ความเป็นกรดเป็นด่างของดิน. บรรยายโดย ผศ.ดร. สมศักดิ์ มณีพงศ์ ห้องทำงาน : อาคารวิชาการ 4 ห้อง 224 Website : http://www.wu.ac.th/ cai /msomsak/. ความเป็นกรดเป็นด่างของดิน.

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: 4 224

Website : http://www.wu.ac.th/cai/msomsak/


(soil reaction) H+ OH- pH (power of hydrogen ion)

pH = -log [H+]

[H+] activity


pH

< .

. - .

. - .

. - .

. - .

. - .

>.0


.

CO2 + H2O = H2CO3

H2CO3 = H+ + HCO3-

HCO3- = H+ + CO32-

/


.

HNO3 H2SO4 pH


.

(NH4)2SO4 K2SO4 NH4Cl


.

pyrite (FeS2)

4FeS2 + 15O2 + 14H2O =4Fe(OH)3 + 8H2SO4


Acid sulfate soil


.





.

Ca2+

K+

Mg2+

H+

NH4+


2

  • active acidity

  • potential acidity


Active acidity

H+ pH


potential acidity

H+ H+ hydrolysis acidic cation ( H+ Fe2+ Fe3+ Al3+ )


potential acidity

potential acidity

Al3+ + H2O = AlOH2+ + H+

AlOH2+ + H2O = Al(OH)2+ + H+

Al(OH)2+ + H2O = Al(OH)3 + H+





.


.


(liming matterial)



(lime requirement LR)

LR pH pH pH . - .


CaCO3

LR pH . = kg-CaCO3/

pH . CaCO3 kg/


(neutralizing value) lime equivalent value calcium carbonate equivalent value CaCO3


CaO + 2H+ = Ca2+ + H2O

Ca(OH)2 + 2H+ = Ca2+ + 2H2O

CaCO3 + 2H+ = Ca2+ + H2O + CO2


neutralizing value Ca(OH)2

Ca(OH)2 = 40 + (16 x 2) + (1 x 2)

= 74 /

CaCO3 = 40 + 12 + (16 x 3)

= 100 /

Ca(OH)2 1 CaCO3 1

Ca(OH)2 74 CaCO3 100


Ca(OH)2 74 CaCO3 100

Ca(OH)2 100 CaCO3 100 x (100/74)

Ca(OH)2 neutralizing value = 135


LR = 450 kg-CaCO3/


neutralizing value

CaCO3

CaO

Ca(OH)2

CaCO3

CaCO3.MgCO3




. Ca Mg

.

.


  • .

  • .


  • . Ca

  • .


  • . Fe Mn

  • .

  • .


kg/ kg/ kg/


(soil salinity)


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