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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/


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

pH = -log [H+]

[H+] activity


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pH

< .

. - .

. - .

. - .

. - .

. - .

>.0


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.

CO2 + H2O = H2CO3

H2CO3 = H+ + HCO3-

HCO3- = H+ + CO32-

/


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.

HNO3 H2SO4 pH


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.

(NH4)2SO4 K2SO4 NH4Cl


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.

pyrite (FeS2)

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


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Acid sulfate soil


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.


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.

Ca2+

K+

Mg2+

H+

NH4+


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2

  • active acidity

  • potential acidity


A ctive acidity

Active acidity

H+ pH


Potential acidity

potential acidity

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


Potential acidity1

potential acidity

potential acidity

Al3+ + H2O = AlOH2+ + H+

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

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


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.


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.


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(liming matterial)


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(lime requirement LR)

LR pH pH pH . - .


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CaCO3

LR pH . = kg-CaCO3/

pH . CaCO3 kg/


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


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CaO + 2H+ = Ca2+ + H2O

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

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


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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


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Ca(OH)2 74 CaCO3 100

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

Ca(OH)2 neutralizing value = 135


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LR = 450 kg-CaCO3/


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neutralizing value

CaCO3

CaO

Ca(OH)2

CaCO3

CaCO3.MgCO3


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. Ca Mg

.

.


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  • .

  • .


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  • . Ca

  • .


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  • . Fe Mn

  • .

  • .


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kg/ kg/ kg/


Soil salinity

(soil salinity)


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