Lecture 21 Soil Buffering and Management of Acid Soils

Lecture 21 Soil Buffering and Management of Acid Soils -...

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1 Soil Buffering and Soil Buffering and Management of Acid Soils Management of Acid Soils 1. Acids increase the H+ ion concentration in solution 2. Bases are the opposite of acids 3. Bases neutralize acids. 4. When acids and bases are in equal amounts in a solution, the pH is 7. Neutral pH. 5. When the number of acids exceeds the number of bases the pH is lowered. (acid conditions) 6. When the number of bases exceeds the number of acids, the pH is raised. (basic/alkaline conditions) H + OH - H + H + H + H + H + H + H + H + H + OH - OH - OH - OH - OH - Acid (=10) Base (=6) 0 7 14 Acidic basic H + OH - H 2 O +
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2 H + OH - H + H + H + H + H + H + H + H + H + OH - OH - OH - OH - OH - OH - OH - OH - OH - Acid (=10) Base(=10) 0 7 14 Acidic basic H + OH - H 2 O + H + OH - H + H + H + H + H + H + H + H + H + OH - OH - OH - OH - OH - OH - OH - OH - OH - Acid (=10) Base(=15) 0 7 14 Acidic basic H + OH - H 2 O + OH - OH - OH - OH - OH - Two types of acidity in soils: Active Acidity Exchangeable Acidity
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3 Active Acidity Acidity associated with the soil solution Typically a 1:1 or 2:1 extract 10 g soil and 10 mL water 10 g soil and 20 mL water Exchangeable Acidity Acidity associated with cation exchange sites on mineral or organic colloids. Si
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Lecture 21 Soil Buffering and Management of Acid Soils -...

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