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T12+Slides - Mt Ruapehu New Zealand Crater Lake pH 2...

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1 Mt. Ruapehu, New Zealand Crater Lake pH 2 What is soil acidity/pH? What controls soil pH? How does pH affect soil quality? How can you remediate adverse soil pH? H 2 O = HOH = H + + OH - H + = Acid OH - = Base pH = -log ( H + ) Acidity/Basicity refers to the balance between H + and OH - pH of unpolluted rainfall = 5.6 Acid H + pH < 7 Base OH - pH > 7 Neutral pH = 7 Testing Soil pH Sources of Acid in Soils CO 2 - root and microbial respiration Organic acids - roots and microbes Acid rain – humans (nitric & sulfuric) Ammonium fertilizers NH 4 H + + NO 3 + energy Sources of Bases in Soils Chemical weathering reactions (Hydrolysis) K-feldspar + H 2 O  H-feldspar + K + + OH - Irrigation water may have OH - > H + (pH > 7) Additions of lime CaCO 3 + H 2 O  Ca 2+ + HCO 3 - + OH -
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2 Acid Soils High rainfall and leaching Basic Soils Low rainfall and leaching What controls the pH of soil in nature? pH = 4.7 pH = 8.5 Time C A-C A-B-C A–many B Neutral (pH=7) Slightly acidic (pH=6-6.5) Moderately acidic (pH=5-6) Soil pH is California is
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