AGR 2320 Lecture Notes - Lecture 32: Cation-Exchange Capacity, Calcite, Wood Ash

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Soil ph agr 2320 tuesday november 21, 2017: ph= -log (h+, carbon dioxide and carbonic acid are always in equilibrium, natural rainfall has a slightly acidic ph. Acid precipitation (not as large as an issue in north america) Ammonium is a decomposition, but when in the soil it becomes an oxidizing agent. Aluminum toxicity (ph=5. 7) (reduces root elongation and stops nodule formation) more hydrogen in soil water oh group leaves, elemental aluminum is left. Calcium and magnesium deficiency (primarily made from calcium magnesium carbonate< this has been weathered out) Molybdenum deficiency (anion rxct with cations, more cations in soil) Manganese toxicity (has ph drops in soil profile) *elemental aluminum starts to be present in soils at around 5. 7. Ammonia toxicity (ph greater then 8 or near urea fertilizer) (kills roots and seeds of plants) Base cations: ca2+, mg2+, k+ (all of the cations, except h+ and al3+) Main two base cations in ontario: calcium and magnesium carbonates.

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