Alkaline soils, characterized by high pH (often above 8.5) and sometimes high sodium content (sodic soils), are improved by adding amendments that provide calcium to replace excess sodium or neutralize alkalinity. Gypsum (calcium sulfate, CaSO4·2H2O) is the most commonly used and effective amendment for sodic and alkaline soils because it provides soluble calcium which can exchange with sodium on the soil's cation exchange sites. This process helps improve soil structure, water infiltration, and aeration.
Alkaline soils can be improved
Asked in JPSC CS Prelims 2024 · Topic: Ecology (Aquatic Ecosystems: Freshwater, Marine, Estuaries, Wetlands)
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