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Fertilizer also has acidity
Fertilizer has two different reactions, namely chemical reaction and physiological reaction. Chemical reaction refers to the reaction of the fertilizer dissolved in water. For example, the solution of calcium superphosphate is acidic, the solution of ammonium bicarbonate is alkaline, and the solution of urea and potassium chloride is neutral. Physiological reaction refers to the reaction produced after the fertilizer is selected and absorbed by crops. For example, ammonium sulfate, the crop absorbs more ammonium ions than sulfate ions, and substitutes more hydrogen ions from the soil colloid to increase the acidity of the soil, which is called physiological acidic fertilizer. Another example is sodium nitrate. The crop absorbs more nitrate ions than sodium ions. Substitution of carbonate ions from the root colloids with sodium ions results in the hydrolysis of sodium carbonate into hydroxide ions, which increases the alkalinity of the soil. So sodium nitrate is Physiological alkaline fertilizers. In addition, there is a class of physiologically neutral fertilizers, such as ammonium nitrate, which cannot respond to soil changes when applied to soil.