Fertilizer application must pay attention to its acidity
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Chemical fertilizers can be divided into two types, chemical acid and alkaline, and physiological and alkaline. When purchasing and using chemical fertilizers, it is necessary to understand the acidity and alkalinity of chemical fertilizers so that they can be reasonably applied and improve fertilizer efficiency. Soil pH can not only directly affect the dissolution and sedimentation of nutrients in soil, but also affect the activity of microorganisms and indirectly affect the effectiveness of soil nutrients. In acidic soils, soluble phosphorus is easily combined with iron and aluminum to form iron phosphate and aluminum to reduce effectiveness. The exchangeability in the soil makes potassium, calcium, magnesium and other nutrients easily replaced by hydrogen ions. Once it encounters rain, it will be lost. Acidic soils also often lack sulfur and molybdenum. Therefore, acidic soil should use alkaline or physiological alkaline fertilizers, such as calcium nitrate, ammonia, ammonium bicarbonate, calcium magnesium phosphate fertilizer. In this way, the soil will not continue to be acidified, and the activity of nutrients such as sulfur and molybdenum will also be improved. Otherwise, the effectiveness of phosphate fertilizer will be reduced and the loss of nutrients such as potassium, calcium and magnesium will be caused. In alkaline soils, especially calcareous soils, soluble phosphorus is easily combined with calcium to form insoluble calcium phosphate salts, reducing the availability of phosphorus, and the effectiveness of many trace elements such as boron, manganese, molybdenum, zinc, and iron. It will also be greatly reduced, leading to insufficient nutritional elements, which in turn will cause various physiological diseases in crops. Therefore, in the calcareous or alkaline soils, acidic and physiological acidic fertilizers such as calcium superphosphate, ammonium sulfate, and ammonium chloride should be selected to increase the acidity of the soil, so that phosphorus is not easily combined with calcium to form insoluble calcium phosphate salts. The availability of phosphorus can also increase the effectiveness of boron, manganese, molybdenum, zinc, iron, and copper. Conversely, if acidic fertilizers are applied to acidic soils for a long time, the soils will be acidified, plated, and depleted, whereas in calcareous or alkaline soils, alkaline or physiological alkaline fertilizers will cause secondary salts of soil. Alkalization, structural deterioration, and fertility degradation.