Fertilizer application should pay attention to its acidity and alkalinity

According to the acidity and alkalinity, chemical fertilizers can be divided into chemical acid and alkali and physiological acid and alkali. When purchasing and using chemical fertilizers, it is necessary to understand the acidity and alkalinity of chemical fertilizers in order to rationally apply and improve fertilizer efficiency. Soil pH can directly affect the dissolution and precipitation of nutrients in the soil, and can affect the activity of microorganisms, and indirectly affect the effectiveness of soil nutrients. In acidic soils, soluble phosphorus is easy to combine with iron and aluminum, and the formation of iron phosphate and aluminum reduces the effectiveness. The exchangeability in the soil makes potassium, calcium, magnesium and other nutrients easily replaced by hydrogen ions, and once it encounters rain, it will be lost. Acidic soils are also often deficient in 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, it will not cause the soil to continue to acidify, and it can also improve the activity of nutrients such as sulfur and molybdenum, otherwise it will reduce the effectiveness of phosphate fertilizer and cause the loss of nutrients such as potassium, calcium and magnesium. In alkaline soils, especially calcareous soils, soluble phosphorus easily combines with calcium to form poorly soluble calcium phosphate salts, reducing the effectiveness of phosphorus, and the effectiveness of many trace elements such as boron, manganese, molybdenum, zinc, and iron. It will also be greatly reduced, resulting in insufficient nutrients, which will lead to various physiological diseases in crops. Therefore, it is advisable to apply acidic and physiological acid fertilizers such as superphosphate, ammonium sulfate and ammonium chloride in the calcareous or alkaline soil to increase the acidity of the soil, so that phosphorus is not easily combined with calcium to form insoluble calcium phosphate salts. The effectiveness of phosphorus can also increase the effectiveness of boron, manganese, molybdenum, zinc, iron and copper. Conversely, if acid fertilizer is applied to acidic soil for a long time, it will acidify, slate and deplete the soil; while on calcareous or alkaline soil, alkaline or physiological alkaline fertilizer will cause secondary salt in soil. Alkalinization, structural deterioration and fertility degradation.
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