As we all know, the soil is acidic and alkaline. In fact, there are also chemical fertilizers. However, many farmers purchase and apply chemical fertilizers, which are not considered. They only care about the nutrient content and the ratio of nitrogen, phosphorus and potassium to the nutrient distribution, resulting in poor fertilization.
The acidity and alkalinity of chemical fertilizers can be divided into chemical acidity and alkalinity and physiological acidity and alkalinity. The former refers to the acidity and alkalinity exhibited by the fertilizer dissolved in water, and the latter refers to the acidity and alkalinity of the soil after the fertilizer is applied into the soil and absorbed by the crop.
Ammonium sulfate, superphosphate, etc. are acidic or weakly acidic in water, ammonia water, potassium carbonate and the like are alkaline or weakly alkaline in water, and urea, potassium sulfate, calcium nitrate and the like are neutral in water.
Fertilizers such as sodium nitrate and calcium nitrate are applied to the soil, and are absorbed and utilized by plants. The soil is alkaline, so it belongs to physiological alkaline fertilizer.
Ammonium bicarbonate, urea, etc., after being applied to the soil for absorption and utilization by plants, the soil is neutral or nearly neutral, so it belongs to physiological neutral fertilizer.
The acidity and alkalinity of the soil 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. Alkaline or physiological alkaline fertilizers, such as calcium nitrate, ammonia, ammonium bicarbonate, calcium magnesium phosphate, etc., must be used on acidic soils; in alkaline soils, especially calcareous soils, it is advisable to apply superphosphate, ammonium sulfate, Acidic and physiologically acidic fertilizers such as ammonium chloride to increase soil acidity, making it difficult for phosphorus to combine with calcium to form insoluble calcium phosphate salts, reducing the effectiveness of phosphorus, and also increasing boron, manganese, molybdenum, zinc, iron and copper. Effectiveness.
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