Understanding soil acidity and alkalinity to improve fertilizer use rate

Understanding the acidity and alkalinity of the soil to improve the use rate of fertilizers. At present, most farmers' friends do not consider the acidity and alkalinity of the soil when fertilizing, and adopt the traditional fertilization method. As a result, the fertilizer use rate is not high due to the difference in acid and alkali of the fertilizer itself. Fertilization method, even considering the nutrient content of fertilizer and the ratio of nitrogen, phosphorus and potassium nutrition, the result is often poor fertilization effect. Therefore, mastering the acidity and alkalinity of fertilizers is of great help to rational fertilization.

Here we first introduce the pH of the soil. The pH 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. In general, alkaline or physiological alkaline fertilizers such as calcium nitrate, ammonia, ammonium bicarbonate, calcium magnesium phosphate, etc. must be used on acidic soils. Acidic fertilizers or physiological acid fertilizers such as ammonium sulfate should be used in alkaline soils. Calcium phosphate, etc.

In acidic soils, soluble phosphorus easily combines with iron and aluminum to form iron phosphate and aluminum phosphate, which reduces the effectiveness. Exchangeable potassium, calcium, magnesium, etc. in the soil are easily replaced by hydrogen ions, and once they encounter rain, they are lost. Acidic soils are also often deficient in sulfur and molybdenum.

In alkaline soils, especially calcareous soils, soluble phosphorus easily combines with calcium to form poorly soluble calcium phosphate salts, which reduces the effectiveness of phosphorus. The effectiveness of many trace elements such as boron, manganese, molybdenum, zinc and iron. It will also be greatly reduced, causing crops to often feel that these nutrients are insufficient and various physiological diseases occur.

In the process of fertilization, it is possible to first test the soil for acidity and alkalinity. Unconditionally, some adjustments or improvements can be made according to the usual fertilization rules. For soils that often use acidic fertilizers, if it is necessary to neutralize the acidity of the soil, The lime can be used to neutralize the active acid, the latent acid, and the soil structure. For the soil in which the alkaline fertilizer is often used, the alkali of the soil can be neutralized by using gypsum, phosphogypsum, ferrous sulfate, sulfur powder, acid weathered coal, and the like.

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