Do not apply excessive phosphorus fertilizer

Calcium phosphate contains a large amount of free acid and is applied in large quantities continuously, which causes acidification of the soil. Calcium magnesium phosphate containing 25% --30% of the lime, a large amount administered will increase, and alkaline soils physicochemical properties deteriorate. Excessive application of calcium phosphate will cause zinc in the soil to interact with excess phosphorus, resulting in zinc phosphate precipitation, which cannot be absorbed by the crop. Excessive application of calcium magnesium phosphate fertilizer, excess phosphorus will interact with zinc in the soil, producing magnesium hydroxide that the crop can not absorb, causing zinc deficiency in crops. Appropriate application of phosphate fertilizer will promote the absorption of molybdenum by crops. However, excessive application of phosphate fertilizer will cause the phosphorus and molybdenum to lose nutrient balance, affecting the absorption of molybdenum by crops, and exhibiting “molybdenum deficiency”. According to the study, excessive application of phosphate fertilizer will also cause the silicon in the soil to be fixed and not absorbed, causing the crop to be deficient in silicon, especially for the grass crops of Si. The phosphorus content in the soil is too high, and the more phosphorus is absorbed by the crop, the more respiration of the plant is too strong, the dry matter consumed is greater than the accumulation, and the reproductive organs are developed in advance, causing the crop to mature prematurely, the grain is small, and the yield is low. The amount of phosphate fertilizer applied should generally be determined according to the available phosphorus content of the soil. When the content is less than 10 μl / L, 30-35 kg of standard phosphate fertilizer can be applied per 667 m 2 . Content of 10 - 20 l / l, 2 15 - 25 kg per 667 m is applied. Generally, phosphate fertilizer can be applied once a year.

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