Many farmers know that rational application of phosphate fertilizer can increase crop yields, improve product quality, speed up the delivery of cereal crops, promote young spike differentiation, filling and full grain, promote early maturing; can promote cotton, melons, solanaceous vegetables and fruit trees, etc. The flower buds of the crops differentiated and blossomed, and the fruiting rate increased; the sugar content of berry, sugar beet, sugar cane, and watermelon, the starch content in the potato crop, the oil content of the oil crop, and the seed protein content of the legume were increased. In addition, reasonable application of phosphate fertilizer can also improve crop drought resistance, cold resistance and resistance to salt and other stress.
However, few farmers know that the excessive use of phosphate fertilizer is not only unprofitable but also harmful.
The first is that crops absorb too much phosphorus from the soil, and thus the respiration is excessive. The dry matter consumed is greater than the accumulated dry matter, causing the reproductive organs to develop in advance, leading to premature maturation of the crop, small grains, and low yield.
The second is the effect of zinc in the soil and excess phosphorus, which produces zinc phosphate precipitation, induces zinc deficiency in the soil, and causes the crop to have obvious symptoms of zinc deficiency. Excessive application of alkaline phosphorus fertilizers such as calcium magnesium phosphate fertilizer will alkalinize the soil, reduce the effectiveness of zinc, and also affect the absorption of zinc by crops.
Third, it will cause the silicon in the soil to be fixed and cannot be absorbed, causing crops to suffer from silicon deficiency, and in particular to silicon-rich grass crops.
Fourth, it will cause phosphorus and molybdenum to lose nutrient balance, affect the absorption of molybdenum by crops, and show a lack of molybdenum disease.
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