What is the danger of using more phosphate fertilizer?

If there is more use of phosphate fertilizer, there will be any harm. Rational application of phosphate fertilizer can increase crop yield and improve product quality. For example, in cereal crops, it can accelerate crop tillering, promote young panicle differentiation, grouting and grain fullness, and promote early maturity; in crops such as melons, solanaceous vegetables and fruit trees, it can promote flower bud differentiation and flowering and fruiting, and improve the rate of results; When planting legume green manure, it can increase the yield of green manure and fresh grass, increase the nitrogen fixation rate of rhizobium, and achieve the purpose of “adding nitrogen with phosphorus”; in addition, it can increase sugar and potato crops such as berries, sugar beets, sugar cane and watermelon. The starch content in the potato pieces and the oil content of the oil crops.

However, the more phosphate fertilizer is not applied, the better, because the phosphate fertilizer applied in the year cannot be completely absorbed by the crop and will accumulate in the soil. Excessive application of phosphate fertilizer is not only unhelpful, but also harmful.

First, excessive application of phosphate fertilizer, crops will absorb too much phosphorus nutrition from the soil, promote crop respiration is too strong, consumption of dry matter is greater than accumulated dry matter, causing reproductive organs to develop in advance, causing crops to mature prematurely, small grains ,Low Yield.

Second, excessive application of phosphate fertilizer will induce zinc deficiency in the soil. Excessive application of calcium phosphate will cause zinc in the soil to interact with excessive phosphorus, resulting in precipitation of zinc phosphate that cannot be absorbed by the crop, causing obvious symptoms of zinc deficiency in the crop; soil alkalization after excessive application of alkaline phosphorus fertilizer such as calcium magnesium phosphate fertilizer , resulting in a decrease in the effectiveness of zinc, which in turn affects the absorption of zinc by crops.

Third, excessive application of phosphate fertilizer will cause the crop to lose phosphorus. Excessive application of phosphate fertilizer will also cause the silicon in the soil to be fixed, not absorbed by the crop, causing silicon deficiency, especially for grass crops with hi-silicon, such as rice, if it can not be absorbed from the soil. The silicon element will suffer from silicon deficiency, such as slender stems, lodging and poor disease resistance.

Fourth, excessive application of phosphate fertilizer will make the crops get phosphorus deficiency and molybdenum. Appropriate application of potassium dihydrogen phosphate phosphate fertilizer will promote the absorption of molybdenum by crops, and excessive application of phosphate fertilizer will lead to the imbalance of phosphorus and molybdenum, affecting the absorption of molybdenum by crops, and exhibiting "molybdenum deficiency".

Fifth, excessive application of phosphate fertilizer causes accumulation of harmful elements in the soil. Phosphate fertilizer is mainly derived from phosphate ore. Phosphate ore contains many impurities, including harmful elements such as cadmium, lead and fluorine. Phosphate application can cause an increase in cadmium in the soil, with an annual increase of 0.15%-0.08%, and the cadmium is highly effective and easily absorbed by crops, causing harm to humans and animals.

Sixth, excessive application of phosphate fertilizer will cause deterioration of soil physical and chemical properties. If calcium phosphate is applied to supplement the phosphate fertilizer, the superphosphate contains a large amount of free acid, and continuous application in a large amount will cause soil acidification. However, calcium magnesium phosphate contains 25%-30% lime, and the large amount of application will make the soil alkaline and the physical and chemical properties deteriorate.

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