Excessive fertilization is not only of low efficiency, but also destroys ecological balance, affects the quality of agricultural products, and directly or indirectly endangers the health of people and livestock. 1, excessive application of nitrogen fertilizer. It will lead to crop plants being long, weak stalks, dark green leaves, easy lodging and infection of pests and diseases, late-maturing lust, seed moisture, more difficult to dry and mold; vegetable nitrate content, rotten vegetables prominent phenomenon, some fruits Flavor and color deteriorate. What's more serious is that nitrate can be reduced to the nitrite, a toxic substance, which seriously harms human health. 2, excessive application of phosphate fertilizer. Because phosphorus fertilizer contains cadmium, fluorine, arsenic, rare earth elements, and chloral aldehyde, radioactive substances, it is easy to pollute the soil. In the soil contaminated with heavy metals such as cadmium and fluorine, crops such as fruits, vegetables, and grain are grown. People who eat for a long time can cause stomachache, fluorosis, and other diseases. 3, excessive application of potassium fertilizer. Prolonged use of physiologically acidic potassium sulfate fertilizers in acid soils will make the soil more acidic. Potassium chloride contains chlorine ions and adversely affects the quality of bogey-free crops such as potatoes, tobacco, hemp, sweet potatoes, beets, and tea. 4, excessive application of chemical fertilizers. Cause changes in soil trace elements, crops absorb nutrients is a certain number and proportion. Fertilizer dosage should be evenly distributed according to crop demand. Otherwise, the nutrient elements needed by the crop will be out of balance, which will lead to deficiency of crops and affect crop yield and quality. Such as rice lack of zinc "sit", rapeseed lack of boron, "flowers but not real", corn deficiency zinc "flower mosaic, white seedlings", cotton boron deficiency "falling, bell" and so on. Moreover, people who eat such foods and vegetables for a long time will cause some endemic diseases such as Keshan disease, Kashin-Beck disease, and fluorosis. In order to improve fertilizer utilization, protect soil resources and human and livestock health, it is necessary to strengthen the application of compound (mixed) fertilizers and soil testing formula fertilizers to improve the application of chemical fertilizers, attach importance to the use of trace elements, pay attention to the application of organic fertilizers and fertilizers, increase organic fertilizers Input.
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