Improper or excessive application of chemical fertilizers in crops often leads to gluttony, long-term, late-maturing, weakened resistance, easy lodging, increased pests or burns, and wilting, and reduced yields. The whole person died. This kind of bad phenomenon caused by chemical fertilizer is called "fertilizer". There are three main reasons for the production of fertilizers on crops : one is water loss. If the application of chemical fertilizer is too much or the soil moisture is insufficient after fertilization, the soil is caused. The concentration of the soil fertilizer solution is too large, causing the water in the crop cells to reverse osmosis, causing the crop to lose water, causing wilting, affecting normal development and causing death; the second is burns. Some fertilizers, such as ammonium bicarbonate, are applied at relatively high temperatures. It is easy to produce a large amount of ammonium gas, burn the leaves and roots of the crop, the lower part of the lighter leaves are yellow, the heavy ones die, and the third is poisonous. Fertilizing too much beyond the crop's need for an element, producing poison on crops Harm, leading to stunting and reduced production. In addition, some fertilizers, such as lime nitrogen, if converted directly, will be converted into toxic substances in the soil, poisoning the roots of crops, causing crop damage and even death. According to the fat The reason is that when applying chemical fertilizers, it is necessary to master the abundance level of soil nutrients and the demand for nutrients in crops, and carry out scientific and rational fertilization. Do not increase the dosage. Generally take heavy-duty light topdressing and topdressing Do not use too much, and pay attention to the application method to prevent injury. After the occurrence of fertilizer damage, the cause should be analyzed in a timely manner, and remedial measures should be taken in a targeted manner. If there are too many nitrogen fertilizers in the wheat, the wheat seedlings will have more yellow feet and more small points. Like, i.e. be increased phosphorus, potassium, calcium superphosphate plus 2 1 kg per 667 m 2 after 24 hours of immersion applicator ash, supernatant taken on sunny uniform foliar spraying pm and 50 with 50 kg of water per 667 m --100 kg. In addition, plant growth regulators such as paclobutrazol or chlormequat may be sprayed according to the concentration requirements to inhibit the growth of wheat stems, promote root development, and effectively alleviate or reduce fertilizer damage.
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