Cotton is a crop that needs a large amount of fertilizer, but due to unreasonable fertilization, there has been a phenomenon that the yield of cotton does not increase with the increase of the amount of fertilizer, and at the same time, the investment for pest control increases with the amount of nitrogen fertilizer applied. The nutrient results of different fertilizers on crops have their own characteristics. For example, the characteristic of nitrogen fertilizer is the dark green color after application, which gives people a feeling of good enough soil and good fertilizer effect. This is caused by the growth of nitrogen fertilizer mainly due to the growth of stems and leaves, but overuse. Nitrogen fertilizer has many disadvantages: First, the excessive application of one side causes lengthiness, the fall of the bells, the difficulty in management, and the difficulty in controlling pests and diseases. On the other hand, the purchase of dilute amines and other hormones and controls are self-contradictory practices. Before you control, you will find yourself in trouble. It takes time and money to spend. Second, increase the occurrence of pests and diseases. According to the research results of the National Academy of Agricultural Sciences, the occurrence of H. armigera is directly proportional to the application of nitrogen fertilizer; the resistance of cotton to Verticillium wilt is inversely proportional to the amount of N fertilizer applied, because F. turcicum is caused by fungal infection. In the case of excellent environmental conditions (such as sunny days), photosynthesis is strong, and the absorbed nitrogen is synthesized into protein in time. The cotton vegetation is resistant to infection under low nitrogen and high carbon conditions. Even if it is infected, it is slow to breed due to germs. It is not easy to show symptoms; however, photosynthesis is weak under severe conditions, and the absorption of large amounts of nitrogen in roots cannot be immediately converted into protein to make the plant body in a state of weak constitution with high nitrogen and low carbon. At this time, nitrogen is used by bacteria to rapidly reproduce cotton. The conductive tissue, the weather turned fine, because the body's water supply is not on, and other related nutrition is also not timely and the performance is also sick. If the amount of nitrogen fertilizer is not excessively applied, the symptoms of upper extremities will be significantly relieved. This conclusion can be seen from the plots where no nitrogen fertilizer is applied. Therefore, it is recommended that the cotton must be applied with reasonable nitrogen fertilizer and must not be overdosed. If more care is taken, a certain amount of potassium chloride should be applied in a timely manner and sprayed with iron-containing microelement fertilizer in order to reduce accumulation of yellowish wilting. The occurrence of the disease.
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