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Appropriate fertilization should be applied during the sowing, nursery and transplanting of cotton to ensure that the seedlings are full, Miao Qi and Miao Zhuang. Seed bed basal fertilizer and appropriate amount of cotton plants at seedling stage is small, the need for nutrients is not much, the amount of basal bed fertilizer should not be too much, emphasizing fine and appropriate. The organic fertilizer must be fully cooked and the weeds should be removed. If bio-organic fertilizer is used, the amount of seedbed per 10 square meters shall not exceed 5 kg, and the amount of compound fertilizer shall not exceed 1 kg. For the use of human fecal urine, apply 20 days in advance, plough after fertilization, and mix with soil. Can not use urea as bed base fertilizer. Daejeon's deep application of basal fertilizer and early planting There are currently many cotton fields that do not have ploughing and reserve cotton lines. The preparation work is lagging behind. The field of rapeseeds or wheat is ready to be transplanted into cotton seedlings. As a matter of urgency, one must pay close attention to deep-sweeping reserve cotton lines to grab basal fertilizer after harvesting rapeseeds and wheat, and apply 30-40 kg of compound fertilizer per acre. Cotton seedlings are topped with lighter weight and smaller roots in light cotton seedlings. The amount of topdressing fertilizer should not be too large at one time. Otherwise reverse osmosis will occur, which will reverse the flow of cotton seedlings and inhibit growth and development. Mutation in the bed should be suitable for the production of ammonaceous water or dilute urea solution, while Shi Hui Man Fung and other active liquid fertilizer. The transplanted cotton seedlings in field will be applied with urea after the new leaves are developed, and the amount per mu shall not exceed 5 kg.