From 180 to 200 days from sowing to harvest, the cotton grows for a long period of time and consumes a large amount of fertilizer. Based on the reuse of basal fertilizer, it is necessary to properly force the fertilizer during the growth period of cotton to ensure a high yield of cotton. In the whole growth period of cotton, there is a clear trend of lesser, more, and less dynamic changes in the fertilizer requirement for the whole growing period. That is, the emergence of buds (the period from May 1 to June 10) is small; the buds are blooming (from June 10 to June 7). On the 5th of the month, the demand for fertilizer increased rapidly; the flowering boll (from July 5 to the end of August) required fertilization to reach the highest peak; the boll opening and one harvest (after the end of August) gradually decreased again. According to the law of fertilizer requirement in cotton life, the following four aspects of cotton dressing are determined: 1. Light, partial or no seedlings. Cotton is a sparse crop and there must be contributions to increase yields. As cotton enters a period of high growth, the competition among plants is fierce. It is easy for weak seedlings to contend for nutrients and there is a phenomenon of budding and flowering (commonly known as "public cotton"). Therefore, cultivating strong seedlings is the basis for high yield. When the Baha is adequate, when the emergence is neat and consistent, it is possible to give light or no Miaofei; when the seedlings are high, short, strong, and weak, they must be applied to the short and weak seedlings to promote strong growth and seize high yields. 2. The stable application of bud fertilizer. After budding, buds begin to appear and the amount of fertilizer needs to increase rapidly. Nitrogen fertilizer should be topdressed to supplement the deficiency of nutrients. Attention should be paid to the time when topdressing nitrogenous fertilizer. It should be carried out during the period of Shenglei (after the end of June), and 5 to 8 kg of urea should be recovered by Mu. 3. Reapply flower bud fertilizer. When cotton enters the flower bud stage, it needs to reach the highest peak of the fertilizer, and the growth is most prosperous. The re-application of bud fertilizer can play a significant role in increasing production during this period. Shiba time to master in the 7-10 days after flowering, the lower part of the seated a bell with a diameter of more than 2 cm (July 15-20), acres of topdressing urea 10-15 kg, promote plant growth in the lower peach. 4. Apply top cover fertilizer. In early August, when cotton enters the boll opening stage, the amount of growth gradually weakens. Applying the top dressing fertilizer in appropriate amounts during this period can serve the upper autumn peach, and at the same time, it can also improve the quality of autumn peach. Mu recovery urea 3 ~ 5 kg, combined with pest control foliar spray fertilizer, with 2% urea and 0.2% potassium dihydrogen phosphate mixture spray.