Huanghuai sponge area Fertilization principle (1) Add organic fertilizer and promote organic and inorganic cooperation. (2) According to the soil fertility conditions, the amount of nitrogen and phosphorus fertilizers should be appropriately adjusted, and the potassium fertilizer should be applied reasonably, paying attention to the combined application of boron and zinc. (3) The application of nitrogen fertilizer in stages, increase the proportion of nitrogen fertilizer application in the middle stage of fertility, and reduce the proportion of base fertilizer. (4) Fertilizer application should be combined with irrigation and flood control techniques and other high-yield and high-quality cultivation techniques. 2. Fertilization advice Under the condition of 70~90 kg of lint cotton, 2000 kg of high-quality organic fertilizer, 11~13 kg of nitrogen fertilizer (N), 5-7 kg of phosphate fertilizer (P2O5) and 5-7 kg of potassium fertilizer (K2O). For cotton fields lacking boron and zinc, pay attention to the application of boron and zinc fertilizers. The dosage of boron and zinc fertilizer is 1~2 kg per mu, and the concentration of leaf spraying is 2 g/l, which is carried out in the bud-flowering period. 25%~30% of nitrogen fertilizer is used as base fertilizer, 25%~30% is used in early flowering stage, 25%~30% is used in full bloom period, 10%~25% is used as topping fertilizer; 15% phosphate fertilizer is used as seed fertilizer, 85% Phosphate fertilizer is used as base fertilizer; potassium fertilizer is used as base fertilizer or base chasing (initial flowering period). Starting from the flowering period, the cotton field with weak growth, combined with the application of mixed spraying 0.5%~1.0% urea and 0.3%~0.5% potassium dihydrogen phosphate solution 50~75 kg/mu, spray once every 7~10 days, continuous Spray 2~3 times. This article URL: Guilin Opinions on Cotton Science Fertilization Technology in Huanghuai Sea Cotton Area in Spring of 2015 Others Air Dryer,Small Air Dryer,Refrigerated Compressed Air Dryer,Dryer Compressor Hangzhou Zhongju air separation equipment manufacturing Co., Ltd , https://www.hzzjkfzz.com