Cotton Dressing Principle In Three Major Producing Areas

　　 cotton Topdressing should be adapted to local conditions, such as the characteristics of different cotton producing areas. Top dressing The principles of application vary.

In the Huang Huai cotton area, the amount of nitrogen and phosphorus fertilizer used in this area is generally high, the effect of increasing fertilizer production is reduced, and the shortage of organic fertilizer and the occurrence of lack of boron and zinc in trace elements occur. In the top dressing of high-yield cotton, we should grasp the essentials of Sheng Lei - first flower chasing the first fertilizer, flower and boll chasing second fertilizer, and post autumn fertilizer as appropriate. Specific will Nitrogenous fertilizer 15% to 20% of them were used in full bloom stage, and potassium fertilizer base catch up (initial flowering stage) was half and half. For cotton fields with weaker growth, spraying 0.5% ~ 1% urea and 0.3% ~ 0.5% potassium dihydrogen phosphate solution 50~75 kg / times, spraying once every 7~10 days, spraying 2~3 times continuously.

In the middle and lower reaches of the Yangtze River, the 25%~30% of nitrogen fertilizer was used as the top dressing for the flowering period. 15%~20% was used as the top dressing for the bell stage. For the cotton fields with weaker growth, 0.5%~1.0% urea and 0.3%~0.5% potassium dihydrogen phosphate solution were applied to 50~75 kg / times, spraying once every 7~10 day, and continuously spraying 2~3 times.

The cotton growing area in Xinjiang is characterized by plastic mulching and water and fertilizer integration. 20% to 25% of nitrogen fertilizer in the cotton field is used in the flowering season. The cotton fields under drip irrigation under mulch depend on the growth of cotton and water drops. However, the amount of fertilizer should not exceed 2 kg per mu per time.