利用地膜覆盖栽培棉花，可以促进棉花早发、早熟．优质、高产。但早衰是地膜棉的致命伤。其原因如下： 一、早发脱肥是因前期气温高，棉花发育早，到了７月中旬形成“上部开花、下部结桃、四周现蕾”的生育势态，生育进程快而集中，对肥料要求早施、速效。按常规施肥方法，肥料 The use of mulching cotton cultivation, cotton can promote early hair, early maturity. High quality, high yield. But premature aging is a mortal wound cotton membrane. The reasons are as follows: First, early fattening due to high pre-temperature, early cotton development, to the middle of July the formation of “upper flowering, the lower part of the peach, surrounded by budding” growth trend, fast and concentrated fertilization process, the fertilizer requirements Early application, quick. According to conventional fertilization methods, fertilizers