地膜棉的增产优势,正在被越来越多的人所认识。但是,如果底肥不足、追肥不当、管理不善,也会造成早衰而减产。据我们调查,早衰主要有以下几方面的原因:一是底肥不足,后期脱肥。地膜棉由于膜内温度高,土壤墒情好,根系入土浅,侧根须根多而发达,大都分布在0—20厘米耕作层内;由于温湿度好,肥料分解转化快,如果底肥不足,揭膜后追肥量又少,就会造成后期脱 Cotton film yield advantage, is being recognized by more and more people. However, if there is insufficient base fertilizer, improper dressing and poor management, it can also cause premature aging and reduce production. According to our survey, premature aging mainly in the following areas: First, insufficient base fertilizer, post-fattening. Mian membrane cotton as a result of the membrane temperature is high, soil moisture is good, the soil into the shallow roots, lateral roots and more developed, mostly distributed in 0-20 cm tillage layer; because of good temperature and humidity, decomposition and conversion of fertilizers fast, if the lack of base fertilizer, after uncovering Small amount of dressing, will result in later off