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麦棉套作因复种指数及产出的增加,从土壤中所带出的养分必然增多。若养分投入不合理.则可能造成一种或多种养分投入不足,不能满足麦、棉生长发育的需要而出现剥削地力或减产;也可能造成土壤养分不平衡。而出现不能稳产高产或减产。同时,
Cotton crop due to multiple crop index and output increase, brought out from the soil nutrients will inevitably increase. If the nutrient input unreasonable, it may result in one or more nutrients into the deficiencies, can not meet the needs of wheat and cotton growth and exploitation of the ground or reduce production; may also result in soil nutrient imbalance. The emergence can not be stable and high yield or cut. Simultaneously,