随着土壤肥力的提高与化肥工业的发展,棉田施肥量日趋增加,为棉花增产提供了良好的物质基础.但近年来部分棉田施肥量盲目增加,且前期施肥多,施肥次数频繁,以致不能充分发挥增肥的经济效益.有的甚至发生肥害,减产减收.这在常年棉花株高为1米左右或更高的中上等棉田,表现最为突出.现就这类棉田合理施肥初步研究结果提出“两控一减”的经济施肥的商榷意见如下. With the improvement of soil fertility and the development of chemical fertilizer industry, the amount of fertilizing cotton is increasing day by day, which provides a good material basis for increasing cotton yield. However, in recent years, some fertilizers have increased blindly, Give full play to the economic benefits of increasing fertilization, and some even fatal, reduced production, which in the perennial cotton plant height of about 1 m or more in the upper and middle field, the performance of the most prominent. The results suggested that “two controls and one reduction” of economic fertilization of the views are as follows.