棉花烂铃是影响产量和品质的主要问题之一。棉田小气侯是影响烂铃程度的主要冈素。1963—1964年在美国密西西比州曾用陆地棉品种斯字7A进行过棉花脱叶试验,探索棉花下部脱叶对叶片郁闭下结铃区小气候变化的影响,以及影响棉花烂铃急剧扩展的主要小气候因素。播种行距1米,行长73米,8行区,重复4次。在大区内一部分用有机磷除叶剂 Cotton boll is one of the main problems affecting yield and quality. Cotton microclimate is the main factor affecting the degree of rotten bolls. In 1963-1964 in Mississippi, USA, we studied the cotton defoliating experiment with the cotton germplasm 7A and explored the effect of the lower defoliation of cotton on the microclimate change in the knotted zone under canopy and the main Microclimate factors. Sowing spacing of 1 m, president of 73 meters, 8 line, repeat 4 times. Part of the area with organic phosphorous leaf removal agent