研究结果表明 ,留营养枝对棉花叶和生殖器官的干物质积累分配无显著影响 ,但影响主茎的生长 ,使主茎干物质积累量减少 ;早打主茎顶心促进营养枝的生长 ,群体总干物质积累量增加。从产量构成因素分析 ,留营养枝棉花主茎果枝结铃数量减少 ,平均单铃重略有降低 ,但由于叶枝结铃可以弥补主茎结铃损失 ,群体总结铃数略有增加 ,皮棉产量与对照无显著差异 ;留营养枝早打主茎顶心 ,营养枝结铃数量增加 ,单铃重降低 ,但衣分提高 ,对群体铃数及皮棉产量无显著影响 The results showed that the vegetative shoots had no significant effect on the dry matter accumulation and distribution of cotton leaves and reproductive organs, but affected the growth of the main stems and reduced the accumulation of dry matter in the main stems. Earlier hit the top of the main stems to promote the growth of vegetative shoots, Total dry matter accumulation increased. From the analysis of yield components, the number of bolls of boll stems in vegetative shoots decreased and the average single boll weight decreased slightly. However, the number of bell bolls in the stems slightly increased due to the boll bolling, There was no significant difference between the control and the control group. The number of bolls of vegetative shoots increased with increasing number of bolls, while the boll weight decreased with the increase of the number of bolls, but no significant effect on boll number and lint yield