摘要： 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。

关键词: 棉花, 营养枝, 干物质积累分配, 产量

Abstract: The results showed that remaining vegetative branches had no effect on the dry matter accumulation and distribution of leaves and reproduction organs, but decreased the amount of dry matter accumulation of main stem. Earlier top shoot nipping of main stem could hasten the growth of main stem, but increase the total amount of dry matter accumulation. Analysis of yield components of cotton with vegetative branches, the number of bolls on main stem, average weight per boll were reduced. But the number of bolls on vegetative branches could make up for a lack of the bolls on main stem. So the number of bolls per hectare was increased and the yield of lint cotton was no less than that of cotton with traditional pruning. Earlier top shoot nipping of main stem could increase the number of bolls on vegetative branches and lint percent. But average weight per boll was reduced. There were no remarkable effects on the number of bolls and lint cotton per hectare.

Key words: Cotton, Vegetative branch, Accumulation and allocation of dry matter, Yield