打顶尖是棉花整枝作业中的一项重要内容。它不仅能限制顶端优势,调节养分,而且能利用有效生育期,增铃增重。所以适时摘除顶心,对增产保质的作用不可低估。就一个地区而言,棉花打顶的适宜时期,应根据本地的气候特点和有效生育期来确定。朝阳地区六十年代提出了“枝到不等时,时到不等枝”的整枝原则,到了八十年代的今天,对这一原则有重新加以商榷之必 Topping is an important part of cropping cotton. It can not only limit the advantages of the top, regulate nutrients, but also take advantage of the effective growth period, bolting weight gain. So timely removal of the top heart, the role of increased yield and durability can not be underestimated. In a region, the optimum period for cotton topping should be based on local climatic characteristics and effective growth period. In the 1960s, the principle of pruning was proposed in the 1960’s when the branches were unequal to the branches. By the 1980s, it was necessary to reconsider this principle