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适时打顶能有效地协调棉花营养生长和生殖生长的矛盾,改变棉株体内营养物质的积累与合成,分配与运输的状况,养分向蕾铃转送,使棉铃增多,增重。同时还可有效地控制主茎高度,改变通风透光条件,减少蕾铃脱落,有利于增产和早熟。
Timely topping can effectively coordinate the contradiction between vegetative and reproductive growth of cotton, and change the status of accumulation, synthesis, distribution and transportation of nutrients in cotton plants. Nutrients can be transferred to buds and bolls, increasing cotton bolls and gaining weight. At the same time, the height of the main stem can be effectively controlled, the ventilation and light conditions can be changed, the falling of the buds can be reduced, and the yield and precociousness can be increased.