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适时打顶是棉花增产的重要措施之一。它能有效地协调棉花营养生长和生殖生长的矛盾,改善植株体内营养物质的积累与合成,分配与运输的壮况,把有限的养分较多地转移到蕾铃中去,对降低蕾铃脱落,提高棉花产量起着重要的作用。但适宜的打顶时期,常随气候状况、土壤肥力、灌溉条件、植株密度、品种特性等不同而异。去年在一般肥水的棉田中进行棉花打顶时期试验,结果是:以7月中旬打顶产量最高,过早、过晚均有减产的趋势。原因是适时打顶协调了营养生长和生殖生长的关系,促进棉花的正常生长发育。打顶过早,营养体小,不能充分发挥增产潜力;打顶过晚,营养体过大,生殖生长失调,难以高产。
Timely topping is one of the important measures to increase cotton production. It can effectively coordinate the conflict between vegetative and reproductive growth of cotton, improve the accumulation and synthesis, distribution and transportation of nutrients in plants, and transfer more limited nutrients into the buds, , Improve cotton production plays an important role. However, the appropriate topping period, often with the climatic conditions, soil fertility, irrigation conditions, plant density, variety characteristics vary. Last year in the cotton field fertilizer generally cotton during the period of the experiment, the result is: topping in mid-July the highest yield, premature, too late have cut production trends. The reason is that timely coordination of the relationship between vegetative and reproductive growth, and promote the normal growth and development of cotton. Topping too early, nutrition body is small, can not give full play to the yield potential; Topping too late, nutrition body is too large, reproductive growth disorders, difficult to high yield.