打顶剂不同喷施时间对南疆棉花产量、品质的影响

Effect of different spraying time of topping agent on cotton yield and quality in south Xinjiang

为提高化学打顶剂应用效果,筛选棉花打顶剂在阿拉尔垦区的最佳喷施时间,选用新陆中37号与新陆中70号两个南疆主推棉花品种,设置不打顶(T0),7月1日人工打顶(T1,CK),4个化学打顶处理分别于:7月1日(T2)、7月6日(T3)、7月11日(T4)及7月16日(T5)开始喷施打顶剂,共6个处理,喷施打顶剂前于6月18日、28日、7月8日分三次配合喷施塑型剂。测定并比较株型、产量及棉纤维品质等变化情况。结果表明:喷施化学打顶剂的棉株较不打顶处理下的株高、节数显著降低,与人工打顶处理下的产量基本持平;棉花品种不同,最佳喷施时间不同,新陆中37号的最佳喷施时间为7月11日,新陆中70号为7月1日,此时喷施化学打顶剂能够有效控制植株高度,并能够获得最大经济效益。

In order to improve the application effect of chemical topping agent,to screen the best spraying time of cotton topping agent in Alar Reclamation Area,select two major cotton varieties in southern Xinjiang,Xinluzhong No.37 and Xinluzhong No.70.Six treatments were set,including no topping(T0),manual topping on July 1(T1,CK),there are 6 treatments,four chemical topping treatments were sprayed on July 1(T2),July 6(T3),July 11(T4)and July 16(T5).Before spraying topping agent,it should be sprayed three times on June 18,28 and July 8.Measure and compare changes in plant type,yield and cotton fiber quality.The test results show that the plant height and node number of cotton plants sprayed with chemical topping agent are significantly lower than those under no topping treatment,and the yield is basically the same as that under artificial topping treatment;for different cotton varieties,the best spraying time will be different;the best spraying time for Xinluzhong No.37 and Xinluzhong No.70 is July 11 and July 1,respectively.At this time,spraying chemical topping agent can effectively control the plant growth height,and can obtain the greatest economic benefits.