脱叶催熟剂对棉花产量影响及应用效果分析

为了研究脱叶催熟剂欣噻利对棉花产量影响及其应用效果，本试验设计了2个播种密度、2个施用量，对棉花产量、脱叶率、开絮率、纤维品质进行比较分析。结果表明：密度为112500株/hm²、用量2700 mL/hm²处理霜前皮棉、籽棉总产最高；密度为82500株/hm²、用量1800 mL/hm²处理衣分最高；欣噻利对各处理的子指、株高、第一果枝高度、果枝数无明显影响。脱叶方面，密度为82500株/hm²时，各处理脱叶效果较好，上部、中部叶片脱叶率达到100%；112500株/hm²各处理脱叶率92%以上。催熟方面，密度为82500株/hm²时，各处理的开絮率整体高于112500株/hm²。欣噻利对棉花纤维品质有一定影响，主要表现为上半部平均长度、断裂比强度略有下降。综合来看，棉花脱叶催熟剂欣噻利的应用效果较好，在机械化采收前或秋季棉花旺长不能正常成熟时，可以及时适量使用。

Defoliation & Ripping Agent: Effect on Cotton Yield and Application Analysis

In order to study the effect of defoliation & ripping agent (Xinsaili) on cotton yield and its application, two cotton planting densities and two dosages were set up, and the yield, defoliating rate, boll opening rate and fiber quality were compared and analyzed. The results showed that the total yield of lint and seed cotton before frost was the highest when the density was 112500 plants/hm² and the dosage was 2700 mL/hm². The lint percentage was the highest when the density was 82500 plants/hm² and the dosage was 1800 mL/hm². Xinsaili had no obvious effect on the seed index, plant height, the height of the first fruit branch and the number of fruit branches in each treatment. For defoliation rate, the effect was better at the density of 82500 plants/hm², the defoliation rate could reach 100% at the upper and middle positions of the plant, while the defoliation rate was over 92% at the density of 112500 plants/hm². In terms of ripening, boll opening rate at the density of 82500 plants/hm² was higher than that of 112500 plants/hm². Xinsaili had a certain influence on the fiber quality, which was mainly shown as slight decrease of upper half length and breaking tenacity. Taken together, the application effect of Xinsaili is good, and it can be applied with suitable dosage in time before mechanical harvesting or when cotton flourishes in autumn but does not mature properly.