南疆棉花不同群体对化学打顶剂的响应
Response of Different Groups of Cotton in Southern Xinjiang to Chemical Topping Agents

目的：研究化学打顶对不同株行距配置下棉花成铃特性和产量的影响，为农业植棉提供理论指导。方法：采用裂区试验设计，主区为化学打顶和人工打顶两种打顶方式；以行距配置为副区，设1膜3行(76 cm等行距) (s1)、1膜4行(76 cm + 10 cm + 76 cm) (s2)、1膜6行(10 cm + 66 cm宽窄行) (s3) 3个水平。结果：试验结果表明，与人工打顶相比，化学打顶后植株的上部铃数显著增加，从棉铃的纵向分布来看，塔河2号的上部棉铃数显著高于新陆中82号，增幅分别为28%、23%、22.6%。结论：初步表明，化学打顶可以有效调控棉铃空间分布、提高产量，具有一定的增产潜力，对机械化生产具有重要意义。
Objective: The effects of chemical topping on the boll formation characteristics and yield of cotton under different plant row spacing configurations were studied, so as to provide theoretical guidance for agricultural cotton planting. Methods: The split-zone test design was adopted, and the main area was chemical topping and artificial topping. With the row spacing configuration as the sub-area, there are 3 levels of 1 film with 3 rows (76 cm equal row spacing) (s1), 1 film with 4 rows (76 cm + 10 cm + 76 cm) (s2), and 1 film with 6 rows (10 cm + 66 cm wide and narrow rows) (s3). Results: The results showed that compared with manual topping, the number of upper boll of the plant in-creased significantly after chemical topping, and from the vertical distribution of cotton bolls, the number of upper boll of Tahe No. 2 was significantly higher than that of Xinluzhong No. 82, with an increase of 28%, 23% and 22.6%, respectively. Conclusion: The preliminary results show that chemical topping can effectively regulate the spatial distribution of cotton bolls to improve yield, and has a certain potential to increase yield, which is of great significance for mechanized produc-tion.