化学封顶剂不同浓度处理对棉花农艺及产量性状的影响

[目的]研究新疆南疆棉区缩节胺(1,1-dimethyl-piperidinium chloride,DPC)化学封顶对棉花主要农艺性状及产量性状的影响,为新疆南疆棉花化学封顶技术提供理论支撑.[方法]于2019年在新疆南疆阿拉尔市16团开展田间试验,以人工打顶为对照,采用完全随机设计,研究不同DPC用量(0、90、1...

Effects of Different Concentrations of Chemical Topping on Agronomic Traits and Yield of Cotton

【Objective】 The objective of this research is to investigate the effects of chemical topping with mepiquat chloride(1,1-dimethyl-piperidinium chloride, DPC)on main agronomic and yield traits of cotton in the hope of providing theoretical support for the chemical topping technology in southern Xinjiang of China. 【Methods】 Field experiment was carried out in the 16 th regiment of Alar, southern Xinjiang during growing seasons of 2019. With manual topping as the control, a completely random design was adopted to study the effects of different concentrations of DPC (0, 90, 180 and 270 g/hm²) on cotton plant height, length of new main stem, number of new sympodials, yield and yield components. 【Results】 Compared with manual topping, the plant height of DPC chemical topping increased by 7.9-28.5 cm, the length of the new main stem increased by 8.8-22.3 cm, and the number of new fruit branches increased by 3.6-5.0. The high-rate of DPC (270 g/hm²) could increase the dry matter and accumulation rate of boll. Chemical topping did not affect boll weight and lint percentage. The high-dose of DPC (270 g/hm²) showed a slight decrease of 2.4% to the manual topping. 【Conclusion】 The application of DPC with 270 g/hm² for chemical topping in southern Xinjiang of China can not only obtain better consequent, but also will not reduce the yield of cotton.