江苏农业学报2025，Vol.41Issue(5)：840-847,8.DOI:10.3969/j.issn.1000-4440.2025.05.002
早打顶对棉花集中成熟的影响机制
Influencing mechanism of early topping on the concentrated maturation of cotton
摘要
Abstract
Concentrated maturation is essential for the mechanized harvesting of cotton.To explore new approaches for achieving concentrated maturation in cotton,experiments were conducted using a commercial cotton cultivar K836 as the testing material in 2022 and 2023,with the two treatments such as early topping at early flowering stage and conventional topping at peak flowering stage(CK).The effects of different topping times on plant architecture,spatial and temporal distribution of cotton bolls,dry matter accumulation and partitioning,yield and quality,and concentrated maturation were compared.The results showed that early topping had no significant impact on seed cotton yield and fiber quality compared to conventional topping.Compared with CK,the cotton boll weight and bio-logical yield of early topping treatment decreased by 9.1%and 24.0%,respectively,and the cotton boll density and har-vest index increased by 11.6%and 33.2%,respectively.The number of fruit branches in early topping treatment decreased by 40.5%,the leaf area index and dry matter accumulation in peak flowering stage,peak boll-setting stage and boll opening stage decreased significantly,but the node-branch ratio increased by 59.3%.Compared with CK,partition ratios of photosynthetic products to cotton bolls in peak flowering stage,peak boll-setting stage and boll opening stage increased by 10.6%,29.2%and 32.7%,respectively.The boll-opening rate at 42 d after initial boll opening in early topping treatment was 92.8%,which was sig-nificantly higher than that of CK(63.8%).The time required for the boll opening rate to reach 95.0%in early topping treatment was ten days shorter than that of CK.Therefore,under the conditions of this experiment,topping at the early flowering stage could promote the concentrated maturation of cotton on the basis of maintaining the stability of cotton yield and quality.This study provides a new path for the regulation of cotton concentrated maturation.关键词
棉花/早打顶/产量形成/集中成熟/集中吐絮Key words
cotton/early topping/yield formation/concentrated maturity/concentrated boll opening分类
农业科技引用本文复制引用
李亚楠,孙琳,孙红春,董合忠,聂军军,战丽杰,徐士振,李振怀,张艳军,代建龙,崔正鹏,张冬梅..早打顶对棉花集中成熟的影响机制[J].江苏农业学报,2025,41(5):840-847,8.基金项目
国家自然科学基金项目(32372229) （32372229）
国家棉花产业技术体系项目(CARS-15-15) （CARS-15-15）
