山西农业大学学报（自然科学版）2019，Vol.39Issue(5)：16-22,7.DOI:10.13842／j.cnki.issn1671-8151.201901013
脱叶催熟剂用量对不同棉花品种脱叶效果及产量构成与品质的影响
Effects of different application rates of defoliant／ripener combination on the defoliation effectiveness , yield ,and fiber quality of cotton plants
摘要
Abstract
[Objective] T he study was performed to identify the optimal field application rates of defoliant／ripener combi-nation in mechanical harvest field in Hebei cotton production areas .[M ethods] T he field trails were conducted in 2017 and 2018 with a split-plot experimental design in which two cotton varieties (Ji 228 and line 327 ) and three application rates were selected as the treatment factors at first and second levels of randomization ,respectively .T he involved three application rates were thidiaauron 300 g·hm －2 + ethrel 2400 g·hm －2 (T1) ,thidiaauron 600 g·hm －2 + ethrel 2400 g· hm －2 (T2) ,and thidiaauron 900 g·hm －2 +ethrel 2 400 g·hm －2 (T3) ,and the application of tape water served as control treatment (CK ).T he effects of defoliant／ripener at different application rates were determined by measuring both defoli-ation and boll opening ratios after ten and twenty days post-treatment ,and boll weight ,lint percentage ,cotton yield , and fiber quality were assessed at harvest stage .[Results] T he defoliation ratio of crops positively reacted to the increase of thidiaauron amounts in all treatments except the treatment of line 327 in 2018 ,and the defoliation ratio both T 2 and T3 treatments were exceeded 90% in 2017 and 2018 except Ji 228 in T2 treatment in 2017 ,w hich reached the require-ment of mechanical harvest .The different application rates of thidiaauron didn′t produce significant effects on the boll opening ratio ,boll weight ,and seed cotton yield .The effectiveness of defoliant／ripener varied in different years .In the year of cotton de-veloping later (2017) ,the effects of defoliation were lower than expected but the effects of ripening were better ,and the seed cotton yield was increased by 4.5～11.0% and 4.4～12.4% for Ji228 and line 327 ,respectively ;while in the year of cotton developing earlier (2018) ,the effects of defoliant were better but the cotton yield was decreased .Line 327 was less sensitive to the defoliant／ripener than Ji228 in both two years.[Conclusion] The optimal application rate of defoliant／ripener was influenced by the cotton development conditions .For early mature varieties or in the year of cotton developing earlier ,the suitable applica-tion rate of thidiaauron were at 600 g·hm －2 ,but for late mature varieties or in the year of cotton developing later ,the applica-tion rate of thidiaauron should be increased to 900 g·hm－2 coupled with ethrel 2 400 g·hm－2 ,which could produce good defoli-ation ratio and meet the requirement of mechanical harvest .关键词
脱叶催熟剂/脱叶率/棉花/产量/品质Key words
Defoliant／ripener/Defoliation ratio/Cotton/Yield/Fiber quality分类
农业科技引用本文复制引用
Ma Ligang,Wang Shulin,Wang Yan,Lei Xiaopeng,Shi Xueping..脱叶催熟剂用量对不同棉花品种脱叶效果及产量构成与品质的影响[J].山西农业大学学报（自然科学版）,2019,39(5):16-22,7.基金项目
国家重点研发计划项目(2017YFD0201900) （2017YFD0201900）
河北省棉花产业技术体系(HBCT2018040201) （HBCT2018040201）
