Abstract: 【Objective】 The effect of different rehydration time after chemical detopping on the sealed cotton was clarified, the effect of watering on the sealing effect was reduced, and the cotton yield was guaranteed, which provided a reference for the application of chemical sealing technology.【Method】 The field plot experiment was used to set up the different rehydration time after the chemical detopping, and the agronomic traits, dry matter accumulation and yield of cotton were investigated and the data were analyzed.【Result】 Premature rehydration after chemical detopping could increase the plant height of cotton as high as 78.36 cm, 8.81 cm higher than the lowest treatment, and 0.8 more fruit branches. The abscission rate of buds and bolls increased with the time of rehydration, and the H4 with the highest shedding rate was 61.33% .The accumulation of dry matter and nitrogen was not affected by rehydration sooner or later, but the earlier dry matter accumulation was earlier, and the nitrogen accumulation in vegetative organs was higher, as well. With the time of rehydration on cotton, yield had a certain effect, and the weight of single boll, lint and seed cotton treated by H2 were the highest, which were 6.0 g, 40.75% and 5,661.97 kg/ha, respectively.【Conclusion】 After chemical detopping, the earliest watering interval should not be less than 3 days, and the latest should not exceed 7 days.

Key words: cotton; chemical detopping; rehydration; yield

摘要： 【目的】研究化学封顶后不同复水时间对化封棉花的影响,减少浇水对化封效果的影响,保证棉花产量,为化封技术应用提供参考。【方法】采用田间小区试验,设置化学封顶后不同的复水时间,调查与分析棉花农艺性状、干物质积累、产量等。【结果】化学封顶后过早复水易使棉花株高增加,H1处理株高达78.36 cm,比最低处理高8.81 cm,果枝数多0.8台;蕾铃脱落率随复水时间早晚顺序增加,脱落率最高的H4处理为61.33%;干物质和氮素积累受复水早晚影响不大,但复水时间越早的前期干物质积累快,营养器官氮素积累高;复水早晚对棉花产量具有一定的影响,H2处理的单铃重、衣分、籽棉产量均为最高,分别为6.0 g、40.75%和5 661.97 kg/hm²。【结论】棉花化学封顶后最早浇水间隔不要小于3 d,最晚不宜超过7 d。

关键词: 棉花, 化学封顶, 复水, 产量