关键词: 单季稻, 单季稻, 叶面积指数, 气象条件, 校正系数, 湖州

Abstract: In order to study the feasibility of retaining nutrition branch with non-topping in Yangtze River region and the interaction effect of pruning with topping and DPC, the field experiments were conducted in 2011 and 2012 to study the effects of DPC and pruning with topping on cotton yield, yield components and fiber quality at the Lukou farmland in Ezhou, Hubei Province. The experimental material was hybrid cotton H318 variety. The results showed that retaining nutrition branch and non-topping could add the total boll number per square meter, but decreased the boll weight, the lint yield and boll number per square meter had significant differences in 2012, and increased 14.3% and 13.3%, respectively. Non-pruning and non-topping was no effect on yield, sometimes it could increase cotton yield, and the lint percentage was not affected by pruning and topping. Spraying DPC increased boll weight, but decreased boll number, and it had not a significant effect on lint yield, sometimes it decreased lint percentage. Pruning and topping and spraying DPC didn’t affect fiber length, they had a significant effect on uniformity index and micron value, respectively. Cotton had a bigger uniformity index if it was pruned and topped, and it had a better fiber length and specific breaking strength after spraying DPC. So, a conclusion can be got that retaining nutrition branch and non-topping had a potential to improve yield, and spraying DPC should be applied according to the cotton growing status.