Effects of chemical topping on plant architecture and yield of cotton with different fruit branch numbers and its screening of evaluation indicators
[Objective]To study effects of spraying chemical topping agent on plant architecture and yield of cotton and evaluation index screening with different number of fruit branches,then determine the best appli-cation period of cotton chemical topping,optimize the evaluation indexes of chemical topping in the hope of providing support for the application of chemical topping.[Methods]A completely random experimental de-sign was adopted,manual topping was taken as the control,four chemical topping treatments when the number of fruit branches was 9,10,11 and 12 were established by selecting chemical topping agent Yaoqiansu and Xianglingzhuan,the plant height and plant height increased amount,length of the inverse first fruit branch to the inverse fourth fruit branch,effective branch rate,fruit nodes number per plant,stem diameter,main stem internodes number plant architecture related indexes,spatial distribution of bolls and seed cotton yield were measured.[Results]Compared with manual topping,the plant height of cotton was significantly heighten on the condition of spraying chemical topping agent when the number of fruit branches per plant were 9,the fruit nodes number per plant increased in case of spraying Xianglingzhuan while the number of fruit branches per plant were 10 and on the condition of spraying Yaoqiansu when the number of fruit branches per plant were 11 and 12,main stem internodes number per plant increased and the length of the inverse first fruit branch to the inverse fourth fruit branch became even shorter after chemical topping,the effective branch rate in case of spraying Xianglingzhuan while the number of fruit branches per plant were 10,stem diameter after chemical topping,and the spatial distribution of bolls were not much different except the proportion of upper bolls on the condition of spraying Yaoqiansu when the number of fruit branches per plant were 9.There was no significant difference in the yield of seed cotton in case of spraying Xianglingzhuan while the number of fruit branches per plant was 10,on the condition of spraying Yaoqiansu,when the number of fruit branches per plant was 11 and 12,compared with manual topping.Effective branch count per plant(hereinafter referred to as effective branch count)rate could be used as an evaluation index of chemical topping on cotton plant architecture regu-lation.[Conclusion]When the number of fruit branches per plant is 10 and 11,the effective branch rate and the number of fruit nodes per plant are the highest,the plant height growth is not large,and the seed cotton yield dose not reduce,the effective branch rate can be taken as the preferred evaluation index for the regula-tion of chemical topping on cotton plant architecture.
cottonchemical toppingplant architectureyieldevaluation index
万方数据
维普
