Effects of Seeding Date and Topping Date on Yield and Fiber Quality of Short-Season Cotton Field-Seeded after Barley(Rape)/Wheat Harvest |
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| Authors: | Yang Changqin Zhang Guowei Liu Ruixian Ni Wanchao |
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| Institution: | Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences / The Key Laboratory of Cotton and Rape in Yangtze River Downstream of Ministry of Agriculture, Nanjing 210014, China |
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| Abstract: | Objective] The aim of this study was to evaluate the effects of seeding date and topping date on yield, yield characteristics and fiber quality of short-season cotton (CCRI 50) field-seeded after barley(rape)/wheat harvest. Method] A split-plot design with three replicates was used for the study in Nanjing, Jiangsu province of China in 2014-2015. The main plots comprised two seeding dates (S1: 25th May and S2: 10th June), while topping dates (T1: 30th July, T2: 7th August and T3: 15th August) constituted the subplots. Result] The lint yield, the ratio of yield before frost, boll number, boll weight and lint percent of S2 were lower than those of S1. The number of fruit branches and fruit nodes of S2 were less than those of S1 while it was the opposite for the boll setting ratio. The lint yield and the ratio of yield before frost decreased with the delay of topping date. The number of fruit branches and fruit nodes, the ratio of them increased with the delay of topping date while the boll setting ratio decreased. The interaction of sowing date × topping date showed that the treatment of S1T1 achieved higher value in lint yield and the ratio of yield before frost. The higher number of fruit branches and fruit nodes were found at the treatment of S1T1, S1T2 and S1T3 and higher boll setting ratio were found at the treatment of S2T1 and S1T1. Correlation analysis showed that the lint yield positively and significantly correlated with the number of fruit branches and fruit nodes and boll number, but did not significantly correlate withboll setting ratio and the ratio of fruit branches number to nodes number. In addition, the boll distribution ratios of middle and low fruit branches of S2 were more than those of S1 while it was the opposite for that of up fruit branches. The boll distribution ratios of middle and low fruit branches decreased with the delay of topping date while it was the opposite for that of up-fruit branches. The treatment of S1T1 could be better to improve fiber length and fiber strength of different fruit branches and the micronaire value of middle fruit branches. Conclusion] The treatment of S1T1 is conducive to high yield and fiber quality of short-season cotton field-seeded after barley(rape)/wheat harvest in lower reaches of the Yangtze River. |
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| Keywords: | short-season cotton field-seeded after barley(rape)/wheat harvest seeding date and topping date yield and yield characteristics fiber quality |
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