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Evaluating the effects of defoliant spraying time on fibre yield and quality of different cotton cultivars

Published online by Cambridge University Press:  17 February 2023

Liyuan Wang Open the ORCID record for Liyuan Wang [Opens in a new window] ,
Yongsheng Deng ,
Fanjin Kong ,
Bing Duan ,
Muhammad Saeed Open the ORCID record for Muhammad Saeed [Opens in a new window] ,
Ming Xin ,
Xiaoge Wang ,
Liying Gao ,
Guifang Shen  and
Jinghui Wang
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Liyuan Wang
Affiliation:
Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Yongsheng Deng
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Fanjin Kong
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Bing Duan
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Muhammad Saeed
Affiliation:
Department of Botany, Faculty of Life Sciences, Government College University Faisalabad, Faisalabad 38000, Pakistan
Ming Xin
Affiliation:
State Key Laboratory of Crop Biology/Agronomy College, Shandong Agricultural University, Taian 271018, China
Xiaoge Wang
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Liying Gao
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Guifang Shen
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Jinghui Wang
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Zongfu Han
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Zongwen Wang*
Affiliation:
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Xianliang Song*
Affiliation:
State Key Laboratory of Crop Biology/Agronomy College, Shandong Agricultural University, Taian 271018, China
*
Author for correspondence: Zongwen Wang, E-mail: wangzw66@163.com; Xianliang Song, E-mail: songxl999@163.com
Author for correspondence: Zongwen Wang, E-mail: wangzw66@163.com; Xianliang Song, E-mail: songxl999@163.com
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Abstract

Chemical defoliants are widely used in cotton (Gossypium L.) to accelerate leaf abscission and boll maturation, as well as, to facilitate mechanical harvesting. The current study was conducted to determine the interactive effect of cotton cultivars and spraying time of defoliant on defoliation, boll opening, fibre yield and quality. An experiment was performed with four cultivars and three defoliant spraying time during 2019 and 2020 in split plot design with three replications. At harvest, the defoliation and boll opening rate of all treatments after spraying defoliant was 94.6 and 85.4%, while the blank control (water) was 73.9 and 79.1%, respectively. After spraying defoliant, the effects of defoliation rate, boll opening rate, fibre yield and quality were different among cultivars, indicating that different cultivars had different responses to defoliant. Among them, L7619 was the most sensitive to defoliant, with the average defoliation rate of 95.6% and a seed cotton yield reduction of 882.9 kg/ha. Among the different time of applications, late spraying (17 September, B3) of defoliant recorded the highest defoliation rate (97.3%), boll opening rate (89.8%), seed cotton yield (3991 kg/ha) and steadily increased the fibre strength by 0.59 cN/tex compared with the control. Late spraying of defoliant had little or even no adverse effect on the remaining fibre quality traits (length, uniformity, micronaire and elongation). In general, these results suggested that the appropriate time for spraying defoliant can be determined based on the sensitivity of the cotton cultivar, the weather conditions at the field and the harvest time.

Keywords

Boll openingfibre related traitsleaf defoliationseed cotton yield
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 161 , Issue 2 , April 2023 , pp. 205 - 216
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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