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Journal of Integrative Agriculture  2021, Vol. 20 Issue (11): 2892-2899    DOI: 10.1016/S2095-3119(20)63280-4
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Optimizing the application of a novel harvest aid to improve the quality of mechanically harvested cotton in the North China Plain
MENG Lu1, ZHANG Li-zhen2, QI Hai-kun1, DU Ming-wei1, ZUO Yan-li3, ZHANG Ming-cai1, TIAN Xiao-li1, LI Zhao-hu1 
1 Engineering Research Center of Plant Growth Regulator, Ministry of Education/College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China
2 College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China
3 Hebei Cottonseed Engineering Technology Research Center, Hejian 062450, P.R.China
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棉花的脱叶催熟技术在机械收获中必不可少,尤其是在华北平原,由于热量资源不足,导致收获时残留绿叶和未开裂棉铃的比例较大,棉花机械收获受到限制。确定棉花脱叶催熟剂最佳用量,同时最大程度地减少产量和品质的损失至关重要。本文主要研究一种新型脱叶催熟剂-欣噻利(XSL,10%噻苯隆和40%乙烯利的复配剂)对棉花叶片和棉铃的空间分布,以及产量和品质的影响。本试验共设置了四个处理:不同的XSL剂量(1800和2700 mL ha-1),应用两次(分为两次应用,每次1350 mL ha-1)和无XSL(清水)对照。该大田试验于2016-2017年在中国河北进行。结果表明:与清水对照相比,所有脱叶催熟处理均未显著影响棉花的产量和纤维品质。两年数据显示,2700 mL ha-1 XSL一次性喷施的棉花吐絮率比清水对照高13.5%,而其他两个处理均未达到显著水平。三个XSL处理的脱叶率之间没有显著差异,但平均比清水对照高42.2%。年份对XSL应用效果较为显著,表明气候因素会影响XSL的应用。我们得出的结论是,在黄河流域棉区使用XSL的最佳剂量为2700 mL ha-1,而且无需分成两次应用。我们的结果将促进棉花机械化收获并降低棉花生产的人工成本

Defoliation is an indispensable step in cotton production with mechanical harvesting, especially in the North China Plain (NCP) where mechanical harvesting is limited by a large proportion of green leaves and unopened bolls at harvest time due to insufficient thermal resources.  It is essential to quantify the optimal use of defoliation products while minimizing yield and quality loss in China.  The objective of this study was to test the effect of a new defoliant Xinsaili (XSL, a compound of 10% thidiazuron and 40% ethephon) on the spatial distribution of cotton leaves and bolls, yield and quality in the NCP.  There were four treatments: XSL 1 800 mL ha–1 , XSL 2 700 mL ha–1, XSL splitted into two equal applications (1 350 mL ha–1 for each), and XSL-free (water) control.  Field experiments were conducted in Hebei, China in 2016–2017.  All the defoliant treatments did not significantly affect cotton yield and fiber quality compared with the water control.  At harvest time, the rate of open bolls under XSL 2 700 mL ha–1 was 13.5% higher than that under XSL-free control, while the other two treatments showed no significant difference, across the two years.  Defoliation percentage of the three XSL treatments showed no difference, but they were on average 42.2% higher than that of XSL-free control.  The year-round effect of the defoliant XSL was significant, indicating that climate factors would affect its application.  It was concluded that the optimal dose of XSL in the NCP was 2 700 mL ha–1, and it was unnecessary to split it into two applications.  These results would promote cotton mechanical harvesting and reduce the labor cost of cotton production in China.
Keywords:  thidiazuron ')" href="#">  
Received: 17 March 2020   Accepted:
Fund: This work was supported by the National Key Research and Development Program of China (2018YFD0100306) and the National Natural Science Foundation of China (31301257).
Corresponding Authors:  Correspondence DU Ming-wei, Tel: +86-10-62734550, E-mail:   
About author:  MENG Lu, E-mail:;
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MENG Lu, ZHANG Li-zhen, QI Hai-kun, DU Ming-wei, ZUO Yan-li, ZHANG Ming-cai, TIAN Xiao-li, LI Zhao-hu. 2021. Optimizing the application of a novel harvest aid to improve the quality of mechanically harvested cotton in the North China Plain. Journal of Integrative Agriculture, 20(11): 2892-2899.

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