不同脱叶剂对长江流域夏播短季栽培棉花脱叶催熟效果及产量和品质的影响

Effects of different defoliants on the defoliation,ripening effect, yield and quality of cotton in summer-sowing short-season cultivation in Yangtze River basin

  • 摘要: 【目的】 研究棉花在夏播短季栽培模式下对不同脱叶催熟剂的响应,为筛选适宜长江流域棉花栽培的脱叶催熟剂提供理论依据。【方法】 以成品脱叶剂欣噻利(50%噻苯隆·乙烯利)为对照(CK),以乙烯利和助剂为通用组分,分别配以98%噻苯隆、98%噻苯隆+50%敌草隆、98%磷酸二氢钾、10%脱落酸制成4种脱叶剂配方(对应标记为S、D、L和T处理),测定不同脱叶剂处理棉株的脱叶率、吐絮率、产量相关性状及棉花纤维品质指标,并通过相关分析和主成分分析比较不同脱叶剂处理对棉花脱叶催熟效果及产量和品质的影响。【结果】 随着脱叶剂喷施后时间的推移,棉花脱叶率和吐絮率均呈上升趋势。其中第10 d以CK的脱叶率最高(96.57%),D处理次之(95.76%),L处理的脱叶率显著低于其他处理(P<0.05,下同);吐絮率也呈相似趋势,以CK最高,D处理次之,L和T处理显著低于其他处理。在棉花产量方面,以D处理最高,S处理、CK和T处理次之,L处理最低;后期(8月30日)开花的棉铃产量性状表现也以D处理最优。纤维品质中,各处理对整齐度指数、马克隆值和伸长率无显著影响(P>0.05);上半部平均长度以CK最优、D处理次之;断裂比强度以D处理最高;后期(8月30日)开花的棉铃也同样以CK和D处理的纤维品质最优。相关分析和主成分分析结果表明,D和S处理及CK的脱叶及催熟效果较好,且均能不同程度提高棉花产量,改善棉花纤维品质。【结论】 不同脱叶剂以噻苯隆+敌草隆、噻苯隆和欣噻利效果较优,可在长江流域湖南地区夏播短季栽培模式下棉花生产种植中应用。

     

    Abstract: 【Objective】 To study the response of cotton to different defoliation and ripening agents under the shortseason cultivation mode of summer sowing,in order to provide theoretical basis for the screening of defoliation and ripening agents suitable for cotton planted in Yangtze River basin. 【Method】 The finished defoliant Xinsaili (50% thifensulfuron-ethylene)was used as the control(CK),and ethylene glycol and additives were used as the common components,and 4 defoliant formulations(corresponding to treatments labelled S,D,L and T)were made with 98% thifen-sulfuron,98% thifensulfuron+50% diuron,98% potassium dihydrogen phosphate and 10% abscisic acid respectively, and the defoliation rate,flocculation rate,yield related traits and cotton fiber quality indexes were determined after different defoliant treatments. The effects of different defoliant treatments on cotton defoliation and ripening as well as yield and quality were compared by correlation analysis and principal component analysis. 【Result】 The defoliation rate and flocculating rate of cotton showed an increasing trend as the time after defoliant spraying passed. The defoliation rate of CK was the highest(96.57%)on day 10,followed by D treatment(95.76%),and defoliation rate of L treatment was significantly lower than others(P<0.05,the same below);the flocculating rate also showed a similar trend,with CK being the highest,D treatment being the second highest,and L and T treatments being significantly lower than that of other treatments. In terms of the yield of cotton,it was the highest in D treatment,followed by S,CK and T treatments, and L treatment was the lowest. In the late(August 30)flowering cotton bolls,D treatment was the best in terms of yield traits;in fibre quality,there was no significant effect of the treatments on the uniformity index,Micronaire value and elongation rate(P>0.05). The average length of upper half was the optimal on CK,followed by D treatment;the fiber strength was the highest in D treatment. The best fibre quality was also observed in the later(August 30)flowering bolls under the treatments of CK and D. Combined with correlation analysis and principal component analysis,D and S treatments had better defoliation and ripening effects,and could increase cotton yield and improve cotton fiber quality to different degrees. 【Conclusion】 Thifensulfuron+diuron mixtures,thifensulfuron and the finished product of Xinsaili defoliant have fine effects,and can be applied in cotton production under the short-season cultivation mode of summer sowing in Hunan area of Yangtze River basin.

     

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