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首页> 外文期刊>Research on Crops >Effect of different defoliants and their rate and time of application on American cotton cultivars under semi-arid conditions of north-western India
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Effect of different defoliants and their rate and time of application on American cotton cultivars under semi-arid conditions of north-western India

机译：印度西北部半干旱条件下不同脱叶剂及其施用量和施用时间对美国棉花品种的影响

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摘要

Field studies were conducted to determine the effect of different defoliants i. e. Dropp ultra~R and Ethrel (ethefon), their rates and time of application (140 and 150 DAS) to influence earliness and yield in three cotton cultivars. MRC 7361 BGIl (3171.8 kg/ha) and MRC 7017 BGII (3083.3 kg/ha) gave significantly higher yield as compared to F 1861 (2454.9 kg/ha) due to better boll retention, boll weight and sympods. Dropp ultra~R @ 200 ml/ha recorded significantly highest yield (3111.6 kg/ha) followedby Ethrel @ 2000 ppm (2948.3 kg/ha) and control (2878.9 kg/ha), while statistically least yield (2674.5 kg/ha) was observed with Dropp ultra~R @ 225 ml/ha. Defoliants applied at 150 days after sowing (DAS) resulted in significantly higher yield (3017.7kg/ha) as compared to early application at 140 DAS (2789.0 kg/ha) owing to significantly improved boll retention and better boll weight. Data indicated that Dropp ultra~R @ 200 ml/ha had potential to promote crop earliness, better boll retention by keeping vegetative and reproductive growth in harmony to enhance seed cotton yield.
机译：进行了现场研究以确定不同的脱叶剂的作用。 e。 Dropp ultra_R和Ethrel（ethefon），它们的施用量和施用时间（140和150 DAS）会影响三个棉花品种的早熟和产量。与F 1861（2454.9 kg / ha）相比，MRC 7361 BGI1（3171.8 kg / ha）和MRC 7017 BGII（3083.3 kg / ha）的产量显着高于F 1861（2454.9 kg / ha），这是因为其棉铃滞留性，棉铃重和交感更好。 Dropp ultra〜R @ 200 ml / ha表现出最高的最高产量（3111.6 kg / ha），其次是Ethrel @ 2000 ppm（2948.3 kg / ha）和对照（2878.9 kg / ha），而统计学上最低的产量（2674.5 kg / ha）为用Dropp ultra〜R @ 225 ml / ha观察到。与140 DAS早期施用（2789.0 kg / ha）相比，播种（DAS）后150天施用的脱叶剂的产量（3017.7 kg / ha）明显更高，这是由于显着改善了铃铃保持力和更好的铃铃重量。数据表明，Dropp ultra〜R @ 200 ml / ha具有通过保持营养和生殖生长协调以提高籽棉产量而促进作物早熟，更好的铃铃保留的潜力。

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