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首页> 外文期刊>The Indian Journal of Agronomy >Crop-weed competition and weed management studies in direct seeded rice(Oryza sativa)
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Crop-weed competition and weed management studies in direct seeded rice(Oryza sativa)

机译：直播稻（Oryza sativa）的作物杂草竞争和杂草治理研究

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Field experiments were conducted during 2006-07 and 2007-08 at Krishi Vigyan Kendra, Madurai, Tamil Nadu under the Zonal Project Directorate, Bangalore to study the critical period of crop weed competition and develop an integrated and effective weedcontrol practices, combining chemical, manual and mechanical methods, for direct seeded rice (Oryza sativa L). It was found that first 40 days after sowing was the most critical period for crop weed competition. The crop grown under weed free condition for 40 days after sowing gave the maximum grain yield (2.93 t/ha). Hand-weeding followed by foliar application of urea was significantly superior to rest of the treatments and gave maximum grain (4.33 t/ha) and straw yields (8.17 t/ha). Post-emergence application of propanil @ 3.8 kg/ha at 20 days after sowing and soil application of urea was most effective in increasing the crop yield and minimizing the crop weed competition. Highest weed control efficiency of 88.1% was recorded in crop given propanil @3.8 kg/ha + hand weeding within rows and hoeing at 40 DAS and it closely followed by the application of butachlor @ 2.5 kg/ha + hand weeding within rows and hoeing at 40 DAS. In the integrated approach, post-emergence application of propanil @ 3.8 kg/haat 20 days after sowing followed by hoeing between the rows and hand weeding within rows at 40 days after sowing minimized crop weed competition, increased uptake of N, P and K by crop and maximized grain yield and economical returns significantly.
机译：在2006-07年和2007-08年间，在班加罗尔Zonal项目管理局的泰米尔纳德邦Madurii的Krishi Vigyan Kendra进行了田间试验，研究农作物杂草竞争的关键时期，并结合化学，人工研究了综合有效的除草方法和机械方法，用于直播水稻（Oryza sativa L）。人们发现，播种后的前40天是作物杂草竞争的最关键时期。播种后在无杂草条件下生长40天的农作物获得最大的谷物产量（2.93吨/公顷）。人工除草后再叶面施用尿素明显优于其余处理，并获得最大谷物（4.33吨/公顷）和秸秆产量（8.17吨/公顷）。播种后20天，出苗后施用3.8 kg / ha的丙烷和土壤施用尿素对提高农作物产量和最大程度减少农作物杂草竞争最为有效。在40 DAS下，丙胺@ 3.8 kg / ha +行内除草并除，在作物上记录的最高杂草控制效率为88.1％，紧随其后的是丁草胺@ 2.5 kg / ha +行内除草并at除在at田。 40个DAS。在综合方法中，在播种后20天以每公斤3.8千克/公顷的芽后施用丙腈，然后在播种后40天行间between和行间除草，从而最大程度地减少了作物杂草竞争，增加了N，P和K的吸收作物，最大程度地提高了谷物产量和经济效益。

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