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大豆科学  2008 

窄行平作密植大豆田杂草的危害特点

DOI: 10.11861/j.issn.1000-9841.2008.03.0536

Keywords: 窄行平作密植,大豆,杂草危害

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Abstract:

化学除草是窄行平作密植大豆田唯一的杂草防除方式,草害水平和除草时期将直接影响化学除草的经济效益。研究不同杂草发生密度及与大豆共生时期对窄行平作密植栽培模式下大豆产量的影响,以明确窄行平作密植大豆田杂草化学防除的适宜时期和草害水平,提高化学除草的效益。利用对角线五点取样法,调查了窄行平作密植大豆田杂草的危害特点。结果表明:野燕麦发生密度(x)与大豆收益(y^)之间的曲线关系为y^=2267.2Ln(x)-4934.2,野燕麦的理论密度阈限为10.75株.m-2;苍耳发生密度为6株.m-2时,与大豆全生育期共生使大豆减产61.1%。

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