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草地学报  2015 

黄花草木樨对杂草的化感作用研究

DOI: 10.11733/j.issn.1007-0435.2015.01.013, PP. 82-88

Keywords: 黄花草木樨,水浸提液,干草粉,杂草,抑制

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Abstract:

为探讨黄花草木樨(Melilotusofficinalis)水浸提液对田间常见杂草的化感抑制作用以及利用黄花草木樨化感作用进行生物除草的可行性,采用生物检测法研究黄花草木樨水浸提液对藜(Chenopodiumalbum)、臭草(Melicascabrosa)、籽粒苋(Amaranthushypochondriacus)、稗草(Echinochloacrus-galli)、萹蓄(Polygonumaviculare)、山苦荬(Ixerischinensis)、车前草(Plantagoasiatica)等7种杂草种子萌发和幼苗生长的化感效应;同时测定黄花草木樨干草粉对田间杂草生物量的抑制效应.结果表明黄花草木樨茎叶水浸提液处理能显著抑制籽粒苋、山苦荬、藜、稗草及车前草的种子萌发(P<0.05);能显著抑制藜、籽粒苋、稗草、山苦荬、车前草的幼苗生长(P<0.05);黄花草木樨干草粉能有效降低田间杂草生物量,且对田间杂草的抑制效应随施用量的增加而增强,在施用量达90g·m-2时,对田间杂草数量和干重的抑制均达到显著水平(P<0.05).因此,黄花草木樨的抑草能力具有选择性,对不同种杂草的作用方式和作用强度存在差异;黄花草木樨干草粉的施用量在90g·m-2及以上时,能显著降低田间杂草的数量及重量.

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