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氮肥用量对三种杂草与油菜间竞争关系的影响

DOI: 10.7685/j.issn.1000-2030.2000.01.006, PP. 23-26

Keywords: 氮肥,杂草群落,油菜,竞争

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Abstract:

通过田间不同施氮量处理探明氮肥对油菜田3种主要杂草(日本看麦娘AlopecurusjaponicusSteud.,牛繁缕Myosolonaquaticum(L.)Mocnch.,稻搓菜LapsanaapogonoidesMaxim.)的出苗、生长过程及油菜产量的影响。结果表明在基肥施氮量(N)30~120kg/hm2时,田间杂草的萌发不受影响;生长后期,随着氮肥用量的增加,总体杂草生物量下降,杂草竞争力减弱,油菜竞争力增强,油菜产量随氮肥量的增加而递增,当总氮量达210kg/hm2以上时,产量趋于平缓;无论在低氮或高氮水平下,单子叶杂草日本看麦娘比双子叶杂草稻搓菜、牛繁缕等具更强的竞争力。

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