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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～ 12 0kg/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 2 10kg/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。
The effects of nitrogen fertilizer on the emergence and growth of three main weeds (Alopecurus japonicus Steud., Myosolonaquaticum (L.) Mocnch., Lapsana apogonoides Maxim. The impact of production. The results showed that the germination of field weeds was not affected when 30 ~ 120 kg / hm2 of basal fertilizer was applied. In the late growth stage, the total weed biomass decreased and the weed competitiveness was weakened with the increase of nitrogen application rate , Rapeseed competitiveness increased, rapeseed yield increased with the increase of nitrogen fertilizer, when the total nitrogen reached more than 210kg / hm2, the output tends to be flat; regardless of the low nitrogen or high nitrogen levels, Mother more than dicotyledonous rice cucumber, beef, etc. with more strong competition.