不同密度稗对春玉米产量的影响

Effect of Echinochloa crus-galli Densities on Spring Maize Yield

采用田间小区试验法研究14种不同密度下稗生物量的变化趋势及其对春玉米产量的影响。结果表明:在低密度下,稗生物量随着密度的变大而变大;当稗密度达到800株/m2以上时,种内竞争加剧,稗的生物量反而有所下降。在低密度下,春玉米产量损失率随着稗密度的增加基本上呈直线上升的趋势;但是当稗密度超过400株/m2后,春玉米产量损失率呈减速增加的趋势。

The interaction between biomass of Echinochloa crus-galli （L.） P.Beauv.and the yield of spring maize were investigated at 14 densities under field conditions .Both biomass of E.crus-galli and the yield loss rate of spring maize in-creased as the density of the weed increased under a low density regime .Intraspecific competition intensified and biomass of E.crus-galli decreased when the plant density was above 800 plants/m2 .However,the yield loss rate of spring maize increased more slowly when the weed density was above 400 plants/m2 .