摘要
在北京、烟台地区大田条件下研究了夏玉米田杂草治理的生态经济阈值,建立了夏玉米产量损失率与杂草密度的关系。结果表明,杂草与夏玉米的竞争随其密度增加而加剧,夏玉米产量逐渐下降,当杂草密度达到200株/m^2时,夏玉米产量损失率达53.07％。华北地区夏玉米田杂草治理的生态经济闽值为4.21～6.91株/m^2,即当杂草密度低于生态经济阈值时,对玉米产量的影响很小,可任其生长;高于生态经济阈值时则应及时有效地防治。
The ecoeconomic threshold for controlling weeds in the field of summer maize in Beijing and Yantai regions has been investigated. The mathematic relationship between the loss rate of maize yield and weed density is established. The results show that,with the increase of weed density,the competition between weeds and maize becomes intense,and maize yield decreases slowly. When weed density is 200 plants per square meter,the loss rate of maize yield is 53. 07 percent. The results also show that the ecoeconomic threshold for weed-controlling in the field of summer maize in the North China is 4. 21-6. 91 plant/m2,namely,weeds could grow freely when they are under the threshold and the influence on maize yield is quite little. However,as to weeds which are over this threshold,timely and effective measures for controlling weeds should be necessary.
出处
《生态农业研究》
CSCD
1999年第3期22-24,共3页
Chinese Journal of Eco-agriculture
基金
"九五"国家科技攻关项目
关键词
夏玉米
杂草
生态经济阈值
Summer maize, Weed,Ecoeconomic threshold
