1997～2001年,采用大田试验与室内生物测定相结合的方法,就麦秸覆盖与苗后除草剂减量施用相配合对免耕玉米田杂草的控制作用及机理进行了研究。结果表明:玉米播种后田间采用麦秸覆盖可在一定程度上控制杂草的发生。当麦秸覆盖量为4500～7500kg/hm2时,玉米田杂草密度比不覆盖的处理降低49 1%～96 1%,在这样的小区除草剂采用定向喷雾,即使苗后茎叶处理除草剂玉农乐和阿特拉津的用量比常规用药量减少1/4时,小区内除草效果仍可以达到91 8%～94 3%。 From 1997 to 2001, the control effect and mechanism of weed control on no-tillage corn field were studied by using the combination of field experiment and indoor bioassay. The results showed that weeds could be controlled to a certain degree by using wheat straw after field sowing. When wheat straw coverage was 4500 ~ 7500kg / hm2, the density of weed in corn field was reduced by 49 1% ~ 96 1% compared with uncoated treatment. Directional spraying was applied to such herbicides in this plot, When the amount of agronomic and atrazine was reduced by 1/4 compared with the conventional dosage, the weeding effect in the plot could reach 91.8% ~ 94.3%.