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在陕西省重点夏玉米生产县(市)选择有代表性的110块玉米田进行杂草调查,已鉴定出夏玉米田杂草29种,隶属15科。其中优势种群为马唐、狗尾草、铁苋菜,个别地方莎草相当严重,已成为玉米田内难以根除的恶性杂草。玉米播种后10～15d为出草高峰期,播后苗前施药是进行化学防除的关键时期。
We selected 110 representative maize fields from key summer maize producing counties (cities) in Shaanxi Province to conduct weed surveys, and 29 species of weeds in summer maize fields were identified, belonging to 15 families. Among them, the dominant populations were Crabgrass, Setaria viridis and Euglena amabilis, and the sedge in some places was quite serious. It has become a malignant weed that is difficult to eradicate in the corn field. Corn sowing 10 ~ 15d after the peak for the season, after sowing before spraying is a key period for chemical control.