伴地农混用防除春玉米田杂草效果评价

Effect of Bromoxynil on Controlling Weeds in Spring Corn Field

田间小区试验结果表明 ,伴地农单用对春玉米田的藜、本氏蓼、反枝苋、龙葵等一年生阔叶杂草有良好防效。伴地农与乙草胺前后搭配使用或与莠去津、康施它混用可以扩大杀草谱 ,能够有效地防除玉米田的稗草、狗尾草、藜、本氏蓼、反枝苋、龙葵等一年生禾本科杂草和阔叶杂草 ,对禾本科杂草的综合株数防效为 5 0 %～ 94 % ,对阔叶杂草的综合株数防效为 86 %～ 10 0 %。适宜的混用组合和用量为 :伴地农与乙草胺前后搭配使用 ,乙草胺播后苗前土壤处理 375 0mL hm2 ,伴地农苗后茎叶处理 15 0 0mL hm2 ;苗后茎叶处理组合 ,伴地农 +莠去津 15 0 0 + 30 0 0mL hm2 或 12 0 0 +375 0mL hm2 ;伴地农 +康施它 90 0 + 180 0mL hm2 。茎叶处理适宜施药时期为玉米 2～ 3叶期 ,禾本科杂草 2～ 4叶期 ,阔叶杂草株高 3～ 5cm。

This trial result showed that bromoxynil could effectively control broadleaf weeds in spring corn field. Grass weeds and broad-leaf weeds could be controlled effectively, such as Barnyardgrass, Bottlegrass, Bacon weed, Willowleaf knotweed, Redroot pigweed and Black nightshade, by using acetochlor at pre-germination and bromoxynil at post-germination, or mixture of bromoxynil with atrazine, bromoxynil with foramsulfuron. The control effect on the grass was 50%～94% and the broad-leaf weeds was 86%～100%. The better mixtures and suitable dosage were acetochlor+bromoxynil 3750+1500mL/hm 2, the mixture of bromoxynil+atrazine 1500+3000mL/hm 2 or 1200+3750mL/hm 2, and bromoxynil+foramsulfuron 900+1800mL/hm 2. These dosages were safe to spring corn. The optium application timing was at the stage of spring corn 2～3 leaves, grass 2～4 leaves and broadleaf weeds 3～5 cm high.