乙草胺玉米苗后除草技术田间试验研究

STUDY ON WEEDING TECHNIQUE OF ACETOCHLOR APPLIED IN POST - EMERGENCE PERIOD OF MAIZE

为了明确乙草胺玉米苗后化学除草对玉米的安全性及除草效果,进行了乙草胺玉米苗后不同生育期除草试验。结果初步表明玉米播后苗前和玉米4叶1芯期以前喷施50％乙草胺乳油1500、2250、3000ml/hm^2对玉米均有轻微的灼烧状接触性药害,但未发现玉米有抑制生长、畸形或黄化等其它药害现象,且不影响后期新生叶片。比空白对照增产2.84％～10.35％,比人工除草减产4.79％～10.70％。玉米2叶1芯期,马唐3叶1芯,反枝苋4叶期前施药,对杂草具有较好的防除作用。

In order to test the weeding effect and the safety for maize, the weedcide Acetochlor was applied in different developments stages of maize after the seedling emergence. The results showed that it produced light contacting injury to maize plants under 1500,2250 and 3000ml/hm2 of 50% Acetochlor emulsion were applied, Houwgver it was not found that this weedside has growth - inhibiting effects or produced mosouic symptoms. The late grouth of maize leaf was also not affected,The yield was increased by2.84% ~ 10.35% than that of CK and decreased by 4.79% ~ 10 .7% than that of artificial weeding. The results also showed Acetochlor had good weeding effict when it was applied in the period before 3 leaves.