关键词: 77% 乙·莠·滴异辛酯悬乳剂;, 春玉米田, 一年生杂草, 土壤封闭, 防效

Abstract: 【Objective】 In order to prevent the harm of annual monocotyledon and dicotyledon weeds from the growth and development of spring maize in the early stage,the effects of the experimental agents on annual weeds and the safety of spring maize were determined. 【Methods】 The experiment of controlling weeds in spring corn field by pre-emergence herbicide treatments was carried out with three compound herbicide 77% acetochlor·atrazine·2,4-D-ethylhexyl SE and single herbicide 900 g/L Acetochlor,38% Atrazine and 87.5%2,4-D-ethylhexyl SE.【Results】 77% ethyl ·atrazine·ethylhexyl SE of different dosage of[1 732.5,2 310.0,2 887.5,4 620.0 g（a.i）/hm²] treatment can effectively control the annual weed field of green bristlegrass,amaranthus retroflexus,and nightshade. The total plant control effect of 45 d after various treatments applying pesticide was over 96.9%,better than the control effect of each single agent,and the differences reached significant level （P<0.01）. At the same time,the yield increase of ternary mixed herbicide treatment was significant,and the yield increase was 35.4%-50.8% compared with the control treatment. There was no adverse effect on the growth of spring maize. 【Conclusion】 The ternary herbicide mixture was used for soil sealing treatment in spring corn field,and the selected dosage of 1 732.5-2 310.0 g（a.i）/hm² in the field could effectively control the monocotyledons and dicotyledons of annual weeds,avoid the competition between weeds and spring corn in the early growth stage,and achieve the purpose of cost saving and efficiency enhancement.

Key words: 77% acetochlor·atrazine·2;, 4-D-ethylhexyl SE, Spring corn field, Annual weeds, Pre-emergence herbicide treatments, Control effect