高粱播后苗前和苗后除草剂的初步筛选

Screen of Herbicide Applied after Sowing and before Emergence and after Emergence of Sorghum

高粱＂赤杂28＂苗前封闭使用3种除草剂,1种复配剂;苗后茎叶使用2种除草剂,1种复配剂。通过对田间杂草防效和＂赤杂28＂产量的对比与分析,选出能有效防除杂草又保证＂赤杂28＂正常生长的除草剂。结果表明,播后苗前每667 m2使用129.2 m L 72%异丙甲草胺复配323 m L 38%莠去津封闭喷雾,出苗后于高粱2~4叶期每667 m2使用38%莠去津323 m L喷雾,以上2种方法可安全用于高粱杂交种＂赤杂28＂的杂草防治。

Three kinds of herbicides and a compound agent was applied before emergence of Sorghum ＇Chiza 28＇ and two kinds of herbicides and a compound agent was applied after emergence. Herbicides which had effective weed controlling and ensure a normal growth of ‘ Chiza 28＇ were selected by comparison and analysis of weed control effect and yield of grains. The results showed that after sowing and before emergence, 129.2 mL of 72% ISO - Propylene compound and 323 mL 38% Atrazine per 667 m2 can be used for closed spray, and after emergence and in 2 - 4 leaf stage 323 mL of 38% atrazine per 667 m2 can be applied. The above two methods are safe for weed controlling of sorghum hybrid‘ Chiza 28＇