玉米地化学除草试验研究

Selection of Chemical Herbicides and Its Application Technique in Maize Field

用芽前处理药剂和苗后茎叶处理药剂对玉米地杂草防除试验。96%金都尔EC、50%乙草胺EC、50%丁草胺EC播后苗前土壤处理防除玉米地禾本科杂草防效较好,对阔叶杂草防效较差,田间用药量以72 g(a.i.)/667m2、50 g(a.i.)/667m27、0 g(a.i.)/667m2为佳。25%宝成DF、4%玉农乐RS茎叶喷雾能有效防除玉米地禾本科杂草和阔叶杂草,田间用药量以1.125 g(a.i.)/667m22、.6 g(a.i.)/667m2为佳。

5 different chemical herbicides were tested before the germination of maize seeds and at maize seedling period to investigate the weeding effect in maize field. The results indicated that 96% Metolachlor EC, 50% Acetochlor EC and 50% Butachlor EC all had the better effect of controlling grassy weeds and bad effect of controlling hardwood weeds when these herbicides were applied before the germination of maize seeds, and the optimum application amount of 96% Metolachlor EC, 50% Acetochlor EC and 50% Butachlor EC was 72 g（a. i. ）/667m^2, 50 g（a. i. ）/667m^2 and 70 g（a. i. ）/667m^2 respectively. 25% Rimsulfuron DF and 4% Nicosulfuron RS could effectively control grassy and hardwood weeds in maize field when the chemical herbicides was sprayed at maize seedling period, and the optimum application amount of 25% Rims ulfuron DF and 4% Nicosulfuron RS was 1. 125 g（a. i. ）/667m^2 and 2.6 g（a. i. ）/667m^2 separately.