氰氟草酯4种剂型防除直播稻田禾本科杂草的活性比较

Herbicidal Activities for Four Formulations of Cyhalofop-butyl to Control Gramineous Weeds in Direct-seeding Rice Field

为了比较除草剂氰氟草酯乳油、可湿性粉剂、可分散油悬浮剂、水乳剂等4种剂型的除草活性,为选择环境友好型剂型提供依据,参照GB/T 17980.40–2000进行了田间除草活性比较。结果表明,氰氟草酯4种剂型在90 g/hm2剂量下对直播稻田禾本科杂草均有较好的防除效果,15,30,45 d的总杂草株防效分别为85.36%～91.48%,87.39%～92.86%,87.96%～92.78%,45 d鲜重防效达90.06%～94.01%,增产幅度为8.60%～12.07%。4种剂型的除草效果从低到高依次为可湿性粉剂、乳油、可分散油悬浮剂、水乳剂。氰氟草酯最好加工成水乳剂、可分散油悬浮剂等环境友好型剂型。

In order to select environment-friendly formulations of cyhalofop-butyl from four types,such as emulsifiable concentrate（EC）,wettable powder（WP）,dispersible oil miscible flowable concentrate（DOF） and emulsion in water（EW）,their herbicidal activities were compared in direct-seeding rice field with the method of GB/T 17980.40–2000.The results showed that all four formulations of cyhalofop-butyl had excellent herbicidal activities at the dosage of 90 g/hm2.The plant effects of 15,30,45 d were 85.36%-91.48%,87.39%-92.86% and 87.96%-92.78%,respectively.The fresh weight effects of 45 d were 90.06%-94.01% and the range of increase production was between 8.60% and 12.07%.The four formulations of cyhalofop-butyl from low herbicidal activity to high were WP,EC,DOF and EW.Cyhalofop-butyl EW and DOF were recommended because they were environment-friendly.