Effectiveness of Three Herbicides and Herbicide Film Combinations for Weed Control in Tobacco Fields
In order to screen efficient and safe weed control methods in tobacco fields,three kinds of herbicides and herbicide film combinations were tested for weed control effects in tobacco fields in Guangxi tobacco area.The results show that the 50%trichlorfon wettable powder has better total preventive effect on the number of weed plants,and the preventive effect is 59.3%and 89.94%at 30 d and 45 d after application,respectively;Isopropyl metolachlor emulsifiable concentrate has the best total preventive effect on the fresh weight of weeds,and the preventive effect is 89.47%at 45 d after application;The preventive effect of black film on the fresh weight and the number of plants of weeds is significantly higher than that of white film and bicolour film,but there is no significant difference between white film and bicolour film,and their preventive effects are not good,which are only about 30%.In the treatment group covered with black film,the growth of tobacco leaves is poor and there is an obvious burning phenomenon,so the black film is not suitable for Guangxi tobacco area.In the treatment group combined with herbicide and film,the preventive effect of the 50%diquat wettable powder + two-colour film is the highest;the total preventive effect on weed fresh weight is 83%,and the total preventive effect on the number of plants is 83.26%in the 45 d period after the drug is administered.
万方数据
维普
