Research On Corn Chemical Herbicide In Sunwu County Of Heilongjiang Province

In view of the existing post-emergence herbicide in the field of corn field,the author summarized and analyzed the existing phytotoxicity problems,efficacy problems,precautions of using corn herbicide,the using principle and the mixed precautions.In addition,our county maize field weeding more than weeding,the main agents are nicosulfuron-atrazine,mesotrione-atrazine,nicosulfuron-mesotrione-atrazine and oxazole Keto-Atrazine-based Herbicide closure in our county is relatively less.Due to years of repeated use of nicosulfuron-atrazine,mesotrione-atrazine and other herbicides to weeds such as crabgrass,Setaria viridis and other gradual generation of resistance,resulting in increased dosage but control effect decreased The problem.Sunwu County soil a total of eight soil types,sub-27 sub-categories,31 soil genus,52 soil species.There are dark brown soil and black soil two zonal soil.Dark brown soil is the main forest soil in the area.Black soil is the main cultivated soil in the area,mainly distributed in the diffusing area of hills in front of Xiaoxing’an Mountain.Three experimental sites were selected in each region of Sunwu County,the crop was corn,and the variety was Demeiar 2.Selection and site selection Flat topography,deep fertile soil fertile,water and fertilizer performance,no residual injury,drainage good Ridge 0.67,mechanical sowing.The spraying time is 3-5 leaves of corn,2-3 weeds of weeds and 2-4 leaves of broadleaf weeds(2-5 leaf stage of weeds).The whole growth period only 1 herbicides,playing drugs,the weather was fine,no wind.Further investigating the efficacy of herbicides,safety issues and the impact on maize itself.The above several post-emergence herbicides systematic experimental analysis and summary,so that farmers can be more effective and safe to use,indirectly increase corn yield.The use of 24 % nicosulfuron-atrazine would indirectly affect the growth of corn,which was lower than the other treatments but higher than the blank control.55 % Mesotrione-Atrazine at 3d corn white albino phenomenon,7d turn back the color and had no effect on the growth of corn(same height),but less effective against Setaria viridis.Oxymatrine 30 %,herbicidal effect and safety better than other herbicides,farmers are advised to use 30 % oxacitone.