The Application Effect Of Six Post Seedling Herbicide In Maize Field

In the background that the amount of maize is decrease,to improve the maize quality scientifically and reasonably is imminent.Weeds as the greatest harm in the process of maize grow,has caused a certain degree of influence on the yield and quality of crops,chemical control as an important means of weed control,plays an irreplaceable role,but with the increase in herbicide use,the phytotoxicity,drug resistance has become an increasingly prominent problem.This paper focuses on the effect of weed,safety of crops,and the yield and quality influence of crop casued by 25%rimsulfuron SG,75%nicosulfuron WG,40%mesotrione SC,24%nicosulfuron-atrazine OD,3 0%mesotrione-nicosulfuron-atrazine OD,52%butachlor-atrazine-mesotrione SE,aim to determine the optimal dosage of this herbicide,provide theoretical basis and practical guidance for daily production,and to ensure maize grow safety and efficiently.The tresults show that the optimal dosage of 25%rimsulfuron SG is 18.75?22.5 g a.i./hm2,30 days after,the control effect of weed number is 80.5%-88.5%,the control effect of weed fresh weight is 81.6?89.1%.The optimal dosage of 75%Nicosulfuron WG is 50.6?61.9 g a.i./hm2,30 days after,the control effect of weed number is 79.9%?89.4%,the control effect of weed fresh weight is 80.7-89.7%.The optimal dosage of 40%mesotrione SC is 120?150 g a.i./hm2,30 days after,the control effect of weed number is 83.4%?89.3%,the control effect of weed fresh weight is 83.6%?89.5%.The optimal dosage of 24%nicosulfuron-atrazine OD is 288?360 g a.i./hm2,30 days after,the control effect of weed number is 83.6%?90.9%,the control effect of weed fresh weight is 84.3-91.5%.The optimal dosage of 30%mesotrione-nicosulfuron-atrazine OD is 720?855 g a.i./hm2,30 days after,the control effect of weed number is 87.5%-92.9%,the control effect of weed fresh weight is 88.2?93.4%.The optimal dosage of 52%butachlor-atrazine-mesotrione SE is 1053?1170 g a.i./hm2,30 days after,the control effect of weed number is 87.0%?93.1%,the control effect of weed fresh weight is 7.9-92.6%.Analysis from the results of the test,it can be obtained,that all of the herbicide used in the experiment have no adverse effects on the safety and quality of maize crops.But the control effect of different hebicides on the same weeds is different,in the daily production we should selected herbicide according to the different situation,and use the optimal dosage,in order to ensure maize grow safety and efficiently.