Field Efficacy of a Corn Herbicide,Jinlongyu

HOU Wenbang; ZHOU Lu; ZHOU Haoran

doi:10.15933/j.cnki.1004-3268.2015.01.016

Abstract：In this experiment, Zhengdan958, a common maize variety was used as material to test the control effect of different dosages( low dose,750 g/ha;middle dose,1 049 g/ha;high dose,1 349 g/ha;fold amount dose,2 099 g/ha) of Jinlongyu,a new type herbicide containing nicosulfuron,atrazine and MCPA,on cornfield weeds. The results showed that Jinlongyu could quickly control dicotyledonous weeds, and the quantity control efficiency reached 79. 71%—85. 63% 7 d later,while to monocot weeds, it had a long control duration, with the quantity control efficiency of 79. 67%—94. 92% 28 d later. The control efficacy for weeds quantity and fresh weight increased with the use of pharmaceutical dosage increasing. To the total weeds, 28 d after spraying, the fold amount treatment had a quantity control efficiency of 94. 53%,significantly higher than that of the low-dose treatment (78. 63%);the fresh weight control effi-ciency of all the treatments were more than 95 . 32%. The same treatment for different weeds showed dif-ferent control effect,the most sensitive species were dicot weeds,followed by barley grass,green foxtail, barnyard grass,and crabgrass was the most insensitive. After spraying the herbicide,corn showed a slight twist,but its production was not affected, which of all the treatments (8 247,9 243,9 836,9 465 kg/ha for the low dose,middle dose,high dose and fold amount dose treatments,respectively) were significantly higher than CK (6 761 kg/ha) ,indicating that Jinlongyu was safe for maize and had a yield increasing effect. The middle dose and high dose are recommended in prevention of cornfield weeds in production.