影响烟嘧黄隆药效的因素

FACTORS INFLUENCING EFFICACY OF NICOSULFURON ON CRABGRASS (DIGITARIA SANGVINALIS)

室内盆栽试验表明,烟嘧黄隆的药效受杂草叶龄、助剂及施药与降水间隔时间的影响。从玉米田马唐防除的生态经济阀值和不同叶龄防效的综合结果看,以马唐3叶期后至5叶期前喷施36g/hm^2的烟嘧黄隆效果最好。非离子型表面活性剂吐温20、OP-10、平平加15和阴离子型表面活性剂洗衣粉都能显著提高烟嘧黄隆对马唐的防效,增效幅度在28.6％～52.7％。渗透剂T和YZ-901不能显著提高烟嘧黄隆的药效。施药后与降水的间隔时间越短,防效降低得越多。本试验结果表明,药后8h不遇降水方可保证药效的充分发挥。

Experiments conducted in greenhouse showed that the efficacy of nicosul-furon on crabgrass was affected by weed size, surfactants and rain interval. Results indicated that crabgrass control decreased dramatically at 7-leaf stage. According to the eco - economic threshold of crabgrass control in corn, treatment with nicosulfuron should be carried out under the dosage rate of 36g/hm2 during 3 through 5 leaf stage. The activity of nicosulfuron varied with surfactant. Tween20, OP-10, APE-15 and washing powder increased control efficacy on crabgrass, and the increment ranged from 28. 6% to 52. 7%, but Penetrator-T and YZ-901 did not affect the efficacy. To achieve higher efficacy must not be shorter than 8 hours after treatment, the rain interval after treatment influenced nicosulfuron activity.