助剂HA对玉米田茎叶处理除草剂活性的影响

通过对玉米田茎叶处理除草剂烟嘧磺隆、硝磺草酮、唑嘧磺草胺、唑草酮和噻吩磺隆等与不同用量HA桶混使用效果的测定,初步明确了上述除草剂推荐剂量下对玉米田主要杂草的生物活性以及HA对其活性的影响,除烟嘧磺隆外,硝磺草酮、唑嘧磺草胺、唑草酮及噻吩磺隆等除草剂推荐剂量苗后单独使用对已萌发的稗草、牛筋草控制效果不理想,药后30 d生物量积累的控制效果低于70%。0.2%HA显著提高了硝磺草酮的除草活性,药后30 d对杂草生物量积累的控制效果较硝磺草酮单独使用提高10%~50%,有助于降低硝磺草酮的使用量。

Effects of Adjuvant HA on Activities of Post- Emergence Herbicides in Corn Field

Experiments have been conducted to examine the efficiency of the tank mixture of some post-emergence herbicides and adjuvant HA.The results indicated that the bioactivity effects of nicosulfuron,mesotrione,flumetsulam,carfentrazone-ethyl,thifensulfuon-methyl and the adjuvant HA,at a recommended dosage respectively,on main weeds in corn field could be determined and discussed.Mesotrione,flumetsulam,carfentrazone-ethyl and thifensulfuon-methyl applied at post-emergence alone could not presenta desirable inhibition on the biomass accumulation of barnyard grass Echinochloa crusgalli（L.） Beauv.] and goose grassEleusine indica（Linn.） Gaertn.] at the recommended dosage respectively.Efficiency for control of weeds biomass accumulation was below 70% after 30 days for herbicide application.But the HA could significantly increase the herbicidal activity of mesotrione on above weeds at 0.2%concentration.The inhibitory efficiency of mesotrione plus HA on weed biomass accumulation increased 10%~50% compared with mesotrione alone,which would beneficial to reduce the mesotrione application dosage.