几种除草剂在直播芹菜田的应用技术研究

为筛选适合芹菜直播田使用的除草剂，进行了3种除草剂在直播芹菜上的田间药效试验。试验结果表明．播种当天施药，各药剂的株防效均较好，但对芹菜成苗影响较大；播前3d施药，48％氟乐灵乳油表现出较好的安全性和除草效果，其中，120mL／667m2处理的成苗率接达96．42％，僵苗率仅0．04％，对禾本科杂草的株防效高达98．51％，对双子叶杂草的株防效接近70％；播前7d施药，3种药剂均表现出良好的安全性和除草效果，仅96％精一异丙甲草胺乳油各处理的安全性相对稍差。因此，直播芹菜田应用除草剂时，在播前3—7d用药较为合适。

Research on Application Technology of Herbicides on Direct-seeded Celery Filed

In order to screen out suitable herbicides for direct-seeded celery field, we studied the control efficiencies of three herbicides. The results showed that, while were applied on the day of sowing, all the three herbicides had higher control efficiency but affected the seedling emergency of celery. When was applied three days before sowing, the herbicide 48% trifluralin emulsifiable concentrate （EC） possessed excellent safety and control effect, with the dosage of 120 mU667 mE, the relative seedling emergence rate was 96.42% with the adjusted runt seedling rate of only 0.04%, and its control efficiencies were 98.51% and 68.68% on gramineous weeds and broadleaf weeds respectively. When were applied seven days before sowing, all the three herbicides had higher control efficiency, but the herbicide 96% smetolachlor EC had relatively poor safety. Therefore, the herbicides should be applyed 3-7 days before sowing for enhancing the safety of direct-seeded celery.