Abstract: Field experiments were conducted to analyze the control eftect of pendimethalin mixed with prometryn on weeds and its safely tor the growth with 4 varieties of mung beans. The results showed that the combination of pendimethalin and prometlTn can eftectively control the main annual weeds in mung bean fields, and the total control eftect of weeds was more than 85%. The mixed use of pendimethalin and prometryn had no detrimental eftects on the growth of 4 varieties of mung beans （Jilv 7, Bailv 8, Kelv 1 and Mengqing）. There were no significant eftects on the seedling numbers, plant height, root fresh weight, fresh weight of upper ground of early flowering period, the index plant height, pods per plant, pod length, grain number per pod, 100-grain weight or yield of harvest time of mung bean. The combination of pendimethalin and promemy-n can be used for mung bean field weed management. The appropriate dose was found to be pendimethalin 600 g/hm^2 and prometryn 300 g/hm^2.

Key words: Pendimethalin;Prometryn;Mung bean;Control ettect;Safety