1. Four kind of weedkillers, napropamide WP 50%, Dual Gold 96%, Trifluralin 48% and Nitrofen 50%, have been used for killing weeds on the flue cured tobacco seedbed. 用50%敌草胺WP、96%金都尔、48%氟乐灵、50%除草通4种除草剂对烤烟苗床杂草进行除草试验。