The results of field trail indicated that inhibition rate of the metabolite of Z_0 strain against barnyard grass(Echinoc田间试验结果表明,Z0菌株代谢产物对稗、狗尾草、铁苋菜的防治效果均在80%以上,抑制率分别为80. 0%,8.9%和88.7%。