All additives except for urea can inhibit the production of ammoniacal nitrogen, butyric acid and the decomposition of protein during silage secondary fermentation, but the effects on pH were differing. 除尿素外的所有添加剂处理均可抑制青贮二次发酵过程中氨态氮的产生,抑制蛋白降解及丁酸的产生,但对pH值的影响效果不一。