6ZHANG Huimin, XU Minggang, ZHANG F.Long-term effects of manure application on grain yield under different cropping systems and ecological conditions in ChinaEJ~.The American Journal of Anatomy,2009,147(1) :31-42.
7HJ55—2010,化肥使用环境安全技术导则[S].
8环境保护部.第一次全国污染源普查畜禽养殖业源产排污系数手册[R].北京:环境保护部,2007.
9ROTZ C A.Management to reduce nitrogen losses in animal production[J]. Journal of Animal Science, 2004,82 (Supple- ment 1) :Ellg.
