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Response of alfalfa and smooth brome to nitrogen fertilizer in monoculture and mixed grasslands
XIE Kai-yun,LI Xiang-lin,HE Feng,WAN Li-qiang,WANG Dong,QIN Yan,YU Qun
Acta Prataculturae Sinica . 2014, (6): 148 -156 .  DOI: 10.11686/cyxb20140619