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Nitrogen fertilizer effects on a 15 year old mixed species alpine pasture after two years
CAO Wen-Xia, LIU Hao-Dong, LI Wen, XU Chang-Lin, LI Xiao-Long, SHI Shang-Li
Acta Prataculturae Sinica . 2015, (9): 130 -137 .  DOI: 10.11686/cyxb2015007