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Nitrogen and phosphorus ecological stoichiometry in different-aged alfalfa stands in southeast Shandong
WANG Hui, MIAO Fu-Hong, SUN Juan, LIU Hong-Qing, YANG Guo-Feng
Acta Prataculturae Sinica . 2017, (8): 216 -222 .  DOI: 10.11686/cyxb2016436