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Factors influencing nodulation and N fixation ability of alfalfa in a simulated alfalfa/maize intercropping system
ZHAO Ya-jiao, LIU Xiao-jing, TONG Chang-chun, WU Yong
Acta Prataculturae Sinica . 2020, (1): 95 -105 .  DOI: 10.11686/cyxb2019383