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Reasons of Grain Yield Increase Per Unit Area in Heilongjiang Province
Jiao Jiang,Xiang Hongtao,Wang Lizhi,Jiang Lixia,Wang Lianmin and Li Zhongjie
Chinese Agricultural Science Bulletin . 2015, (36): 113 -118 .  DOI: 10.11924/j.issn.1000-6850.casb15060144