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Nitrogen flow characteristic and use efficiency in mixed crop-livestock system in North China Plain: Hebei Jinlong Circular Agriculture Farm as an example
SHI Peng-fei, ZHENG Yuan-yuan, ZHAO Ping, YANG Dong-yu, JIA Liang, WANG Gui-yan
Chinese Journal of Applied Ecology . 2017, (4): 1281 -1288 .  DOI: 10.13287/j.1001-9332.201704.029