Carbon-nitrogen fixation and effects on the physical and chemical properties in winter cover crop in north China
ZHAO Qiu, GAO Xianbiao, NING Xiaoguang, CAO Weidong
Ecology and Environment . 2011, (4): 750 -753 .  DOI: 10.16258/j.cnki.1674-5906(2011)04-0750-04

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