Effects of different farming systems on nitrogen and phosphorus loss from surface runoff in purple hilly region in Sichuan
YANG Haoyu, ZHAO Xiaorong, ZENG Xiangzhong, PU Bo, WANG Changtao
Ecology and Environment . 2009, (6): 2344 -2348 .  DOI: 10.16258/j.cnki.1674-5906(2009)06-2344-05

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