Preliminary study on nitrogen and phosphorus loss in Yellow River irrigated paddy field of Ningxia
ZHANG Xuejun, CHEN Xiaoqun, LIU Hongbin, ZHAO ying, LUO Jianhang
Ecology and Environment . 2010, (5): 1202 -1209 .  DOI: 10.16258/j.cnki.1674-5906(2010)05-1202-08

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