Journal of Northern Agriculture ›› 2015, Vol. 43 ›› Issue (5): 28-28.
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NIE Dahang, LIANG Qing, CHEN Leilei, YUAN Xijun, YU Ning (1.Soil and Fertilizer Station of Chifeng City, Chifeng 024000,China; 2.Chifeng Environmental Monitoring Central Station, Chifeng 024000,China; 3.Fushun Normal College, Fushun 113122, China)