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Effect of N Fertilization on Grain Yield of Winter Wheat and Apparent N Losses[J]. CUI Zhen-Ling,CHEN Xin-Ping,LI Jun-Liang, XU Jiu-Fei, SHI Li-Wei and ZHANG Fu-Suo College of Resources and Environmental Science, China Agricultural University, Beijing 100094 (China). Department of Agronomy, Laiyang Agricultural College, Laiyang 265200 (China).Pedosphere. 2006(06)