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减量施氮对冬小麦-夏玉米种植体系中氮利用与平衡的影响
刘学军, 巨晓棠, 张福锁
Effect of reduced N application on N utilization and balance in winter wheat-summer maize cropping system
LIU Xuejun, JU Xiaotang, ZHANG Fusuo
应用生态学报 . 2004, (3): 458 -462 .