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The Selection of Suitable Variety and Proper Fertilization of Alfalfa（Medicago sativa L.） in the Semiarid Area in North China
段玉 曹卫东 妥德宝 赵沛义 李焕春 姚俊卿 付贵锁
Journal of Northern Agriculture . 2010, (
1
): 52 -52 .
