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施用硫肥对几种作物与牧草产量和硫素含量的影响
崔岩山, 王庆仁
Effect of sulfur fertilization on yield production and sulfur content of crops and pasture in north China
CUI Yanshan, WANG Qingren
应用生态学报 . 2003, (8): 1261 -1264 .