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Characteristic Analysis of Soil Fertility of Alfalfa Fields in the Hilly Loess Region of South Ningxia
潘占兵 蒋齐 许浩 董立国 马璠 季波 王月玲 蔡进军
Chinese Agricultural Science Bulletin . 2011, (28): 178 -183 .  DOI: 10.11924/j.issn.1000-6850.2011-0939