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Change in Farmland soil Fertility and Nutrient Management Strategy in the Semiarid Regions of North China——As a Case of Xinfu County of Shanxi Province
孙树荣 董文旭 胡春胜 杨萍果 周进才
Chinese Agricultural Science Bulletin . 2012, (27): 87 -93 .  DOI: 10.11924/j.issn.1000-6850.2011-3262