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Soil Nitrogen Availability Indexes and Effects of Potassium Carriers and Levels of Potassium and Nitrogen Fertilization on the Yield and Quality of Sugar Beets

Gary John Gascho

出版	Thesis (Ph.D.) - Michigan State University. Department of Soil Science, 1968
URL	http://books.google.com.hk/books?id=JgYqL_29CfEC&hl=&source=gbs_api