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Studies on Nitrification and Its Relation to Crop Production on Carrington Loam Under Different Treatments

Bernard Wernick HammerCharles Webster KnoxEarl WeaverFrederick Burean SmithLewis Wilson ErdmanOscar Wallace ParkJohn A. HopkinsCharles Arthur MatthewsH. A. BittenbenderKnute BjorkaMerle P. Baker

出版	Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts, 1926
URL	http://books.google.com.hk/books?id=qd9QAQAAMAAJ&hl=&source=gbs_api