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The Effect of Cropping System, Fallow Method and Fertilizers on Crop Yields and Soil Properties of Southeastern Colorado Soils

Albert Gail MadsenAlexander Daniel DotzenkoCharles Richard CreekCharles W. RobinsonJohn Conrad HoffK. G. BrengleKenneth C. NobeRex D. RehnbergRobert E. MorengJames M. Turner

出版	Colorado State University Experiment Station, 1967
URL	http://books.google.com.hk/books?id=-P1RAQAAMAAJ&hl=&source=gbs_api