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Comparison of Methods for Estimating Available Phosphorus in Alkaline Calcareous Soils

Roy Douglas HockensmithJames Bennett GoodwinRobert GardnerColorado Agricultural Experiment Station

出版	Colorado Agricultural College, Colorado Experiment Station, 1933
URL	http://books.google.com.hk/books?id=x600zgEACAAJ&hl=&source=gbs_api