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Comparison of Methods for Estimating Available Phosphorus in Alkaline Calcareous Soils

Carl RohwerFranklin Thomas CowanJames C. FosterMark Alfred BarmoreDavid Wield RobertsonCarey Eugene VailEarl DouglassJames Bennett GoodwinJustice Conrad WardGeorge Anderson BeachGeorge Warren DemingJoseph William TobiskaRobert GardnerRoy Douglas HockensmithAlvin Kezer

出版	Colorado Agricultural College, Colorado Experiment Station, 1932
URL	http://books.google.com.hk/books?id=krxQAQAAMAAJ&hl=&source=gbs_api