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Recovery by Eleven Crops of Oats of Phosphorus Applied to Pot Cultures of Five Soils¹

Synopsis: Recovery of applied phosphorus by 11 oat crops ranged from 51 to 72%, and recovery by the first crop was less than 20% from the silt loams and about 35% from a sand. Total percentage of applied phosphorus recovered by cropping and acid and alkali extractions combined ranged from 74 to 100%. Phosphorus applied at 22 to 589 ppm. to Spencer silt loam gave nearly the same percentage recovery by the 11 crops.

² Respectively, Fellow in Soils, Professor of Soils, and formerly Fellow In Soils, University of Wisconsin; latter now Associate Agronomist, Agr. Exp. Sta., Blacksburg, Virginia.

Received for publication April 4, 1957.