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Studies of Phosphorus Availability in Organic Soils¹

ABSTRACT

Experiments were conducted on the phosphorus status of organic soils by correlating the phosphorus solubility in various extractants with percentage yields of tomato, peppermint, and onion. Seven different extractants, including water, were compared using four ratios of soil volume to extractant volume. Distilled water extracts gave the most accurate estimates of plant-available phosphorus in a ratio of soil volume to extracting solution of 1:20 for the organic soils and 1:10 for the mineral soil.

The threshold value at which yields were not increased with additional applications of phosphorus under greenhouse conditions was established at 10 and 16 pounds per acre of water-soluble phosphorus when the soil and the water was shaken for 2 minutes and 30 minutes, respectively.

¹ Journal Paper No. 1199, Purdue University, Agr. Exp. Sta., Lafayette, Indiana.

² Graduate Student, Professor, and Assistant Professor of Horticulture, respectively. Senior author is now Horticulturist, J. W. Davis Company, Terre Haute, Indiana.

Received for publication December 16, 1957. Accepted for publication March 13, 1958.