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An Evaluation of Ten Phosphorus Sources by Growth of Four Field Crops¹

Synopsis: Corn, peanuts, oats, and soybeans responded somewhat differently but in general phosphorus sources could be arranged in the following descending order of response: superphosphate, dinitra phosphate (17-22-0), fused tri-calcium phosphate (<40 mesh), dinitra phosphate (17-33-0), fused tri-calcium phosphate (<10 mesh), concentrated superphosphate, calcium metaphosphate, potassium metaphosphate, and rock phosphate. Basic slag was also tested but rates of application were higher.

² Associate Soils Chemist, Main Station and Vice-Director-in-Charge, West Florida Exp. Sta. of Fla. Agr. Exp. Stations. The authors are indebted to the Tennessee Valley Authority, Wilson Dam, Alabama, for supplying some of the phosphorus sources and much of the chemical data in table 1, the U.S.D.A. at Beltsville for furnishing the P³² tagged fertilizer and H. L. Carver and J. R. Neller of Fla. Agr. Exp. Sta. for assistance.

Received for publication May 2, 1957.