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Response of Corn in Superphosphate Placement Experiment¹

ABSTRACT

Phosphorus was placed 2, 8, 14, and 20 inches deep in Norfolk loamy fine sand and Red Bay fine sandy loam.

In dry years the deeper treatments gave significantly more corn than the shallow treatments when the surface soil had residual fertilizer phosphorus, except on the Red Bay fine sandy loam where placement in the 8-inch level gave a lower yield than the 2-inch level. This was probably because the placement was in the plow sole area which was so compact that roots could not develop. When no residual phosphorus was present on Red Bay soil, the 2-inch treatment gave the best yields. This was because there was not enough phosphorus in the surface soil to promote growth of roots to the fertilizer band and the corn receiving the deeper placements was not stimulated.

In wet years corn was able to et sufficient phosphorus from residual fertilizer to promote root penetration, and subsoiling alone was as effective in increasing corn yields as was applied phosphorus.

¹ Published with approval of the Director of the Florida Agr. Exp. Stations as Journal Series No. 698. Presented before Div. IV, Soil Science Society of America. Nov. 18, 1957, at Atlanta, Ga.

² Associate Chemist, Main Station; Vice Director-in-Charge, West Florida Station; and Soils Chemist, North Florida Station, respectively. The authors wish to thank H. L. Carver and J. R. Neller for their contributions toward this study.

Received for publication January 10, 1958. Accepted for publication March 21, 1958.