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An Evaluation of Phosphorus Fertilizers Varying in Water Solubility: II. Broadcast Applications for Corn¹

ABSTRACT

Sixteen field experiments were conducted, in which two or more phosphorus fertilizers differing in water solubility were compared in broadcast applications for corn. The tests involved rates of 20 to 80 pounds of available P₂O₅ per acre, and were located on soil types which tested low in available P and had a pH range from 5.5 to 7.1.

Increasing the rates of applied P₂O₅ increased the P content of corn leaf samples taken at silking time, but the degree of water solubility of the P significantly influenced leaf P levels in only 1 of 11 experiments sampled. Grain yields were also increased by P₂O₅ rates but were not significantly affected by the sources of P at any of the test sites. Highly water-insoluble sources tended to be slightly less effective in a few of the experiments.

The general conclusion was that on the soils included in the study the degree of water solubility of the P was not an important factor in determining the effectiveness of fertilizers broadcast and plowed under for corn.

¹ Journal Paper No. J-3614 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1189. This work was supported in part by the Tennessee Valley Authority, the Olin Mathieson Chemical Corporation, and the Davison Chemical Corporation.

² Associate Professor and Professor of Soils, respectively.

Received for publication April 1, 1959. Accepted for publication May 25, 1959.