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An Evaluation of Phosphorus Fertilizers Varying in Water Solubility: III. Oat Fertilization¹

ABSTRACT

Nine field experiments were conducted in which phosphorus fertilizers differing in water solubility were compared for the fertilization of spring-seeded oats. Methods of fertilizer application were also studied in five of the experiments. The tests involved rates of 15 to 75 pounds of available P₂O₅ per acre, and were located on soils which tested low in available P and had a pH range from 5.4 to 7.9.

The reaction of the soil appeared to be the most important single factor influencing the effectiveness of P sources and their method of application. In general, the degree of P water solubility assumed most importance in the experiments located on calcareous soils, while placement effects were of greatest significance on the acid soils.

In 3 of 5 experiments located on calcareous soils, there was a definite increase in yields with increasing water solubility of the P sources. However, the data were not comprehensive enough to permit the establishment of any critical level of water solubility.

Drilling the fertilizer with the seed was significantly superior to broadcasting in the three experiments involving placement studies on acid soils. Phosphorus sources differed only slightly in effectiveness on these soils.

¹ Journal Paper No. J-3894 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1189. This work was supported in part by the Tennessee Valley Authority.

² Associate Professor, Professor, and Research Associate of Soils, respectively. The authors are indebted to Mr. W. L. Hill and associates of the Agricultural Research Service, USDA for preparing the radioactive fertilizer used in part of the work.

Received for publication June 20, 1960. Accepted for publication January 5, 1961.