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The Feeding Power of Plants for Phosphates¹

ABSTRACT

Plant species were compared as to their feeding power for both monocalcium phosphate and rock phosphate. Even after the effect of size and extensiveness of the root absorbing surface was eliminated, species differed in their capacity to absorb phosphorus from basic calcium phosphates. The phosphorus of rock phosphate was most available to buckwheat and was more available to the legumes, alfalfa, crotalaria, and ladino clover, than to the grasses, orchard grass, bromegrass, perennial ryegrass, millet and oats.

¹ Contribution of the Division of Soil and Plant Relationships, BPISAE, U. S. Dept. of Agriculture, Beltsville, Md. Presented before Division II, Soil Science Society of America, Nov. 18, 1952.

² Soil scientist. The author wishes to express his appreciation to D. H. Smith and J. M. Blume for the data presented in table 6.

Received for publication March 30, 1953.