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Crop Response to Metaphosphate Fertilizers¹

ABSTRACT

Results of tests with metaphosphate fertilizers were summarized for the 1936–54 period. These included 1,092 tests with calcium metaphosphate (CMP) and 175 tests with potassium metaphosphate (KMP) on acid to neutral soils, and 82 tests with CMP on alkaline soils. Only results of tests were included in which a significant yield response to phosphorus was obtained. On acid to neutral soils, CMP compared favorably with concentrated superphosphate (CSP) on corn, small grain, forage, cotton, and tobacco crops but was slightly inferior on potato and vegetable crops. KMP was also an excellent source of phosphorus for corn, cotton, small grain, and forage crops. Liming acid soils had the same effect in increasing yields with CMP as with CSP. There was no appreciable advantage from the standpoint of crop production in grinding CMP finer than to pass a 10-mesh screen. CMP was, in general, a satisfactory source of phosphorus for alfalfa and other hay grown on calcareous soils but was usually poorer than CSP for potatoes, sugar beets, and spring-sown small grain.

¹ The data reported in this paper were obtained largely from reports submitted to T.V.A. by 31 state agricultural experiment stations listed in tables 1 and 4. Most of the data were obtained by Alabama, Colorado, Georgia, Iowa, Kentucky, Mississippi, New York, North Carolina, Tennessee, Virginia, and Washington stations, with whom T.V.A. has contractual fertilizer research projects.

² Agronomist and former Assistant Chief, respectively, Soils and Fertilizer Research Branch, Division of Agricultural Relations, T.V.A.

Received for publication July 11, 1955.