Crop Response to Metaphosphate Fertilizers
1956
Terman, G. L. | Seatz, L. F.
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.
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