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Crop Response to Calcium Metaphosphate on Alkaline Soils 1
Author(s) -
Tisdale Samuel L.,
Winters Eric
Publication year - 1953
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1953.00021962004500060002x
Subject(s) - agricultural experiment station , metaphosphate , crop , state (computer science) , agriculture , citation , political science , agricultural economics , library science , operations research , history , agricultural science , geography , archaeology , environmental science , economics , law , mathematics , computer science , forestry , chemistry , phosphate , organic chemistry , algorithm
C A L C I U M metaphosphate fertilizer is produced by the reaction of hot P,O, gas with pulverized rock phosphate. This material, which contains 60 to 64% P,O,, is the highest-analysis phosphate fertilizer currently available in quantity. The economic advantages of such a highly concentrated material are immediately apparent. Considerable reductions may be possible in the costs connected with handling, storing, and transporting of calcium metaphosphate, 1 ton of which is equivalent to over 3 tons of 20:% superphosphate. Calcium metaphosphate has been recognized as a fertilizer material for several years. It has been subjected to laborai:ory, greenhouse, and field tests on soils that are acid, neutral, and alkaline. Generally, crop responses to this material on acid and neutral soils have been comparable to those obtained from the use of ordinary superphosphate or from concentrated superphosphate where sulfur is not limiting (10). Crop responses to calcium metaphosphate on alkaline soils, however, have not been consistent. It is the purpose of this paper to review briefly some a f the published information relative to the effectiveness of calcium metaphosphate, ordinary superphosphate, and Concentrated superphosphate on alkaline soils and to present data from some recently conducted experiments.