Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1976-10-18
1977-05-31
Spear, Jr., Frank A.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 29, 71 53, 71 64F, 423396, C05C 900
Patent
active
040266966
ABSTRACT:
This invention relates to a particulate multicomponent soil additive, a method of applying that additive to soils to improve the agronomic quality of the same, and methods of producing such multicomponent soil additives. The compositions comprise particle-form combinations of calcium sulfate and a nitrifier selected from urea, ammonium nitrate, and combinations of these, in which the nitrifier particles are coated with a layer of the reaction product of hydrated calcium sulfate and urea, ammonium nitrate, or both. This layer, in turn, contains an additional soil additive such as elemental sulfur or the major and minor plant nutrients such as phosphorus, potassium, magnesium, copper, zinc and the like. The particles are produced by reacting the particle-form nitrifier, preferably urea or ammonium nitrate prills, with hydrated calcium sulfate intimately mixed with one or more additional soil additives. Reaction is promoted by heating to a temperature sufficient to initiate the endothermic reaction without melting or thermally decomposing the nitrifier. Superior aging stability during storage or use is realized by reacting and heating the system until the total water level, including both chemical and physical water, is reduced to 1.5 weight percent or less.
REFERENCES:
patent: 2074880 (1932-03-01), Whittaker et al.
patent: 3149956 (1964-09-01), Seymour et al.
patent: 3580715 (1971-05-01), Dilday
patent: 3617239 (1971-11-01), Klanica
patent: 3867124 (1975-02-01), Church
Hartman Richard C.
Laird Michael H.
Lander Ferris H.
Sanford Dean
Spear, Jr. Frank A.
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