Particulate multicomponent soil additive

Details Particulate multicomponent soil additive Particulate multicomponent soil additive

1975-02-24

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

040266958

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.

REFERENCES:
patent: 2074880 (1937-03-01), 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

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