Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1975-12-17
1977-06-07
Spear, Jr., Frank A.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 29, 71 53, 71 64F, 423396, C05C 900
Patent
active
040280888
ABSTRACT:
This invention relates to methods of producing 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 and a binder supplement comprising powdered urea and/or ammonium nitrate having particle sizes below 30 mesh. Reaction is promoted by heating to a temperature sufficient to initiate the endothermic reaction without melting or thermally decomposing the nitrifier.
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Backlund P. Stanley
Young Donald C.
Hartman Richard C.
Laird Michael H.
Lander Ferris H.
Sandford Dean
Spear, Jr. Frank A.
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