Fertilizer compositions and method of making such compositions
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Jun 29, 1989
filing date -
Jun 29, 1989
priority date (Note) -
Expired
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Abstract
An improved fertilizer composition is disclosed, including particles of a sparingly soluble fertilizer source having porous outer surfaces (for example, IBDU.RTM.) which have been coated with a hard outer coating that substantially covers the surface of each of the particles and substantially fills the pores in the surface of each of the particles. The particles are thereby hardened by the coating and are given increased resistance to abrasion and dust formation. The hardened outer coating is preferably formed when a liquid binder (which preferably includes a mixture of urea and a lignosulfonate) is sprayed onto the particles and then allowed to harden or cure. A process for making such hardened fertilizer particles is also disclosed.
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