Attrition-resistant, controlled release fertilizers
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United States of America Patent
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Feb 14, 1989
Issued Date -
N/A
app pub date -
Aug 6, 1987
filing date -
Aug 18, 1986
priority date (Note) -
Expired
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Abstract
An attrition-resistant, controlled release fertilizer comprising a water-soluble central mass containing nucleophilic reactive functional groups surrounded and chemically bonded to a base coating formed by reacting a molecular excess of a coupling agent with the nucleophilic groups of the central particles, and a water-insoluble layer, surrounding and chemically bonded with the base coating, formed by the reaction and polymerization of the excess functional groups of the coupling agent used in forming the base coating is described. A preparation method is provided.
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