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Attrition resistant controlled release fertilizers

Attrition resistant controlled release fertilizers

United States Patent (US 4,711,659): 8

An attrition resistant, controlled release, fertilizer particle has a water soluble central mass of plant food compound containing <more or => 10% NH2 functional groups. A base coating surrounds and is chemically bonded to the central mass. The base coating consists of substituted ureas and is formed by reacting a molecular excess of liquid polyfunctional isocyanate with the NH2 functional groups of the central mass.

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Accession: 001533767

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