Particulate urea-formaldehyde fertilizer composition and process

  • US 4,025,329 A
  • Filed: 12/04/1975
  • Issued: 05/24/1977
  • Est. Priority Date: 12/04/1975
  • Status: Expired due to Term
First Claim
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1. A controlled release particulate fertilizer composition,said composition comprising particles having a specific gravity greater than 1.40,each of said particles containing a urea-formaldehyde condensation product as a nitrogen nutrient source in which the molar ratio of urea to formaldehyde in the condensation product is from 1.3:

  • 1 to 2.4;

    1, and at least one additional solid plant nutrient or pesticide trapped with each of said urea-formaldehyde particles,said particles being substantially uniform from particle to particle in both composition and size, the ratio of the largest to smallest of substantially all said particles being less than 3;

    1, and substantially no particles having a size of smaller than 30 mesh,said composition characterized in that the initial releaseof nutrient occurs quickly and extends for a period of at least six weeks.

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