Particulate urea-formaldehyde fertilizer composition and process
First Claim
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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0 Petitions
Accused Products
Abstract
A controlled-release particulate fertilizer composition is prepared by compacting and agglomerating particles of a foamed urea-formaldehyde condensation product into a sheet having a specific gravity of at least 1.40, the molar ratio of urea to formaldehyde in said condensation product being from 1.3:1 to 2.4:1, comminuting the compacted sheet into particulate form and separating and recovering the particles having a size of more than 30 mesh, substantially all said recovered particles having a ratio of largest to smallest particle of less than 3:1. The fertilizer is characterized by a high degree of uniformity from particle to particle in both composition and size, relatively high particle density and a combination of both quick initial and long lasting nutrient release.
42 Citations
9 Claims
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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 release of nutrient occurs quickly and extends for a period of at least six weeks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- 1 to 2.4;
Specification