Particulate urea-formaldehyde fertilizer composition and process

Details Particulate urea-formaldehyde fertilizer composition and process Particulate urea-formaldehyde fertilizer composition and process

1975-12-04

1977-05-24

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

For mushrooms

71 28, 71 29, 71 30, 71 64DC, 71 64F, 71DIG1, C05G 302, C05C 902

Patent

active

040253295

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.

REFERENCES:
patent: 2755509 (1956-07-01), Smidth
patent: 3705794 (1972-12-01), Czurak et al.
patent: 3794478 (1974-02-01), Dirksen

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