PARTICULATE UREA-FORMALDEHYDE FERTILIZER COMPOSITION AND PROCESS

摘要

ABSTRACT OF THE DISCLOSUREA controlled-release particulate fertilizer compositionis prepared by compacting and agglomerating particles of afoamed urea-formaldehyde condensation product into a sheethaving a specific gravity of at least 1.40, the molar ratioof urea to formaldehyde in said condensation product beingfrom 1.3:1 to 2.4:1, comminuting the compacted sheet intoparticulate form and separating and recovering the particleshaving a size of more than 30 mesh, substantially all saidrecovered particles having a ratio of largest to smallestparticle of less than 3:1. The fertilizer is characterizedby a high degree of uniformity from particle to particle inboth composition and size, relatively high particle densityand a combination of both quick initial and long lastingnutrient release.