Urea release from a scoop of coated beads in a given volume of a well stirred liquid has been investigated analytically and experimentally. A
method for determining the fractional cumulative release and fractional release rate curves for the scoop without knowing particle number and radii
is presented. The representative D/Kb for a scoop of urea beads spray coated with ethyl cellulose is near 3.5 108 cm2/s, and that with cellulose
acetate phthalate is near 7 108 cm2/s.