Method of preparing a non-caking slow release fertilizer

Claim 1

METHOD OF RENDERING DISCRETE SOLID FERTILIZER PARTICLES NON-CAKING, SAID FERTILIZER PARTICLES COMPRISING A DISPERSION OF A SOLID FERTILIZER IN A SOLID WAX PHASE, SAID FERTILIZER PARTICLES CONTAINING 50-75% SOLID FERTILIZER AND 25-50* SOLID WAX PHASE, THE PERCENTAGES BEING BY WEIGHT OF SAID FERTILIZER PARTICLES, SAID SOLID WAX PHASE CONTAINING AT LEAST 50% WAX BY WEIGHT OF SAID WAX PHASE, WHICH COMPRISES TUMBLING A MIXTURE OF SAID FERTILIZER PARTICLES AND AN INERT FINELY DIVIDED SOLID, SOFTENING THE WAX PHASE OF SAID FERTILIZER PARTICLES BY CONDUCTING SAID TUMBLING AT AN ELEVATED TEMPERATURE BELOW THE MELTING POINT OF SAID WAX PHASE, WHEREBY PARTICLES OF SAID INERT SOLID ARE EMBEDDED IN THE WAX PHASE AT THE SURFACE OF SAID FERTILIZER PARTICLES, CONTINUING SAID TUMBLING UNTIL ESSENTIALLY THE ENTIRE SURFACE OF SAID FERTILIZER PARTICLES IS COVERED BY PARTICLES OF SAID INERT SOLID EMBEDDED IN THE WAX PHASE THEREOF, WHEREBY NON-CAKING FERTILIZER PARTICLES ARE OBTAINED, SAID PARTICLES CONTAINING A CORE OF SOLID FERTILIZER DISPERSED IN A SOLID WAX PHASE, SAID CORE BEING OVERLAID WITH A THIN CONTINUOUS ADHERENT FILM OF SAID INERT FINELY DIVIDED SOLID.