a controlled release fertilizer including a fertilizer granule , having an outer surface , a coating of biopolymer composition on the outer surface of the fertilizer granule , wherein the biopolymer composition includes at least one biopolymer , and a process of making the controlled release fertilizer including the steps of screening fertilizer granules to a preselected granule size , heating a biopolymer to become substantially fluid , and applying the biopolymer onto the surface of the fertilizer granule to produce a coating on the granule of a predetermined amount .