Mineral fertilizers provide nutrients to crops and promote their growth, and at the same time they play an important role in regulating the pH and fertility of soil. However, the uncontrolled use of mineral fertilizers can cause side effects in plants. Therefore, in recent decades, the importance of producing and using fertilizers with slow or controlled release has become widely recognized as an efficient way of the nutrient management in plants The use of such a fertilizer represents improved agrotechnical measures, better yield, improved appearance and quality of the crop , as well as savings in labor. Assimilation of phosphorus in plants is quite low, which presents a serious problem for crop growth, since phosphorus plays the most important role in the root system. This problem can be solved by use of slow or controlled release fertilizers which can be prepared by coating the granules with various polymeric materials that reduce their dissolution rate. Cellulose acetate (CA) has proven to be one of the most attractive polymeric materials for fertilizer coating due to its biodegradability, non-toxicity and low cost. In this work, commercial granular fertilizer NPK15-15-15 (Petrokemija Plc.) is coated with different mixtures of polymer in a rotary drum. The thickness of the polymer layer was analyzed by scanning electron microscopy (SEM), while the phosphorus release profile was analyzed by UV-Vis spectroscopy. It has been found that by increasing the number of coating cycle, the thickness of the polymer film increases. The thickest layer of polymer film, which was around 200 μm after 20 cycles of deposition, was obtained using the CA/PMMA 50/50 polymer mixture. Also, by increasing the thickness of the polymer film, the release of phosphorus from the coated fertilizer granules was prolonged, and the slowest release was notified in the CA /PLA 50/50 system, where 36.9 % phosphorus was released during 120 minutes, while the uncoated granules displayed 98.4 % phosphorus release during the same time.