Providing mineral nutrients of plants is from the main requirements associated with the production of crops. However, indiscriminate use of fertilizers has increased concerns about the adverse effects on the environment and the physical and chemical properties of soils. One of the effective methods to overcome the problems of indiscriminate use of chemical fertilizers is the development of controlled-release fertilizers. Biological polymers are most suitable among natural compounds for synthesis of the slow release systems of nutrients. In this study, alginate and rosin bio-polymers individually or combined with zeolite clay with the zeolite:polymer ratios of 1:2, 1:4, 1:8 were used to produce slow-release systems of nitrate and potassium. The amount of nitrate and potassium ions released from the slow release systems to the aqueous solutions were measured after 1, 3, 5, 10, 15, 20, 25 and 30 days. The effects of zeolite:rosin based systems on corn uptake and leaching of potassium and nitrate ions were also investigated using sand cultures. Results showed that the rosin:zeolite systems were the most effective compounds in gradual release of potassium and nitrate ions. The sand beds treated with KNO 3 showed the greatest amounts of nitrate and potassium ions leached with the highest concentration peaks occurred at the first leaching event. The greatest cumulative amounts of ions leached were observed for the cultures treated with KNO 3 and 1:4 zeolite:rosin system, and the lowest amount was measured for those containing the 1:8 system. The shoot yields were similar for the plants treated with the slow-release systems and KNO 3 , However, the greatest root yield was obtained in pots treated with KNO 3 . Maximum itrogen uptake by the roots was related to plants treated with the pure rosin system. Application of the other systems caused similar plant nitrogen uptake. While the greatest potassium uptake by the corn root was related to pots treated with the pure rosin and the 1:8 systems. The highest nitrogen uptake by the shoots was observed by the plants under two treatment of pure rosin and 1:8 systems and the highest K uptake by the shoots was related to the 1:8 system. Overall, slow release systems based on rosin:zeolite are the most suitable candidates to slowly release nitrate and potassium for the plants.