الفهرس 
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Abstract
Fertilization using common fertilizers, especially urea, can cause several serious problems. One of the most severe problems connected to fertilization is as follows, nutrient loss to the environment through leaching, evaporation, or excessive unnecessary application of these fertilizers. this problem can cause several further complications as it will increase environmental pollution, distort the ecosystem, and it will affect human health in one way or another. Besides reducing the efficiency of crop nitrification. As a solution for these complications, slow release fertilizers have been developed to overcome the adverse effects of common fertilizers.