In this study the structure, morphology and fertilizer capacity of potassium doped natural zeolite is investigated. The surface characterization of potassium doped natural zeolites has been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM)/ EDX analysis. The potassium doped zeolitic materials were tested for potential application as fertilizer in growing of wheat (Triticum aestivum L) and oat (Avena Sativa).