We studied the effects of amendment with zeolitized tuffs (ZT) in recovering nitrogen and phosphorus as potential plant nutrients in soils treated with wastewater (WW). The surface horizon of two contrasting soils (a sandy, alkaline Entisol, and a sandy-loam, sub-acidic Alfisol), was pedotechnically managed with different ratios of Neapolitan Yellow Tuff (NYT) and a clinoptilolite bearing tuff (ZCL). It was then exposed