Recently synthesized, sustainable Zinc (Zn) fertilizers, derived using dairy wastewater and solid zinc containing waste (Zn-WWT), have been tested and their agricultural performance assessed utilizing field experimentation for wheat and maize growth. The data obtained have demonstrated that Zn-WWT achieved a Zn concentration increase in the green biomass at levels comparable to those delivered by conventional, water soluble Zn fertilizers, such as ZnSO4, low solubility ZnO and chelated Zn-EDTA. An increase in dry wheat mass yield obtained using Zn-WWT was statistically significant when compared with the control samples. Different from conventional Zn fertilizer sources, Zn-WWT contains significant amounts of nitrogen, phosphorus, calcium and organic carbon, all derived from environmentally benign and sustainable sources, which benefit wheat and maize growth. The presence of these elements suggests a new way for improving waste utilization via nutrient recovery and supply to zinc deficient plants. While agrochemical performance varied among the plants tested as a function of zinc delivery sources, their solubility in water and application methods, only Zn-WWT represented a fully sustainable fertilizer that can be derived from solid and liquid waste to mimic chelation with the resulting slow release properties.