Phosphorus Control in Soils with Legacy Phosphorus Using RhizoSorb® Technology

The persistent issue of legacy phosphorus in agricultural soils presents a dilemma for farmers between increasing crop yields and protecting the environment. This project aims to address the issue through an innovative application of RhizoSorb® technology. It comprises of a mixture of activated metal oxides to manage the adsorption of excess phosphorous and its subsequent slow release based on concentration gradients. This dual-functionality approach not only mitigates the environmental impact of phosphorus runoff into water bodies but also enhances crop productivity, aligning with EPA's goals of reducing nutrient losses while maintaining or increasing crop yields. This technology represents a breakthrough in phosphorus management, offering a novel solution that outperforms existing methods. Unlike traditional approaches, which often focus solely on phosphorus retention, it effectively "mines down" legacy phosphorus, making it available for plant while preventing excess leaching. This unique capability to both capture and release phosphorus sets it apart in the market. The technical feasibility of this solution has been demonstrated through extensive laboratory studies, including batch sorption isotherms and column studies, which show its high efficiency in adsorbing and desorbing phosphorus. Additionally, the technology has been tested in pot studies where its slow release of phosphorus for plant uptake and control of phosphorus in leachate have been demonstrated. Adapting this for legacy phosphorous soils would be the focus of this project. This innovative approach surpasses current phosphorus control technologies by offering higher adsorption efficiency, with a potential to reduce phosphorus leaching by more than 50% and providing a sustained release of bio-available phosphorus. These features ensure better environmental outcomes and improved agricultural productivity compared to existing solutions. Consequently, the commercial potential of this technology is strong, particularly in the agricultural sector, where it addresses the growing demand for sustainable nutrient management practices. It is poised to benefit a wide range of end-users, including farmers, agribusinesses, and environmental management agencies. According to The Fertilizer Institute, among the top 20 states for row crops, 33 million acres are deemed to be high in phosphorus, with levels :2:50 ppm. Additionally, its cost-effectiveness and scalability further enhance its appeal, making it a viable option for large-scale adoption. Finally, the implementation of this technology has the potential to significantly reduce phosphorus pollution in waterways, contributing to improved water quality and healthier ecosystems. By enabling the recovery and reuse of legacy phosphorus, this approach supports sustainable agricultural practices that align with environmental conservation goals.