Governments in the US and worldwide face increasing pressures to reduce air and nutrient pollution . At the same time, farmers are seeking technologies that can open new revenue streams and hedge against pollution taxes . Communities and citizen organizations also recognize the threats to water systems by concentrated animal feeding operations (CAFOs) such as dairy farms and support action to protect these valuable and shared resources . Nutrient management is becoming an increasingly important issue due to the need to secure strategic phosphorus resources (which are essential for securing future food supplies).