Manure, as a source of organic matter and plant nutrients, is an excellent conditioner for soils. As fertilizer in agronomic systems, manure can cycle nutrients between soils, plants and livestock. However, in areas where livestock become concentrated and limited land is available for application, excess nutrients can lead to water quality issues. If manure application is to be locally restricted, alternative uses must be found. These uses can be simple, such as transporting to nutrient poor regions, or require more complex infrastructure, such as energy production or nutrient extraction.