REMEDIATION TECHNIQUES FOR MANURE NUTRIENT LOADED SOILS

摘要

Many soils in the United States contain excessive levels of nutrients, especially phosphorus (P) due to repeatedheavy applications of animal manure. Also, soils with a history of long-term poultry litter or swine manure applications haveelevated levels of copper (Cu), zinc (Zn), selenium (Se), and arsenic (As). Runoff and eroded soils carry dissolved andsediment-associated nutrients to water bodies and degrade their quality. Several best management practices (BMPs) have thepotential to reduce nutrients in runoff water. Integrated solutions are needed for managing excess manure nutrients in cropand livestock production systems. A combination of load reduction techniques and structural and cultural practices may berequired to effectively balance the need to reduce soil nutrient levels and discharges from nutrient-loaded fields with thebenefits of sustainable production of food and fiber and the need to protect natural resources and the environment for futuregenerations. This paper summarizes technologies to reduce excessive nutrient levels in the soil, and to reduce edge of fielddischarges of nutrients via runoff or sediment loss from over-application of manure or other organic solids.