Long-term sustainability of agricultural systems requires that soils stay productive and that necessary inputs remain available in the future – Soil loss occurs more rapidly than soil creation in many agricultural landscapes, and the soil that remains declines in quality – One-way fertilizer nutrient flows simultaneously cause pollution and scarcity – E.g., Phosphorus: essential plant nutrient; expected to become increasingly expensive to mine and process; at the same time, P runoff causes eutrophication of water bodies.
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