Phosphorus circulation (tP/year), Saclay plateau

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Phosphorus inputs relate to synthetic fertilizer for arable lands, animal feed and human food imports, as well as green waste (Fig. 4). Phosphorus outputs include agricultural production (arable land, grasslands, and forestry), local population wastes managed at a region scale, urine and feces, organic products for fertilization (manure and compost), and finally leaching and erosion. The four highest phosphorus flows in the agri-food system (75% of total flows) are human food imports, urine and feces exports, synthetic fertilizers for arable land imports and arable land production exports. Regarding phosphorus flows, these figures confirm the clear uncoupling between agriculture and local food consumption on the Saclay plateau.