Phosphorus cycling in cities and in urban agriculture (Montreal)

Why do we care about nutrient cycling? Phosphorus
http://esmontreal.ca/index.php/component/k2/item/101-why-do-we-care-about-nutrient-cycling-phosphorus

Phosphorus and Urban Agriculture – VIDEO!
http://esmontreal.ca/index.php/component/k2/item/118-phosphorus-and-urban-agriculture-video

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Urban phosphorus sustainability: Systemically incorporating social, ecological, and technological factors into phosphorus flow analysis →