{"product_id":"9780415384841","title":"Short-cutting the Phosphorus Cycle in Urban Ecosystems","description":"This dissertation presents a methodology of short-cutting the phosphorus cycle in urban ecosystems. In nature, the P-cycle is a circular, closed-loop system, but human activities use and dispose P in a linear, open-ended system leading to the customary environmental problems. Lake Chivero in Zimbabwe is used as a case study to illustrate the unsustainable practice of discharging valuable and finite phosphorous into drinking water resources. Short-cutting or closing the P-cycle in the urban environment is closely related to the closure of water cycles. Closing the P-cycle is dependent on the adoption of ecological sanitation and eco-city concepts. These concepts lead to solutions, which are source orientated (local and small scale), non-mixing, ecologically sound, closed-loop systems. Recycling of P in urban ecological agriculture (without synthetic fertilisers) is used in this dissertation to test the feasibility of these concepts. A phosphorus calculator has been developed, based on studies of monthly P-fluxes and stocks, in a high-density suburb of Harare in Zimbabwe, where agriculture is an established activity. ","brand":"Bekithemba Gumbo","offers":[{"title":"Default Title","offer_id":45772343050558,"sku":"9780415384841","price":5653.62,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4357\/7662\/products\/9780415384841_f0d0a3a9-204a-4fe0-8f8c-208866106574.jpg?v=1707252437","url":"https:\/\/exclusivebooks.co.za\/products\/9780415384841","provider":"Exclusive Books Online","version":"1.0","type":"link"}