Green Roofs - Living Architecture Monitor - Fall 2010 - (Page 26)

RESEARCH INCREASING URBAN FOOD SECURITY WITH EXTENSIVE GREEN ROOFS GROUNDBREAKING RESEARCH SHOWS THE POTENTIAL TO GROW FOOD ON ROOFS USING A NUTRIENT TEA DERIVED FROM HOUSEHOLD ORGANIC WASTE By Stephanie Gaglione & Brad Bass, Ph.D. T o increase food security in urban areas, food and environmental advocates are recommending that cities embrace urban agriculture. As most of the expected future global population growth will occur in urban areas, green roofs, which do not require additional fertile land, offer a very promising approach to increasing local food security and reducing the energy and cost of transporting this food into a city. However, many buildings can only accommodate very lightweight, extensive green roofs that are too thin to maintain a nutrient supply in the growing medium. Nutrients can be replenished using a commercial fertilizer, which in itself will have a large carbon input and an additional expense. Some recent work with lightweight, extensive green roof panels demonstrated that food could be grown on these roofs using a nutrient tea derived from household organic waste. This experiment used an ultra-light green roof panel with less than three centimeters of growing medium in one square-metre panels, manufactured by XeroFlor International. These panels were five-years old and had exhausted their nutrients. The aerobic degradation of household organic waste was exploited to create a high-quality nutrient tea from compost that was evaluated as a replacement for conventional fertilizers. A liquid nutrient source was derived from compost produced from six-to-eight centimetre layers of carbon- and nitrogen-rich organic waste combined with 20 millilitres of an acclimated bacterial liquid to speed up decomposition. Heirloom seeds of Red Russian kale, Bloomsdale spinach, Salad Bowl lettuce, Bronze Arrowhead lettuce as well as http://www.dinoflex.com http://www.dinoflex.com

Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Fall 2010

Green Roofs - Living Architecture Monitor - Fall 2010
From the Founder - Urban Agriculture
Strata - T.O.’s New Green Roof Construction Standard
On the Roof With…Richard Conlin
Project - Farming for the City
Beekeeping - Diary of an Urban Apiarist
Exemplary Design - GRHC’s 2010 Awards of Excellence Winners
A Green Roof That Moves
Steeped in Ecological Design
Creating Community
A Model of Municipal Leadership
A Green Roof That Works
Like a Grassland Stream
Prairie in the City
Recycling Rainwater
Research - Increasing Urban Food Security With Extensive Green Roofs
Economic Valuation of a Rooftop Food Garden
Grhc Update - Macro-Scale Food Production
New Corporate Members
New GRPs
On Spec - Urban Agriculture — Hero or Hype?

Green Roofs - Living Architecture Monitor - Fall 2010

http://www.nxtbook.com/dawson/greenroofs/lam_2019Fall
http://www.nxtbook.com/dawson/greenroofs/lam_2019Summer
http://www.nxtbook.com/dawson/greenroofs/lam_2019Spring
http://www.nxtbook.com/dawson/greenroofs/lam_2018winter
http://www.nxtbook.com/dawson/greenroofs/lam_2018Fall
http://www.nxtbook.com/dawson/greenroofs/lam_2018summer
http://www.nxtbook.com/dawson/greenroofs/lam_2018spring
http://www.nxtbook.com/dawson/greenroofs/lam_2017winter
http://www.nxtbook.com/dawson/greenroofs/lam_2017fall
http://www.nxtbook.com/dawson/greenroofs/lam_2017summer
http://www.nxtbook.com/dawson/greenroofs/lam_2017Spring
http://www.nxtbook.com/dawson/greenroofs/lam_2016winter
http://www.nxtbook.com/dawson/greenroofs/lam_2016fall
http://www.nxtbook.com/dawson/greenroofs/lam_2016summer
http://www.nxtbook.com/dawson/greenroofs/lam_2016spring
http://www.nxtbook.com/dawson/greenroofs/lam_2015Winter
http://www.nxtbook.com/dawson/greenroofs/lam_2015fall
http://www.nxtbook.com/dawson/greenroofs/lam_2015summer
http://www.nxtbook.com/dawson/greenroofs/lam_2015spring
http://www.nxtbook.com/dawson/greenroofs/lam_2014winter
http://www.nxtbook.com/dawson/greenroofs/lam_2014fall
http://www.nxtbook.com/dawson/greenroofs/lam_2014summer
http://www.nxtbook.com/dawson/greenroofs/lam_2014spring
http://www.nxtbook.com/dawson/greenroofs/lam_2013winter
http://www.nxtbook.com/dawson/greenroofs/lam_2013fall
http://www.nxtbook.com/dawson/greenroofs/lam_2013summer
http://www.nxtbook.com/dawson/greenroofs/lam_2013spring
http://www.nxtbook.com/dawson/greenroofs/lam_2012fall
http://www.nxtbook.com/dawson/greenroofs/lam_2012summer
http://www.nxtbook.com/dawson/greenroofs/lam_2012spring
http://www.nxtbook.com/dawson/greenroofs/lam_2012winter
http://www.nxtbook.com/dawson/greenroofs/lam_2011fall
http://www.nxtbook.com/dawson/greenroofs/lam_2011summer
http://www.nxtbook.com/dawson/greenroofs/lam_2011spring
http://www.nxtbook.com/dawson/greenroofs/lam_2011winter
http://www.nxtbook.com/dawson/greenroofs/lam_2010fall
http://www.nxtbook.com/dawson/greenroofs/lam_2010summer
http://www.nxtbook.com/dawson/greenroofs/lam_2010spring
http://www.nxtbook.com/dawson/greenroofs/lam_2010winter
http://www.nxtbook.com/dawson/greenroofs/lam_2009fall
http://www.nxtbook.com/dawson/greenroofs/lam_2009summer
http://www.nxtbook.com/dawson/greenroofs/lam_2009spring
http://www.nxtbook.com/dawson/greenroofs/lam_2009winter
http://www.nxtbook.com/dawson/greenroofs/lam_2008fall
http://www.nxtbookMEDIA.com