We are no longer updating the Research Digest. All content remains.
The Permaculture Research Digest has summaries of newly published permaculture-related research. All items are hyper-linked to the original publication.
The 'January 2013' archive contains 60 items published in 2012.
Items marked with a # have restricted public access, although abstracts are freely available.
Urban agriculture may solve issues of feeding urban populations. It has been estimated that the total rooftop space in China is about 1
million hectares, some of which can be converted for rooftop farming. This article present here a feasibility study of hydroponically grown vegetables
in a rooftop screen house in Guangzhou, China. None
of the roof hydroponic vegetables exceeded the maximum residue limit
for lead, arsenic, cadmium, chromium, mercury, or nitrate. In contrast, 5
of 98 market vegetables were contaminated by exceeding the maximum
residue limit for lead. Similarly 3 were contaminated for arsenic, 23
for nitrate, and 2 for organophosphate or carbamate insecticide.
Compared to high-end vegetables sold on the market, rooftop-grown
vegetables were competitive in cost and quality. Given that many
countries have limited arable land to feed a large population, the
widespread adoption of rooftop hydroponics could help expand the total
area available for food production.
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