Interesting that the abstract for the New York rooftop garden paper suggests NOT composting used mulch or unmarketable portions of vegetables to return to the soil, as this could increase heavy metal build up. It would be interesting to know if other studies have concluded the same as, if so, this would be an important tip to get out urban gardens (many of which are probably composting onsite extensively).
Interesting that the abstract for the New York rooftop garden paper suggests NOT composting used mulch or unmarketable portions of vegetables to return to the soil, as this could increase heavy metal build up. It would be interesting to know if other studies have concluded the same as, if so, this would be an important tip to get out urban gardens (many of which are probably composting onsite extensively).