This research report summarizes more than two years' research on the design, construction and testing
of an experimental composting greenhouse developed by the Biothermal Energy Center and the New
Alchemy Institute in early 1983. A joint research project at the Institute's 12-acre research and
education farm on Cape Cod, Massachusetts combines modem composting and horticultural practices
in the same structure. Compost is enclosed in an insulated chamber within the greenhouse. Heat and
carbon dioxide liberated by bacteria during composting are used to enhance the production of
greenhouse crops and eliminate fuel costs normally associated with running greenhouses, and offset
costs of running this moderately-sized composting operation. The 576-square-foot test composting
greenhouse produced more than 100 tons of compost and tens of thousands of seedlings in its first full
year of operation. Research is continuing to improve the materials handling system, study the nitrogen
dynamics and adapt the prototype to practical applications on several different scales.
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