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The purpose of the project is to overcome some of these constraints. The greenhouse design must effectively raise the minimum daily temperature relative to the outside air and effectively protect the plants, [[compost]], and [[vermiculture]] bin from the elements.<ref>Bartok, John W (1936). Greenhouses for Homeowners and Gardeners, NRAES;137, Natural Resource Agriculture and Engineering Service, New York</ref><ref>McCullagh, James C (1978). The Solar Greenhouse Book, Rodale Press, Pennsylvania</ref><ref>Abraham, George and Kathy (1984). Organic Gardening Under Glass, Van Nostrand Reinhold, New York</ref> Ideally, construction will be complete before winter ends (before the end of March, according to typical Arcata, CA climatology) so that weather conditions will be at their worst and the degree of success will be easiest to measure. Temperature readings will be taken at least twice daily, once around sunrise at T-min, and another late in the afternoon, typically T-max. A series of warm, generally summer-only plants will be grown as early on as possible in order to gauge practical as well as qualitative success. | The purpose of the project is to overcome some of these constraints. The greenhouse design must effectively raise the minimum daily temperature relative to the outside air and effectively protect the plants, [[compost]], and [[vermiculture]] bin from the elements.<ref>Bartok, John W (1936). Greenhouses for Homeowners and Gardeners, NRAES;137, Natural Resource Agriculture and Engineering Service, New York</ref><ref>McCullagh, James C (1978). The Solar Greenhouse Book, Rodale Press, Pennsylvania</ref><ref>Abraham, George and Kathy (1984). Organic Gardening Under Glass, Van Nostrand Reinhold, New York</ref> Ideally, construction will be complete before winter ends (before the end of March, according to typical Arcata, CA climatology) so that weather conditions will be at their worst and the degree of success will be easiest to measure. Temperature readings will be taken at least twice daily, once around sunrise at T-min, and another late in the afternoon, typically T-max. A series of warm, generally summer-only plants will be grown as early on as possible in order to gauge practical as well as qualitative success. | ||
The broad-scale goal is to demonstrate an appropriate means of increasing | The broad-scale goal is to demonstrate an appropriate means of increasing food production during the winter on a small-scale, supporting both sustainable living as well as community agriculture. | ||
Combining a greenhouse with a [[composting]] unit has two added benefits: heat and "CO<sub>2</sub> enrichment". In commercial greenhouse operations, CO2 enrichment is used extensively to boost yields. CO2 concentrations are raised to 1000-1500 ppm, which can double yields as long as other variables (light, water, moisture, temperature) are not constraints.<ref>Madsen, Erik (1968). "Effect of CO2-Concentration on the Accumulation of Starch and Sugar in Tomato Leaves." Physiologia Plantarum, 21(1), 168-175.</ref> The most widely used carbon source is unfortunately a fossil fuel, natural gas. Composting inside the greenhouse creates the same effect, but in a more climate-friendly way. | Combining a greenhouse with a [[composting]] unit has two added benefits: heat and "CO<sub>2</sub> enrichment". In commercial greenhouse operations, CO2 enrichment is used extensively to boost yields. CO2 concentrations are raised to 1000-1500 ppm, which can double yields as long as other variables (light, water, moisture, temperature) are not constraints.<ref>Madsen, Erik (1968). "Effect of CO2-Concentration on the Accumulation of Starch and Sugar in Tomato Leaves." Physiologia Plantarum, 21(1), 168-175.</ref> The most widely used carbon source is unfortunately a fossil fuel, natural gas. Composting inside the greenhouse creates the same effect, but in a more climate-friendly way. |