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The nesting of row covers and low tunnels inside high tunnels is also common. [1] Superbay Polytunnel at Van Arnham Nurseries. Polytunnels can be used to provide a higher temperature and/or humidity than that which is available in the environment but can also protect crops from intense heat, bright sunlight, winds, hailstones, and cold waves.
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In compost-heated greenhouses, heat and carbon dioxide are generated from a manure-based compost contained in a special chamber attached to one side of the greenhouse. [24] The New Alchemy Institute designed and built an experimental composting greenhouse in 1983 to research opportunities for the production of biothermal energy. [25]
The book describes strategies for achieving net zero greenhouse gas emissions by 2050, and emphasizes that many efforts to reduce emissions are actually counter-productive. For example, one can reduce CO 2 emissions in 2030 by replacing a coal-fired electrical power plant with a new natural gas power plant (since coal combustion emits twice as ...
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Propagation typically occurs as a step in the overall cycle of plant growth. For seeds, it happens after ripening and dispersal ; for vegetative parts, it happens after detachment or pruning; for asexually-reproducing plants, such as strawberry, it happens as the new plant develops from existing parts.
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