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Gene A. Giacomelli

High tunnels are a special type of greenhouse with primary operational goals of season extension, crop quality improvement, and new crop production opportunities to reach unique markets. From an engineering viewpoint, high tunnels have many of the same design concerns as larger, more complex greenhouses. They capitalize on the greenhouse effect as do all enclosed plant growth structures. However, less automated environmental control systems are required for the desired crop production. Tunnel designs are less complex and less expensive than large high-technology greenhouse ranges, but they must be designed and constructed with the fundamental assurance of structural stability, safety, efficient layout, appropriate environmental control, and effective crop management in mind.

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Edward E. Carey, Lewis Jett, William J. Lamont Jr, Terrance T. Nennich, Michael D. Orzolek, and Kimberly A. Williams

semipermanent, movable, or temporary, although they are usually considered temporary structures for purposes of property assessment and taxation ( Blomgren and Frisch, 2007 ). Typically, high tunnels are unheated and are passively ventilated, but they must have

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Tiffany L. Maughan, Kynda R. Curtis, Brent L. Black, and Daniel T. Drost

and look like greenhouses but are passively heated and cooled, which significantly reduce operating costs as compared with greenhouses. They are temporary structures constructed with either galvanized steel or polyvinyl chloride pipe framing and

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W. Garrett Owen, Alyssa Hilligoss, and Roberto G. Lopez

or multispan temporary structure made from pipe or other durable framework that is covered with a single or double layer of greenhouse grade 4- or 6-mm plastic and typically has no electrical service, automated ventilation, or heating system ( Lamont

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Michael A. Ortiz, Krystyna Hyrczyk, and Roberto G. Lopez

temporary structure made from pipe or other durable framework that is covered in a single or double layer of greenhouse-grade 4- to 6-mil plastic and typically has no electrical or heating systems ( Carey et al., 2009 ; Montri and Biernbaum, 2009 ; Wells

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Charles R. Hall and Dewayne L. Ingram

was considered a temporary structure in terms of its GWP and variable costs for construction and would last 20 years. The metal frame would be constructed of galvanized steel pipe (418 kg) and would require 100 labor hours for construction. Stone (36

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Suzette P. Galinato and Carol A. Miles

can lengthen the growing season from 1 to 4 weeks in the spring, and 2 to 8 weeks in the autumn ( Wells and Loy, 1993 ). High tunnels are generally considered to be temporary structures covered with greenhouse-grade plastic, have no electrical system