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Kimberly Moore, Scott Greenhut, and Wagner Vendrame

to 128 m 3 ·GJ −1 electricity. Little research has been conducted on the feasibility, methods, and costs of greenhouse and field production of jatropha in the United States. Jatropha is easy to propagate, hardy, and grows relatively fast ( Openshaw

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Alexander Miller, Petrus Langenhoven, and Krishna Nemali

in winter than in other seasons due to decreased field acreage and production. However, maintaining an optimal environment for lettuce in a greenhouse can be challenging with prevailing light and temperature conditions during winter in the northern

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Sophia Kamenidou, Todd J. Cavins, and Stephen Marek

supplementation of hydroponically cultured gerbera resulted in a higher percentage of flowers grading as Class I and significantly thicker flower stems ( Savvas et al., 2002 ). Silicon is a predominant element in mineral soils. However, in greenhouse

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Jennifer H. Dennis, Roberto G. Lopez, Bridget K. Behe, Charles R. Hall, Chengyan Yue, and Benjamin L. Campbell

The $147.8 billion U.S. green industry includes nursery and greenhouse producers, landscape service providers as well as wholesale and retail distributors ( Hall et al., 2006 ). The wholesale value of plant production by nurseries in the top 17 U

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Gene A. Giacomelli and William J. Roberts

The diversity of coverings for the greenhouse and other plant production structures has increased dramatically during the past 4 decades. This has resulted from the availability of new types of covering materials and enhancements of previously existing materials, as well as the demands for technological improvements within the expanding controlled environment agricultural industry. The types of coverings currently available are dominated by plastics. These range from traditional glass to the recent advent of polymer plastics, such as thin films or multilayer rigid thermoset plastic panels. Available enhancements such as ultraviolet radiation (UV) degradation inhibitors, infrared radiation (IR) absorbency, and anti-condensation drip surfaces, as well as their physical and spectral properties are discussed. The selection of specific covering alternatives has implications for the greenhouse superstructure and its enclosed crop production system.

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Judy Lee and William B. Miller

potted Ornithogalum , more information on preplant environmental conditions and greenhouse protocols is needed. Determination of proper temperature sequences for the entirety of bulb production and utilization is an important aspect of flower bulb

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Lyn A. Gettys and Kimberly A. Moore

required for these projects, but many wetland nurseries lack the facilities and infrastructure to produce large numbers of plants. This problem could be addressed by developing methods to grow these wetland species using greenhouse and nursery techniques

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Kimberly A. Williams and Paul V. Nelson

188 ORAL SESSION (Abstr. 747-753) FLORICULTURE: GREENHOUSE MANAGEMENT/NUTRITION

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Serge Gagnon, Mohamed Mzouri, and André Gosselin

82 POSTER SESSION 12 Greenhouse Management/Cross-Commodity

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Andrew Koeser, Gary Kling, Candice Miller, and Daniel Warnock

generated more interest than “behind the scenes” practices such as organic fertilizer or efficient greenhouse space usage ( Yue et al., 2011 ). Similar results were found in the work by Hall et al. (2010) , who found that container type outweighed all other