Center for Complementary and Alternative Medicine. CEAC Paper D-412380-01-06, Supported by CEAC, The Controlled Environment Agriculture Center, College of Agriculture and Life Sciences, The University of Arizona. Special thanks to Bruce Walsh at the
Maedza K. Vuwani, Mpumelelo Nkomo, Wonder Ngezimana, Nokwanda P. Makunga, and Fhatuwani N. Mudau
differences between the control and all other treatments. Foliar application of the studied micronutrients did have an influence on the metabolite quantities as has been reported with most secondary metabolite fluctuations caused by plant-environment
The commercial greenhouse operation, with a controlled and structured environment and a large number of highly repetitive tasks, offers many advantages for automation relative to other segments of agriculture. Benefits and incentives to automate are significant and include improving the safety of the work force and the environment, along with ensuring sufficient productivity to compete in today's global market. The use of equipment and computers to assist production also may be particularly important in areas where labor costs and/or availability are a concern. However, automation for greenhouse systems faces very significant challenges in overcoming nonuniformity, cultural practice, and economic problems. As a case study, a robotic workcell for processing geranium cuttings for propagation has been developed. The robot grasps randomly positioned cuttings from a conveyor, performs leaf removal, trims the stems, and inserts the cuttings into plug trays. While the system has been shown to process effectively many plants automatically, the robot is not equipped to handle successfully the wide variety of cuttings that a trained worker handles with aplomb. A key challenge in greenhouse automation will be to develop productive systems that can perform in a reliable and cost-effective way with highly variable biological products.
Jeffrey A. Anderson
and use of the Controlled Environment Research Laboratory are gratefully acknowledged.
Lisa G. Neven
As concerns about the safety of our food supply increase along with concerns about the impact of agricultural chemicals on our environment, the development of nonchemical quarantine treatments to meet export requirements become increasingly necessary. The types of physical treatments used have been largely determined by commodity tolerances and processing practices. The most common physical treatments use temperature extremes such as heat [>40 °C (104.0 °F)] and cold [<10 °C (50.0 °F)]. Other physical treatments commonly include the use of controlled or modified atmospheres (low oxygen, elevated carbon dioxide). Current technology has led to investigations in the application of energy to control infesting insects. These treatments include ionizing radiation, microwaves, ultraviolet radiation, infrared radiation, radio frequency, electron beam, X-rays, and electricity. Although the effects of these physical treatments can impact commodity quality, the goal of the treatments is to kill infesting (real or in certain instances, potential) insects to meet quarantine requirements. The effects of physical treatments on insect mortality and fecundity are discussed.
Gioia D. Massa, Jeffery C. Emmerich, Robert C. Morrow, C. Michael Bourget, and Cary A. Mitchell
Oral Session 7—Controlled Environments 28 July 2006, 8:00–9:00 a.m. Southdown Moderator: Chieri Kubota
Peter R. Hicklenton, Suzie M. Newman, and Lindsay J. Davies
, New Zealand, for supporting this research and members of the Technical Services Group, National Climate Laboratory, HortResearch, for maintaining the controlled-environment rooms during this study. The cost of publishing this paper was defrayed in part
Keith A. Funnell, Errol W. Hewett, Ian J. Warrington, and Julie A. Plummer
Trust for providing funding for this project, and to the staff at the National Climate Laboratory for maintaining the controlled environment facilities used in this study. The cost of publishing this paper was defrayed in part by the payment of page
David R. Dreesen and Robert W. Langhans
Abbreviations: CEGR, controlled environment growth rooms; HI, high irradiante levels; LI, low irradiance levels; MHI, medium high irradiance levels; MLI, medium low irradiance levels 1 Former graduate research assistant, currently research associate
Carol Dawson and J.M. Zajicek
The Green Brigade, organized by the Bexar County Agricultural Extension Service in San Antonio, Texas, is a community-based horticultural program for juvenile offenders based on the earn while learning philosophy. This study determined if participation in the Green Brigade Program improved self-esteem, locus of control, interpersonal relationships, and attitudes toward school, toward gardening and toward the environment as well as decreased recidivism of juvenile offenders. To measure psychological variables, a pre-test, post-test design was implemented using the Self-Report of Personality from The Behavior Assessment System for Children (BASC). A questionnaire, developed by the researchers, measured environmental attitudes as well as basic horticultural knowledge. Youths participating in the Green Brigade were pre-tested on the first day of the session and post-tested on the final day of the 6-month session. Comparisons were made between children based on age, ethnic background, gender, and session of the Green Brigade in which they participated. Results determined the relationship between participation in the Green Brigade and the dependent variables mentioned previously.