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L.R. Adam and M.K. Pritchard

An inexpensive system for monitoring and controlling relative humidity (RH) above 90% and for monitoring temperature was developed and tested in a storage research facility for horticultural crops. A general-purpose IBM-PC microcomputer connected to an analog/digital interface system allowed for 16 differential analog inputs and 12 digital outputs for monitoring temperature and RH in eight storage rooms. Relative humidity, measured at 2-min intervals by an inexpensive wet/dry bulb psychrometer in each room, was regulated by a cool-mist humidification system. The standard deviation of RH from set-point was ± 2.8% at 2C and ±3.1% at 10C dry bulb temperature. The software. written in BASIC, allows for additional upgrading to meet future requirements. Commercially available components were used to construct the system at a cost of about Cd$1400 (Canadian) (microcomputer and cool-mist humidification system excluded).

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Charlotte R. Chan and Robert D. Marquard

The Holden Arboretum, established in 1931, is the largest arboretum in the United States. Its mission is to promote the knowledge and appreciation of plants for personal enjoyment, inspiration, and recreation; for scientific research; and for educational and aesthetic purposes. Of the Arboretum's 3100 acres, 800 acres support collections and display gardens, while the balance comprise natural areas. The collections include nearly 8,000 accessions from 76 plant families; about 700 plant species, some rare or endangered, occupy the natural areas. The education component of the mission connects the Arboretum with the public through school programs, classes, horticultural therapy, and seasonal internships. Two research fellowships are also available. The Holden Arboretum has expanded the research emphasis. The David G. Leach Research Station, part of the Arboretum since 1986, focuses on rhododendron and magnolia breeding and research. Built in 1993, the Horticulture Science Center is a modern research and production facility able to more fully implement and support a broad range of formal horticultural research. The main objective of the research program is to develop superior woody ornamentals for the landscape through hybridization. Additional research emphasizes reproductive biology and using biochemical markers (isozymes and RAPDs) to answer basic questions about the genera under study (Aesculus, Hamamelis, Cercis).

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K. Francis Salifu, Michael A. Nicodemus, Douglass F. Jacobs, and Anthony S. Davis

. Goodman, and M. Selig assisted with the greenhouse work. Rob Eddy and his staff assisted with maintenance of plants at the Purdue University Horticulture and Landscape Architecture Plant Growth Facility. We thank the anonymous reviewers for their

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George E. Fitzpatrick, Edwin R. Duke, and Kimberly A. Klock

82 COLLOQUIUM 3 Municipal Waste Compost Production and Uses for Horticultural Crops

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D.J. Tennessen and V.A. Lalli

The population of senior citizens in our society (65 and older) are growing at a faster rate than any other segment of the population. Loss of decisionmaking capabilities coupled with controlled retirement home environments can lead to stress and depression in our elderly. At the same time, our nations youth no longer enjoy a family nucleus that includes elders who help guide youth away from risky activities. The publication “HILT: Horticulture Intergenerational Learning as Therapy” (Cornell Media Services, Ithaca, N.Y., in press) was used as a guidebook for combining senior citizens and gradeschoolers at three local settings in 1995 and 1996. The project encourages elders to take charge and mentor youth while leading youth in an indoor and outdoor gardening program. The pilot projects included a public gradeschool site, a mental day-care facility, and a local retirement home. Youth benefited by learning about their elders and about horticulture. The subject of horticulture provides a comfortable and valuable learning environment as well as a focal point for the participants. The project provides three evaluation methods that include survey, interview, and leader observation tools. In our study, senior participation increased by 75% during two 8-week projects and 40% during a 7-month project. Surveys reveal that senior citizens were nervous and concerned about behavior of young people before the project, yet renewed and excited about future projects after participation. Youth enjoyed hearing stories, learning about planting, and getting dirty. Use of self concept and morale scales will be presented. A copy of the project publication as well as ideas about using the publication will be provided in the discussion.

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Marietta Loehrlein and Richard Craig

1 Current address: Assistant professor of horticulture, Department of Agriculture, Western Illinois University, Macomb, IL 61455. 2 J. Franklin Styer professor of horticultural botany, Department of Horticulture, Pennsylvania State University

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Catherine A. Paul, Greg L. Davis, Garald L. Horst, and Steven N. Rodie

Water conservation in a landscape is an important issue because periodic water shortages are common in many regions of the world. This increases the importance of specifying landscape plants that require less water and matching the plant to site microclimates. Our objectives were to establish water-use rates for three herbaceous landscape plants and to determine the level of water reduction these plants can tolerate while maintaining both visual and landscape quality. Water use rates were determined for Schizachyrium scoparium (Little bluestem), Hosta spp. (Hosta) and Festuca cinerea `Dwarf' (Dwarf blue fescue) in studies using pot lysimeters at the Univ. of Nebraska Horticulture Research Greenhouse facility. Each lysimeter was watered to saturation, allowed to drain to field capacity, and weighed. The lysimeters were weighed again 24 h later, and the process was repeated to determine daily evapotranspiration. Results indicated that hosta used less water than dwarf blue fescue and little bluestem. In a subsequent study to compare the relative effects of withholding irrigation among these species, seven groups of five replicates of each species were grown in 1 peat: 0.33 vermiculite: 0.66 soil: 1 sand (by volume) in 7.6-L containers. Each container was watered to saturation, allowed to drain for 24 h to reach field capacity, and allowed to dry down in 10-day increments. Results of the dry-down study indicated that little bluestem maintained the best visual quality for the longest duration of drought, followed by dwarf blue fescue and hosta in decreasing order of visual quality.

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Kirk W. Pomper and Michael A. Grusak

1 To whom reprint requests should be addressed. Current address: Principal investigator of horticulture and curator of the USDA National Clonal Germplasm Repository for Asimina spp., Atwood Research Facility, Kentucky State Univ., Frankfort, KY

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Desmond R. Layne and J.A. Flore

1 Former graduate research assistant. Currently principal investigator of Horticulture, 129 Atwood Research Facility, Kentucky State Univ., Frankfort, KY 40601, and adjunct assistant professor, Dept. of Horticulture and Landscape Architechture, Univ

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Justin Butcher, Teddy Morelock, and Danielle Williams

Postharvest storage of southernpeas, Vigna unguiculata (L.) Walp., is a crucial point of the production process. Governed by consumer demands, farmers strive for a product that is high in quality and freshness, and has an appropriate texture and appealing color. Improper storage of southernpeas will result in their eventual deterioration, unacceptance, and possible loss of profit. Because of this, an appropriate storage facility and temperature should be devised that will benefit both farmer and consumer. In an effort to prevent potential losses of southernpeas, a study was conducted to determine the best environmental condition at which to store them to potentially extend their shelf-life. In 2004, five southernpea varieties—`Early Acre,' `Early Scarlet,' `Excel Select,' `Coronet,' and `Arkansas Blackeye #1'—were planted in a randomized block design on the University of Arkansas horticulture farm. Upon maturity, 12 green pods of each variety were subjected to a sweated and unsweated treatment and then shelled. After shelling, the seeds were subjected to four different environmental conditions evaluating each on the basis of changes in physical appearance. Further objectives of the study were to determine the best variety, environmental condition, and treatment to maintain product quality in a manner that would relate to growers on a commercial basis. Results showed that a refrigerated environment at or near 3 to 5 °C is a good environment to store this particular crop for nearly 2 weeks. It also appeared that the sweated treatment assisted with the shelling process and maintained the appearance of each variety longer. From the results, temperature and percent relative humidity are arguably two important components of postharvest storage that have the potential of negatively affecting the crop.