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  • Author or Editor: D.L. Hensley x
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Elaeagnus umbellata (Thunb.) plants were planted in acid soil amended with CaCO3 equivalents of 0.0, 6.6, 13.2, 19.7, 26.4, 52.7, and 102.0 MT/ha of Ca(OH)2 and grown in the greenhouse for 21 months. The pH of the amended soil declined with time. Acetylene reduction rates increased with increasing Ca(OH)2 additions up to 26.4 MT/ha CaCO3 equivalent. The lowest dry matter accumulation in root, stem, leaf and nodule tissue occurred at the lowest pH (3.2) with surviving plants. Dry matter accumulations of leaves, roots and nodules were not statistically different at higher pH values.

Open Access

Over $1 billion per year is spent nationally for pruning trees to restrict growth. Plant growth regulators offer a means to extend pruning cycles, reducing future pruning costs. In this study, the influence of flurprimidol (flur) on wound closure rate was investigated. Acer saccharinum, Celtis occidentalis, Fraxinus pennsylvanica, Gleditsia triacanthos, and Populus deltoides were injected using an Arborchem pressure injection system, followed by trunk wounding. Injections of flurprimidol (at both 1X and 3X rates) and wounding were conducted in spring, early summer, and late summer. Without flur, wound closure rate was slowest in maple and most rapid in cottonwood. Flur suppressed wound closure rate most greatly in hackberry, and had the least influence on cottonwood. In addition, wound closure rates in the presence of flur were influenced by the timing of the treatments. These results will be of particular use to utility companies that prune trees under power lines.

Free access

Two systems of relay-intercropping muskmelons (Cucumis melo L.) with Scotch pine (Pinus sylvestris L.) Christmas trees using black plastic mulch and drip irrigation were evaluated for their potential to improve cash return. Returns ranged from a high of $26,200/ha for plastic mulch-drip irrigation and a selling price of $l.00/melon to a low of $6900/ha for bare ground-drip irrigation and a selling price of $0.40/melon. The benefit-cost index ranged from 24 to 3.4, depending on the system evaluated. Pine growth apparently was impeded by plastic mulch; however, increased yields of melons grown under plastic mulch may offset the slight decrease in pine growth.

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A hypermedia information system was developed to recommend trees for landscaping and to obtain information on these individual trees. Using the software HyperCard on the Macintosh computer, we developed a system that uses the idea of index cards with information being stored on separate screens called “cards.” Using a mouse, the user navigates from one card to another by click on a “button” on the card. The user may select from several criteria including tree type, tree height, soil type, drought tolerance, wind tolerance, shade tolerance, salt tolerance, and growth rate. The program then finds which trees meet the desired criteria and provides information on these trees. This easy-to-use system requires no typing except to enter a word to search for. The user can quickly browse for the desired information and save it as a text file or print it. The Farmer's Bookshelf provides a tool for extension agents, growers, and homeowners to easily obtain vitally needed information. The program has further application for landscape companies, Master Gardener programs, and in horticultural courses.

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