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Kathleen Evensen and David Beattie


The balloon flower, Platycodon grandiflorum cv. Mariesii, is an attractive, long-lived, hardy herbaceous perennial with thick, fleshy, carrot-like roots and dark blue campanulate flowers (Fig. 1). Plant height is about 60 cm for ‘Mariesii’, 45 cm in ‘Apoyama’, and 60-90 cm for the other cultivars (1). Flower colors are blue (‘Mariesii’), white, and light pink, and flower buds mature acropetally. Before the flower opens, the petals remain fused, giving the swollen bud a ballon-like appearance. Flowers are borne erect, solitary, and terminal, but the close arrangement on the stem gives the appearance of a loose raceme. Although Platycodon usually is grown as a garden perennial, recent interest in perennial cut flowers as well as the upright growth habit, attractive buds and flowers, and long period of time that the plants remain in flower suggest that, if forced in the greenhouse, they could be used as cut flowers. This paper describes the longevity, response to preservatives, and tolerance of typical handling procedures of cut Platycodon.

Free access

David J. Beattie and Lawrence C. Ragan

An interactive spreadsheet program was developed to demonstrate how a landscape bid is estimated. Information from a profit and loss statement, entered periodically, is retained for succeeding bids. Machine and labor costs are determined separately. For an individual bid, inputs include cost of materials, overhead, labor and machine times, contingency, and profit. Labor costs are automatically modified to reflect crew efficiency, and materials costs reflect storage, freight, and other charges. Overhead is based on the relationship between annual direct and indirect costs. The calculations section displays intermediate steps of the final bid estimate. Summaries from calculations include a final bid estimate. A printing option allows the user to selectively print any of the sections, a customer's copy, or the entire bid. The program uses an Apple Macintosh computer, was written for Microsoft Excel software, and uses macro programs. Its concept can be adapted to any electronic spreadsheet and can be protected to allow entry of only certain input data. The program can be used for small landscape businesses, classroom instruction, and/or extension instruction in which higher-order thinking skills are emphasized.

Free access

Fahed A. Al-mana and David J. Beattie

A study of applying growth retardants under overhead and subsurface irrigation systems was conducted on bermudagrass (Cynodon dactylon L. cv. Tifway) grown from rhizomes in 15-cm pots containing sand medium. Paclobutrazol (50%) at 2 mg/pot was used as foliar spray or charged-hydrophilic polymers (Super Sorb C) and either incorporated or put below medium surface. Mefluidide (28%) at 0.01% ml/pot was used only as foliar spray. Before spray treatments, grasses were cut at 2 cm from medium surface, and the second cut was made at the 6th week from treatment. All growth retardant treatments reduced grass height compared to non-treated plants. The lowest grass height was produced by paclobutrazol as foliar spray under overhead irrigation in the 6th and 9th week. By the 9th week, all hormonal treatments under the two irrigation systems had no effect on grass quality, color, and establishment rate. Both paclobutrazol foliar spray and below medium surface charged-polymer treatments under subsurface irrigation had the lowest water loss and dry weight by the 6th and 9th week. The paclobutrazol charged-polymer treatment under subsurface irrigation had also the the lowest root dry weight among all treatments. Although mefluidide foliar spray was less effective on grass height than paclobutrazol, they had similar effect on water loss and shoot dry weight.

Free access

John White, David Beattie, and Yvonne Clark

Information storage technologies are changing, so this project is focused on the future and the use of new videodisc technology. A model plant science inquiry-learning tool was developed for vocational agriculture students using advanced video and computer technology. The interactive videodisc lesson, which focuses on plant identification, was designed to increase learning and allow teachers to spend more time with students.

Free access

Troy M. Buechel, David J. Beattie, and E. Jay Holcomb

A characteristic problem with peat moss is its difficulty in initial wetting and rewetting, especially in a subirrigation system. Wetting agents improve wetting characteristics primarily by reducing the surface tension of water. This results in a rapid, uniform movement of water by capillary rise through the growing medium.

Two methods were used to compare the effectiveness of different wetting agents: gravimetric and electrical. Ten cm pots containing peat moss were placed in a subirrigation system. The gravimetric method used a laboratory scale where pots were periodically weighed to determine the amount of water absorbed. The electrical method utilized thin beam load cells, which have strain gages bound to the surface, to determine the weight of a suspended object. Load cells were coupled with a Campbell Scientific datalogger to collect data every minute without removing the pot from subirrigation. Because the effect of buoyancy altered the true weights, equations were generated to adjust the water uptake values. Corrected weights were used to create absorption curves for comparison of the slopes to determine which wetting agent has the fastest rate of absorption. The load cell reliably and accurately described the wetting characteristics of Peat moss and we found good agreement with the gravimetric method.

Free access

Mark A. Rose, David J. Beattie, and John W. White

Two distinct patterns of whole-plant transpiration (WPT) were observed in `Moonlight' rose (Rosa hybrida L.) using an automated system that integrated a greenhouse climate computer, a heat-balance sap-flow gauge, an electronic lysimeter, and an infrared leaf temperature sensor. One pattern consisted of a steady rate of transpiration in a stable greenhouse environment. The second pattern consisted of large oscillations in transpiration unrelated to any monitored microclimate rhythms. These oscillations had a sine-wave pattern with periods of 50 to 90 minutes and ranged from 2 to 69 g·h-1 in natural light and 3 to 40 g·h-1 under high-pressure sodium lamps at night. Leaf-air temperature difference (T1 - Ta) also oscillated and was inversely related to transpiration rate. Oscillatory transpiration has not been reported in roses. Plant scientists need to recognize the complex and dynamic nature of plant responses such as the oscillatory pattern of WPT monitored in Rosa hybrida when selecting monitoring and control strategies.

Free access

Xuri Zhang, David J. Beattie, and John W. White

Commercially cooled bulbs of five genetically dwarf Asiatic hybrid lilies were stored frozen at -2 C. Every 4 weeks for a total of 40 weeks, they were potted and forced in controlled environment chambers at 10, 15, 20, or 25 C. For each temperature, days from the time of potting to shoot emergence, visible bud appearance, and anthesis generally decreased as storage time increased. The number of flowers per plant and plant height were not significantly affected by storage time. Compared with those at 15, 20, or 25 C, plants at 10 C required significantly more time from potting to shoot emergence, visible bud, and anthesis. However, the temperature effects on forcing time were not linear. There was a 30-50 day decrease from potting to anthesis when temperature was increased from 10 to 15 C, but there was only a decrease of about 10 days when temperature was increased from 15 to 20 C. In contrast, there was no significant difference in forcing time between plants at 20 and 25 C. This indicates there is no need to force these lilies above 20 C. Plants at 25 C had more aborted flower buds than those at 10, 15, or 20 C. Plants at 10 C were taller then those at 15, 20, or 25 C.

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E. Jay Holcomb, Silvia Gamez, David Beattie, and George C. Elliott

Ebb-and-flow irrigation reduced water and fertilizer use by ≈ 40% when compared to overhead hand-watering by hose in the production of Hedera helix. In contrast, water and fertilizer use were not significantly different between ebb-and-flow and drip irrigation systems in the production of Asiatic hybrid lilies. Adequate growth of Hedera helix `Baltica' was obtained with 50 mg N/liter of 20-10-20 (20N-4.4-16.6K) or 20-19-18 (20N-8.4P-14.9K). Also, good market-quality hybrid lilies were produced with 75 mg N/liter of 20-19-18 (20N-8.4P-14.9K), 16-4-12 (16N-1.8P-10K), 20-0-20 (20N-0P-16.6K), and 20-10-20 (20N-4.4P-16.6K).

Full access

Hala F. Nassar, David J. Beattie, and Dan T. Stearns

An undergraduate major in Landscape Contracting was established at The Pennsylvania State University in 1989. Since its inception, women have been consistently underrepresented (13%). From department records and a survey instrument, we examined the academic performance, postgraduate job perceptions, and gender related issues of 319 male and female graduates. Our results showed that women students academically outperformed their male peers in courses specific to the Landscape Contracting curriculum. Survey results indicated that female graduates were represented in all job categories and performed similar types of work as their male peers. In addition, women did not differ significantly from their male peers in regard to job performance and satisfaction levels.