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    2. Differences in Inflorescence Numbers and Endogenous Gibberellic Acid Levels in ‘Afterglow’ Bougainvillea

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    Collection:
    Agricultural Communications Documentation Center (ACDC)
    Contributers:
    Chng, Mun Wye (author) and Moore, Kimberly A. (author)
    Format:
    Journal article
    Language:
    International
    Publication Date:
    2020-12-01
    Published:
    USA: American Society for Horticultural Science
    Location:
    Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 202 Document Number: D12048
    Journal Title:
    Hort Technology
    Journal Title Details:
    Vol. 30, issue 6
    Notes:
    4 pages, via Online journal, Bougainvillea (Bougainvillea sp.) plant inflorescence number will vary in response to multiple cues such as changes in temperature, water, light intensity, pruning, and photoperiod. Previous research reports that the application of plant growth regulators (PGRs) to bougainvillea grown under varying photoperiods improved inflorescence number, probably as a result of changes in gibberellic acid (GA) levels. There are many bioactive plant GAs, but we chose to investigate differences in gibberellic acid 3 (GA3) levels and inflorescence number in response to the application of ethephon (2-cholorethylphosponic acid) or abscisic acid (ABA) to ‘Afterglow’ bougainvillea (Bougainvillea ×buttiana) grown under 14-hour photoperiod [long-day (LD)] conditions. Plants were 5 inches tall with seven visible lateral nodes and were grown in a greenhouse in 4-inch pots filled with 5-mm coarse aquarium zeolite. Ethephon was applied as a foliar spray at 0.05, 0.07, 0.10, 0.15, or 0.20 mg/plant. ABA was applied as a soil drench at 1, 1.5, 3, 6, 8, or 10 mg/plant. Endogenous levels of GA3 were measured 1 and 48 days after treatment to calculate the change in GA3 (∆GA3). A short day (SD) control of 8 hours was included to measure differences in inflorescence number and ∆GA3 between photoperiods. ‘Afterglow’ plants grown under SD conditions had the greatest decrease in ∆GA3 (–1.09 µg·g–1) over 48 days and the most inflorescences (10.6) compared with LD control plants with a decrease in ∆GA3 of –0.09 µg·g–1 and fewer inflorescences (1.0). Plants grown under LD conditions and treated with 0.05 mg/plant ethephon had inflorescence numbers (9.6) and levels of ∆GA3 (–0.74 µg·g–1) similar to the SD control. As ethephon rate increased to more than 0.05 mg/plant, inflorescence number on LD plants decreased and ∆GA3 increased. Exogenous ABA rates of 1 mg/plant produced inflorescence numbers (1.4) and ∆GA3 (–0.10 µg·g–1) similar to the LD control. As the rate increased, ∆GA3 increased and inflorescence number decreased. Plants treated with ABA rates of 3 mg/plant and more were defoliated and had no inflorescences.

    3. Environmental threat appeals in green advertising

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    Collection:
    Agricultural Communications Documentation Center (ACDC)
    Contributers:
    Hartmann, Patrick (author), Apaolaza, Vanessa (author), D'Souza, Clare (author), Barrutia, Jose M. (author), and Echebarria, Carmen (author)
    Format:
    Journal article
    Publication Date:
    2014
    Published:
    International
    Location:
    Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 154 Document Number: D07027
    Journal Title:
    International Journal of Advertising
    Journal Title Details:
    33(4) : 741-765

    9. Using an experiential learning design to teach photography in agricultural communications

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    Collection:
    Agricultural Communications Documentation Center (ACDC)
    Contributers:
    Kennedy, Lindsay (author), Akers, Cindy (author), Jackson, Rachel B. (author), and Texas Tech University
    Format:
    Journal article
    Publication Date:
    2017
    Published:
    United States: New Prairie Press
    Location:
    Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 2 Document Number: D10172
    Journal Title:
    Journal of Applied Communications
    Journal Title Details:
    101(4)
    Notes:
    13 pages, via online journal, Photography is an important competency of agricultural communications graduates and is a core skill taught in the discipline’s curriculum. The [department] at [university] offers an undergraduate photography course twice yearly in two semester formats: a traditional spring semester where photography principles are taught in the classroom and a 12-day experiential intersession semester that allows for flexibility in how and where the course is taught. Both semesters utilize the same instructor, assignments, and grading rubric. While much agricultural communications research has focused on photography as a needed skill, few studies examine photography teaching methods. The purpose of this study was to compare student performance in an agricultural communications digital photography course taught with an experiential learning approach to a traditional classroom approach during the 2016 and 2017 academic calendar years. Kolb’s (1984) experiential learning theory was used as the theoretical framework for this study. Independent-samples t-tests were conducted to compare students’ cumulative mean assignment scores, individual assignment mean scores, and rubric criteria mean scores within the two instruction formats. The results suggest instruction method has an effect on student performance in agricultural communications digital photography courses. Students in the experiential intersession course had significantly higher mean cumulative assignment scores compared to students in the traditional course. While individual assignment performance was less affected by instruction format, students’ understanding of specific photography skills (rubric criteria), especially composition and clarity was higher when in the experiential intersession format.

    10. Voluntary-threat approaches to reduce ambient water pollution

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    Collection:
    Agricultural Communications Documentation Center (ACDC)
    Contributers:
    Suter, Jordan F. (author), Segerson, Kathleen (author), Vossler, Christian A. (author), and Poe, Gregory L. (author)
    Format:
    Journal article
    Publication Date:
    2010-07
    Published:
    USA
    Location:
    Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 157 Document Number: D07517
    Journal Title:
    American Journal of Agricultural Economics
    Journal Title Details:
    92 (4): 1195-1213