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    • Journal of Range Management, Volume 48 (1995)
    • Journal of Range Management, Volume 48, Number 2 (March 1995)
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    Predicting flowering of 130 plants at 8 locations with temperature and daylength

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    Author
    White, L. M.
    Issue Date
    1995-03-01
    Keywords
    latitude
    Midwestern United States
    great plains states of usa
    flowering date
    heat sums
    photoperiod
    prediction
    ambient temperature
    plants
    phenology
    
    Metadata
    Show full item record
    Citation
    White, L. M. (1995). Predicting flowering of 130 plants at 8 locations with temperature and daylength. Journal of Range Management, 48(2), 108-114.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644447
    DOI
    10.2307/4002795
    Additional Links
    https://rangelands.org/
    Abstract
    An improved plant phenological method is needed to accurately predict flowering of a large array of plant species at locations with a wide range of latitude. Degree days or degree days times daylength cannot be used to accurately predict flowering of both early and late flowering species when grown at locations with wide range of latitude. Published flowering dates of 130 plant species from among 8 locations in central North America ranging in latitude from 39 to 50 degrees N and longitude 84 to 108 degrees W were used to develop a degree days times daylength factor to predict flowering dates. Plants flowering in late June flowered at the same time at all 8 locations regardless of latitude. Species flowering earlier than late June flowered earlier at southern locations than those at Treesbank, Manitoba. Species flowering after late June flowered later at southern locations than those at Treesbank. Flowering of 124 species divided among 8 locations was most accurately predicted by the accumulation of degree days (threshold = 2 degrees C) times daylength factor (1/(0.259-0.0140*daylength) from the first of December. This method slightly discounts daylength below 13 hours and greatly increased its weight for every hour over 13 hours. This method predicted flowering dates with a standard deviation of 0.1, 0.5, -1.7, 2.4, -0.1, 6.0, -1.8, and -1.1 days for Swift Current, Saskatchewan; Treesbank, Manitoba; Sidney, Mont.; Fargo, N.D.; Sauk and Dane Co., Wisc.; Wauseon, Ohio; and Manhattan, Kans.; respectively. Degree days or degree days times daylength had a standard deviation of 10 and 18 days in predicting flowering dates at Manhattan, Kans.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002795
    Scopus Count
    Collections
    Journal of Range Management, Volume 48, Number 2 (March 1995)

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