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    • Journal of Range Management, Volume 51 (1998)
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    Defoliation and cold-hardiness of northern wheatgrass

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    Author
    Kowalenko, B. L.
    Romo, J. T.
    Issue Date
    1998-01-01
    Keywords
    winter hardiness
    mowing
    Elymus lanceolatus
    harvest date
    ambient temperature
    Saskatchewan
    mortality
    duration
    weight
    tillers
    biomass production
    defoliation
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    Citation
    Kowalenko, B. L., & Romo, J. T. (1998). Defoliation and cold-hardiness of northern wheatgrass. Journal of Range Management, 51(1), 63-68.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644075
    DOI
    10.2307/4003565
    Additional Links
    https://rangelands.org/
    Abstract
    Freezing temperatures in winter were hypothesized to be a major cause of mortality of tillers following defoliation of northern wheatgrass (Agropyron dasystachyum [Hook.] Scribn., syn. Elymus lanceolatus [Scribn. & Smith] Gould). Cold-hardiness of northern wheatgrass tillers was determined following a single mowing to a 5-cm stubble height in late May, June, July, or August in 1992 or 1993 in southwestern Saskatchewan. An unmowed control was also included. Cold-hardiness was determined in early and late winter immediately following mowing by: 1) exposing tillers to controlled temperatures ranging from -3 to -36 degrees C, or; 2) exposing them to -15 degrees C for 0 to 15 days. The LT50 (temperature at which 50% of tillers died) of northern wheatgrass tillers in early winter ranged from -29.5 to < -36.0 degrees C in 1992-93, and averaged -24.0 degrees C in 1993-94. In late winter LT50 ranged from -18.1 to -22.6 degrees C in 1992-1993, and it averaged -22.0 degrees C in 1993-1994. The LDur50 (duration at which 50% of tillers died) of tillers exposed to -15 degrees C for 0 to 15 days ranged from 8.0 to 13.1 days in early winter, and 2.7 to 4.7 days in late winter. Unexpectedly mowed tillers were generally more cold-hardy than those from control. In early winter LT50 was 1.5 to 10 degrees C lower for mowed than control tillers. The hypothesis that defoliation reduces cold-hardiness of northern wheatgrass was rejected. The degree or duration of cold stress in the field is generally insufficient to reduce tiller survival in northern wheatgrass. Late winter through early spring is a critical period for tiller survival of northern wheatgrass because cold-hardiness declines this time of the year. Maintaining insulating cover can moderate soil temperatures and reduce damage to plants from freezing temperatures.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003565
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 1 (January 1998)

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