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    Previous grazing or clipping affects seed of Indian ricegrass

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    Author
    Orodho, A. B.
    Cuany, R. L.
    Trlica, M. J.
    Issue Date
    1998-01-01
    Keywords
    recalcitrant seeds
    genetic change
    strain differences
    Achnatherum hymenoides
    scarification
    viability
    frequency
    seed weight
    seed productivity
    cultivars
    seed germination
    seed dormancy
    defoliation
    grazing
    New Mexico
    Colorado
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    Citation
    Orodho, A. B., Cuany, R. L., & Trlica, M. J. (1998). Previous grazing or clipping affects seed of Indian ricegrass. Journal of Range Management, 51(1), 37-41.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644149
    DOI
    10.2307/4003561
    Additional Links
    https://rangelands.org/
    Abstract
    Previous heavy grazing for more than 50 years, compared with protection from livestock grazing, in the semi-arid area of Chaco Canyon in the southwestern United States did not result in any significant decrease in seed production potential of Indian ricegrass [Oryzopsis hymenoides (Roem. and Schult.) Ricker]. There also were no significant differences in seed production between grazed and ungrazed collections of Indian ricegrass from the Chaco Canyon study site when transplanted and grown in a common garden. This indicated that long-term protection from livestock grazing probably had not genetically (ecotypically) altered seed production potential. Both grazed and ungrazed transplants of Indian ricegrass differed in seed production from the cultivars 'Paloma' and 'Nezpar'. Nezpar produced the greatest seed yield (312 kg/ha), while Paloma had the lowest yield (78 kg/ha). Defoliation about 1 June over a 2-year period reduced seed production and nitrogen fertilization did not increase seed yield. Previous grazing history had little effect on seed germination, but there were significant differences in germination among some collections and cultivars of Indian ricegrass. Germination was less than 5% for all entries. A tetrazolium viability test showed that seed of native strains were more viable than those of Paloma. Dormancy is a troublesome, but desirable, trait of Indian ricegrass seed for use in droughty areas.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003561
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 1 (January 1998)

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