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    • Journal of Range Management, Volume 46 (1993)
    • Journal of Range Management, Volume 46, Number 2 (March 1993)
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    The constituent differential method for determining live and dead herbage

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    Author
    Gillen, R. L.
    Tate, K. W.
    Issue Date
    1993-03-01
    Keywords
    assessment
    measurements
    sampling
    forage
    dry matter
    chemical constituents of plants
    
    Metadata
    Show full item record
    Citation
    Gillen, R. L., & Tate, K. W. (1993). The constituent differential method for determining live and dead herbage. Journal of Range Management, 46(2), 142-147.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644644
    DOI
    10.2307/4002271
    Additional Links
    https://rangelands.org/
    Abstract
    Determination of live and dead herbage fractions from mixed herbage samples requires hand separation or specialized laboratory procedures. The constituent differential method is designed to determine the relative proportion of live and dead components in a mixture based on the difference in dry matter concentration between the components. Our objective was to evaluate several characteristics of the constituent differential method under field conditions in tallgrass and mixed grass vegetation. Estimation of live standing crop by this method is most sensitive to the dry matter content of the total mixture and the dead component but becomes less sensitive as the difference between these variables increases. Time-of-day was not usually associated with dry matter content of the herbage components if sampling began after the herbage was thoroughly dry to the touch. Suggested sample sizes in large experimental units for estimating dry matter content are 40-50 samples for herbage mixtures, 10 samples for live herbage, and 5 samples for dead herbage. In 4 field trials the average value for percent live herbage determined by hand separation and the constituent differential method differed by 1.6 percentage units, which was nonsignificant P>0.10). The constituent differential method is a relatively rapid and accurate method for determining live and dead herbage fractions.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002271
    Scopus Count
    Collections
    Journal of Range Management, Volume 46, Number 2 (March 1993)

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