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    • Rangeland Ecology & Management, Volume 62, Number 1 (January 2009)
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    Cattle Grazing as a Biological Control for Broom Snakeweed: Vegetation Response

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    Author
    Ralphs, Michael H.
    Banks, Jeffery E.
    Issue Date
    2009-01-01
    Keywords
    biological control
    forage allowance
    grazing pressure
    prescribed grazing
    
    Metadata
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    Citation
    Ralphs, M. H., & Banks, J. E. (2009). Cattle grazing as a biological control for broom snakeweed: vegetation response. Rangeland Ecology & Management, 62(1), 38-43.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643001
    DOI
    10.2111/08-047
    Additional Links
    https://rangelands.org/
    Abstract
    Broom snakeweed (Gutierrezia sarothrae [Pursh] Britton Rusby) increases and dominates rangelands following disturbances, such as overgrazing, fire, and drought. However, if cattle can be forced to graze broom snakeweed, they may be used as a biological tool to control it. Cattle grazed broom snakeweed in May and August 2004-2007. Narrow grazing lanes were fenced to restrict availability of herbaceous forage to force cattle to graze broom snakeweed. They used 50-85% of broom snakeweed biomass. Mature broom snakeweed plant density declined because of prolonged drought, but the decline was greater in grazed lanes. At the end of the study, density of mature plants in grazed lanes was 0.31 plants m-2, compared with 0.79 plants m-2 in ungrazed pastures. Spring precipitation in 2005 was 65% above average, and a new crop of seedlings established following the spring grazing trial. Seedling establishment was greater in the spring-grazed lanes in which the soil had been recently disturbed, compared with the ungrazed transects and summer-grazed lanes. The cattle were not able to use the large volume of new broom snakeweed plants in the spring-grazed pasture. They did reduce the number of seedlings and juvenile plants in the summer-grazed pasture. Intense grazing pressure and heavy use did not adversely affect crested wheatgrass (Agropyron cristatum [L.] Gaertn.) cover, and it was actually higher in the summer grazed lanes than the ungrazed control transects. In moderate stands of broom snakeweed, cattle can be forced to graze broom snakeweed and reduce its density without adversely affecting the associated crested wheatgrass stand. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-047
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 1 (January 2009)

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