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    • Journal of Range Management, Volume 50 (1997)
    • Journal of Range Management, Volume 50, Number 3 (May 1997)
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    Response of spotted knapweed and grass to picloram and fertilizer combinations

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    Author
    Sheley, R. L.
    Jacobs, J. S.
    Issue Date
    1997-05-01
    Keywords
    plant density
    picloram
    integrated control
    Centaurea maculosa
    application rates
    fertilizer
    Montana
    
    Metadata
    Show full item record
    Citation
    Sheley, R. L., & Jacobs, J. S. (1997). Response of spotted knapweed and grass to picloram and fertilizer combinations. Journal of Range Management, 50(3), 263-267.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644159
    DOI
    10.2307/4003727
    Additional Links
    https://rangelands.org/
    Abstract
    Spotted knapweed (Centaurea maculosa Lam.) has reduced forage production, increased soil erosion, and lowered biodiversity on millions of hectares of rangeland throughout the western United States. Objectives of this study were to quantify the interaction between picloram (4-amino-3,5,6-trichloropicolinic acid) and fertilizer on spotted knapweed density and grass yield. Four picloram rates (0.0, 0.14, 0.28, and 0.42 kg ha-1) and 4 fertilizer rates (N+P: 0.0+0.0, 10.5+12.2, 21.1+26.4, and 31.7+39.6 kg ha-1) were applied to 3 spotted knapweed infested rangeland sites in a factorial combination arranged in a randomized-complete-block design during the spring of 1994. Grass yield and spotted knapweed density were measured at peak standing grass crop in 1994 and 1995. Data were analyzed as a split-plot in time using analysis of variance. Picloram and fertilizer did not interact to affect either spotted knapweed density or grass yield. All picloram treatments reduced spotted knapweed density to nearly zero. By 1995, all picloram treatments increased grass yield by an average of 1,500 kg ha-1. Fertilization did not affect spotted knapweed density, but the highest rates increased grass yield on those sites with a substantial residual grass understory. Combining fertilizer with picloram may enhance grass yield on sites with a residual of highly productive grasses.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003727
    Scopus Count
    Collections
    Journal of Range Management, Volume 50, Number 3 (May 1997)

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