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    • Journal of Range Management, Volume 44 (1991)
    • Journal of Range Management, Volume 44, Number 3 (May 1991)
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    Long-term tebuthiuron content of grasses and shrubs on semiarid rangelands

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    Author
    Johnsen, T. N.
    Morton, H. L.
    Issue Date
    1991-05-01
    Keywords
    long term experiments
    herbicide residues
    metabolites
    Bouteloua eriopoda
    Bouteloua curtipendula
    tebuthiuron
    Poaceae
    Bouteloua gracilis
    shrubs
    semiarid zones
    application rates
    rangelands
    Arizona
    forage
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    Citation
    Johnsen, T. N., & Morton, H. L. (1991). Long-term tebuthiuron content of grasses and shrubs on semiarid rangelands. Journal of Range Management, 44(3), 249-253.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644743
    DOI
    10.2307/4002952
    Additional Links
    https://rangelands.org/
    Abstract
    Perennial plants collected from 5 north-central Arizona semiarid locations were assayed for tebuthiuron [N-5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl-N,N'-dimethylurea] and its metabolites using gas chromatography with flame photometric detection. Tebuthiuron was applied at rates ranging from 0.9 to 6.7 kg active ingredient (a.i.)/ha in 1975 through 1979. Plants were harvested in 1980 through 1986, 2 to 11 years after applications. Tebuthiuron was detected in sideoats [Bouteloua curtipendula (Michx.) Torr.] and blue grama [B. gracilis (H.B.K.) Lag. ex Griffiths] 10 years after application of 6.7 kg/ha. Metabolites of tebuthiuron were detected in blue grama 11 years after applications of 2.2, 4.5, and 6.7 kg/ha. The ratios of tebuthiuron to metabolites varied widely. The highest concentrations of tebuthiuron plus metabolites were 25 microgram/g in blue grama 10 years after application of 4.5 kg/ha, and 21 and 23 microgram/g in sideoats grama 9 and 10 years, respectively, after application of 6.7 kg/ha. Only these 3 samples of 120 samples assayed exceeded the legal limit of 20 microgram/g of tebuthiuron plus metabolites in forage plants. No samples from plots treated with 4.0 or less kg/ha exceeded 10 microgram/g of tebuthiuron plus metabolites, and only 10% of them exceeded 5 microgram/g.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002952
    Scopus Count
    Collections
    Journal of Range Management, Volume 44, Number 3 (May 1991)

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