Establishment of Range Grasses on Various Seedbeds at Creosotebush [Larrea tridentata] Sites in Arizona, U.S.A., and Chihuahua, Mexico

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Abstract
Perennial grasses were seeded by drilling or broadcasting on 4 mechanical and 3 herbicidal weed control and/or seedbed preparation treatments at 4 semidesert grassland sites invaded by creosotebush (Larrea tridentata) in the Chihuahuan and Sonoran Deserts. The cultivars ''Cochise'' Atherstone lovegrass (Eragrostis lehmanniana .times. Eragrostis trichophora) and ''Catalina'' Boer lovegrass (Eragrostis curvula var. conferta) lovegrasses were initially established and persisted in 6 of the 8 plantings on disk plowed and disk plowed plus contour furrowed seedbeds. These grasses were established and persisted in 2 of the 5 plantings made in creosotebush stands treated with tebuthiuron [N-(5-(1,1-dimethylethyl)-1,3,4-thiadizol-2-yl)-N-N''-dimethylurea] at 0.5, 1.0, and 1.5 kg a.1/ha rates. Grasses established initially on two-way railed and land imprinted areas usually died within 3 or 4 years.