Four Wyoming big sagebrush (Artem& tri&nW ssp. wyomingends Beetle and Young) control treatments: burning, spraag with 2,4-D, rotocutting, and plowing, along with no control (rest) were compared in southwestern Montana. Production date (excluding sagebrush) were collected 10 years and sagebrush canopy cover and understory basal cover were collected 8 years during the period 1963-1981. Sagebrush canopy was most effectively reduced by burning while plowing with seeding was least effective. Rest alone resulted in a 29% reduction In sagebrush canopy during the study period. By 1981, burning provided the most production from the dominant forage species (bluebunch wheatgrass (Agropyron @catum (Pursh) Scribn.) and important vegetal classes, although buming and spraying were equally successful when production was totaled for all years sampled. Understory basal cover did not prove useful to evaluate treatment effectiveness.

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Highlight: Burning of sagebrush produces water repellency in soils. Maximum repellency occurs at soil temperatures between 1400 and 1800°F. The field test indicated that repellency is produced as a result of the burning of the sagebrush leaf mulch under the shrub rather than the burning of the live plant material.

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