• Nitrogen Fixation (Acetylene Reduction) Associated with Rhizosheaths of Indian Ricegrass Used in Stabilization of the Slick Rock, Colorado Tailings Pile

      Wullstein, L. H. (Society for Range Management, 1980-05-01)
      Indian ricegrass sown on a sandy soil covering a uranium mine tailings exhibited associative nitrogen fixation (acetylene reduction). Acetylene reduction rates for whole plants varied from 2,100 to 19,500 nm/4 days. Nitrogen fixation was associated with the rhizosheaths. It is suggested that the reclamation of mine tailings in arid climates may be facilitated by stabilizing sandy textured coverings with rhizosheath-forming grasses.
    • Relationship of Distance Traveled with Diet and Weather for Hereford Heifers

      Ueckert, D. N.; Anderson, D. M.; Kothmann, M. M. (Society for Range Management, 1980-05-01)
      Distance traveled by Hereford heifers under continuous and high-intensity low-frequency (HILF) grazing was highly correlated with crude protein, digestible energy, forb content, and the ratio of grass leaf blade to stem plus leaf sheath obtained from diets collected via esophageal fistula. Observations confirmed that availability of palatable forbs was positively correlated with animal travel under HILF grazing management. Animal travel decreased under both management systems between July and December. Maximum diurnal temperatures and maximum diurnal water vapor, expressed as maximum mixing ratio, were significantly associated with travel under HILF grazing. Calculations indicated that the energy cost associated with horizontal travel for range cattle is greater than that allowed in the basal metabolism requirement set forth by the National Research Council.
    • Snow Trapping by Contour Furrows in Southeastern Montana

      Neff, E. L. (Society for Range Management, 1980-05-01)
      Contour furrows on fine-textured range sites in southeastern Montana caught an annual average of 22 mm more snow equivalent than nearby nonfurrowed areas. In addition, the furrows held snowmelt onsite in the spring and significantly reduced winter runoff in nearly half of the years of record. Except in years of much below normal winter precipitation, however, the winter runoff from furrowed areas was still more than adequate to fill well-designed stockponds.
    • Soil-Ingestion Rates of Steers Following Brush Management in Central Texas

      Kirby, D. R.; Suth, J. W. (Society for Range Management, 1980-05-01)
      Fecal soil concentrations and soil-ingestion rates were estimated for steers grazing pastures treated 1 year prior with herbicide or bulldozing and stacking. Mean fecal soil concentration was higher on mechanically treated, 16.6%, than those chemically treated, 12.5%, or untreated, 10.9%, under similar forage utilization levels (50%). With one exception, fecal soil concentration decreased over the study period on treated pastures. Fecal soil concentration was correlated with forb availability (r = 0.72) and percentage bare ground (r = 0.85) on treated pastures. At the forage utilization level of this study, no relationship between fecal soil concentration and stocking pressure was apparent.
    • Transforming a Traditional Forage/Livestock System to Improve Human Nutrition in Tropical Africa

      Sullivan, G. M.; Stokes, K. W.; Farris, D. E.; Nelsen, T. C.; Cartwright, T. C. (Society for Range Management, 1980-05-01)
      Livestock systems based on uncontrolled communal grazing result in inefficient utilization of native forages and low livestock production. Forage/livestock herd simulation models are adapted to Tanzania to evaluate a case of improved technology. A hay enterprise for lactating cows, not possible with uncontrolled communal grazing, was found to increase nutritional and monetary welfare of a typical village.