• Response of Wavyleaf Oak to Nitrogen Fertilization

      Howard, V. W.; Cox, J. R.; Southward, G. M. (Society for Range Management, 1980-11-01)
      This study was conducted to determine the response of wavyleaf oak to nitrogen fertilization, at rates of 0, 112, and 224 kg of elemental nitrogen per ha. Over the three years of the study, twigs were longer on fertilized areas than on unfertilized areas. Nitrogen at 112 kg/ha was generally as effective as 224 kg/ha in stimulating twig growth. Slope position did not have an effect on all sites. Where slope position was significant, plants on the upper and middle slopes responded better to fertilization than did plants growing on lower slopes. Site appeared to influence twig growth more than slope. Differences in twig growth among sites were attributed to differences in soil depth and density of vegetation. Twig length was significantly different among years due to uneven distribution of rainfall.
    • Salt Tolerance of Two Saltbush Species Grown in Processed Oil Shale

      Richardson, S. G.; McKell, C. M. (Society for Range Management, 1980-11-01)
      The tolerance of fourwing saltbush (Atriplex canescens) and cuneate saltbush (Atriplex cuneata) to the salts in processed oil shale was studied in a greenhouse experiment over an Ece range of 4 to 38 mmho/cm. Growth responses differed, depending on the species and the particular salt or salts in the soil solution. Cuneate saltbush was more salt tolerant than fourwing saltbush, but both species survived and grew at salinities as high as 38 mmho/cm. Because of their high salt tolerance these saltbush species may be very important for use in the rehabilitation of processed oil shale disposal sites.
    • Townsend Ground Squirrel Diets in the Shrub-Steppe of Southcentral Washington

      Rogers, L. E.; Gano, K. A. (Society for Range Management, 1980-11-01)
      Microscopic study of fecal pellets from Townsend ground squirrels occupying the shrub steppe region of southcentral Washington showed that squirrels preferred to feed on bluegrass (Poa sp.) and forbs (Descurainia pinnata and Lupinus laxiflorus); phlox (Phlox longifolia) may also be a favored food item. Bluebunch wheatgrass (Agropyron spicatum), six-weeks fescue (Festuca octoflora), and lomatium (Lomatium macrocarpum) were avoided. No significant differences between diets of ground squirrels occupying grazed and ungrazed study areas or between diets of male and female or adult and subadult ground squirrels were found.