• Influence of Age and Awn Removal on Dormancy of Medusahead (Taeniatherum asperum) Seeds

      Nelson, J. R.; Wilson, A. M. (Society for Range Management, 1969-07-01)
      The effects of seed age and awn removal were studied in two medusahead strains having different post-maturity seed dormancy characteristics. Awn removal increased the percentage germination. The proximity of removed awns inhibited the germination of deawned seeds. Dormancy of intact seeds and inhibitory effects of awns decreased with increasing age of seeds.
    • Interseeding Sideoats Grama on the Texas High Plains

      Robertson, T. E.; Box, T. W. (Society for Range Management, 1969-07-01)
      Sideoats grama was interseeded in grass stands representing intermediate stages of succession near Amarillo, Texas. Seedings at 0.5-inch depth were more successful than at one-inch. Addition of 30 lb/acre nitrogen fertilizer or legume (alfalfa) to the seeding did not increase the seedling establishment. Better grass stands with less competition from non-seeded species was obtained from seeding in late May than in March, April, or June. Highest total survival of grass seedlings was also from the May seedings.
    • Is Deferment Always Needed After Chemical Control of Sagebrush?

      Smith, D. R. (Society for Range Management, 1969-07-01)
      The effects of 0, 1, 2, and 3 years of grazing deferment after sagebrush control were compared on subalpine ranges of the Big Horn Mountains in Wyoming. On units open to grazing, utilization of Idaho fescue was generally below the level which sustains yield under season-long grazing. Under such conditions, the desirable forage grasses quickly increased in vigor and revegetated the area after sagebrush was killed. Continued moderate utilization did not retard the revegetation process or influence the subsequent reinvasion of sagebrush.
    • Nature and Successional Status of Western Juniper Vegetation in Idaho

      Burkhardt, J. W.; Tisdale, E. W. (Society for Range Management, 1969-07-01)
      Western juniper invasion of sagebrush-bunchgrass vegetation in southwestern Idaho was verified. The invasion started about 1860 and is continuing at present. Juniper was found to be climax on rocky ridges and rimrocks where soil development is limited. Seral juniper stands were found on the deeper soils of valley slopes and bottoms. These sites were previously occupied by productive sagebrush-grass stands. It appears that juniper control would be more beneficial on invaded sites than on climax juniper sites.
    • Place of the range professional in worldwide agricultural development

      Hedrick, D. W. (Society for Range Management, 1969-07-01)
    • Plant Response and Cattle Gains on Sherman Big Bluegrass

      Currie, P. O. (Society for Range Management, 1969-07-01)
      Under season-long grazing of Sherman big bluegrass, utilization to a 4-inch stubble height was better than lighter or heavier grazing for sustained forage production and ground cover. Heavy grazing associated with drought resulted in severe deterioration of the grass stands. Beef gains from the recommended rate of grazing averaged 78 lb/acre. This beef gain was higher than for any other seeded or native species tested at the Manitou Experimental Forest, Colorado.
    • Quantitative Assessment of Grazing Behaviour of Sheep in Arid Areas

      Dudzinski, M. L.; Pahl, P. J.; Arnold, G. W. (Society for Range Management, 1969-07-01)
      Five indices are suggested to quantify components of spatial distribution of grazing sheep which were observed by aerial photography. Indices based on sheep numbers were more sensitive to environmental changes than those based on distances between sheep. It is suggested that the adjustment takes place by a change in the numbers within independently grazing flocks, while social contact between sheep, as reflected by various nearest-neighbour distances, remains unaltered.
    • Water Control by Rangeland Management

      Biswell, H. H. (Society for Range Management, 1969-07-01)
      In rangeland management, water quantity and quality are related to range condition. The better the range condition, the better the water relationships. Range condition can be improved by regulating grazing, reseeding, fertilizing, type conversions, and contour furrowing and pitting. Rangelands are highly variable in nearly every respect. The range manager must understand the climatic/topographic/soil/plant/animal/water relationships for the areas under his control; he must have sound management objectives; and he must be willing to work toward those objectives in so far as is economically feasible.
    • Water Use, Adaptability, and Chemical Composition of Grasses Seeded at High Elevations

      Tew, R. K. (Society for Range Management, 1969-07-01)
      Soil moisture depletion varied directly with extent of top and root growth of five grass species seeded on four areas between 6,500 and 8,500 ft in northern Utah. Smooth bromegrass and intermediate wheatgrass had greater root and top growth and used the most moisture at the lower elevation site where temperatures were highest, but timothy and orchardgrass grew best at higher elevations. Timothy contained low levels of nitrogen, phosphorus, and potassium on all sites, whereas tall oatgrass and orchardgrass contained high levels.
    • Yield of Crested Wheatgrass Following Release from Sagebrush Competition by 2,4-D

      Robertson, J. H. (Society for Range Management, 1969-07-01)
      Rate of increase in yield of crested wheatgrass following use of herbicide on associated sagebrush was measured over four years, including the year of treatment. Significant increases in yield, which were probably worthwhile economically, did not begin until the third year after spraying.