• Conversion of Medusahead to Downy Brome Communities with Diuron

      Young, J. A.; Evans, R. A. (Society for Range Management, 1972-01-01)
      Application of 2 lb./acre of the herbicide diuron changes rangeland communities from medusahead to downy brome dominance. This conversion lasted for at least 3 years and greatly increased utilizable forage.
    • Chemical Composition and Fertilizer Response of Two Range Plants in Relation to Grass Tetany

      Azevedo, J.; Rendig, V. V. (Society for Range Management, 1972-01-01)
      The chemical response of two species of annual range plants, soft chess and broad-leaf filaree, to nitrogen and potassium fertilization was studied in a field plot trial in Amador County, California. Heavy losses of cows due to grass tetany have been reported from that vicinity in recent years. The K/(Ca + Mg) ratio in soft chess was significantly higher than that in broad-leaf filaree, and fertilization with N and K increased the ratio in both species. Fertilization increased the concentration of K in broad-leaf filaree, but had little effect on the concentrations of Ca and Mg. In contrast, fertilization decreased the Ca and Mg percentages in soft chess but did not change the K concentration. The presence of alkaloids in soft chess was detected by a "spot-test" technique.
    • Carbohydrate Reserves of Intermediate Wheatgrass after Clipping and Etiolation Treatments

      Ogden, P. R.; Loomis, W. E. (Society for Range Management, 1972-01-01)
      The total water-soluble carbohydrate (TWSC) fraction of intermediate wheatgrass stem bases and roots is depleted with etiolation and is a good measure of the reserve energy of this species. When the TWSC fraction was depleted to about 1% dry weight, vigor of the grass was too poor to recover from a clipping treatment. Root weight was also reduced with etiolation. Late September to early November was a period of active herbage and root growth for intermediate wheatgrass. Growth during this fall period enabled grasses which had been clipped three times at 6-week intervals during the summer to recover to very nearly the level of TWSC and root weight as the check plants.
    • Bitterbrush Seedling Establishment as Influenced by Soil Moisture and Soil Surface Temperature

      Ferguson, R. B. (Society for Range Management, 1972-01-01)
      Bitterbrush seeds exposed to field conditions for 80 days following seed fall exhibited reduced viability. Exposure of seeds to dry heat for periods up to 15 consecutive hours in the laboratory did not reduce germination percentage until temperature exceeded 176 F. No evidence was found that high soil surface temperatures resulted in seedling mortality. Seedling survival and growth were significantly affected by both artificial watering and slope exposure.
    • Beef Production on Lodgepole Pine-Pinegrass Range in the Cariboo Region of British Columbia

      McLean, A. (Society for Range Management, 1972-01-01)
      Results from the Cariboo grazing trail confirm those from previous ones on lodgepole pine-pinegrass summer range near Kamloops. They also suggest that similar results could be expected in other regions with ecologically similar sites. Yearling steers in the Cariboo district had a 3-year average daily gain of 1.74 lb. for 97 days starting in early June. The average gain per acre was 17.8 lb. The average carrying capacity was 4.6 acres/animal unit month.