• Relationship Between Selected Factors and Internal Rate of Return from Sagebrush Removal and Seeding Crested Wheatgrass

      Shane, R. L.; Garrett, J. R.; Lucier, G. S. (Society for Range Management, 1983-11-01)
      One alternative in increasing western range forage production is sagebrush removal and seeding crested wheatgrass. Of primary importance when considering such investments is economic profitability. Using internal rate of return (IRR) as a measure of economic profitability, a range improvement computer budget program (RIBPRO) was used to calculate IRR's for a specific ranch example. Factors associated with high IRR's are a constant forage production function over time, agricultural conservation payments, a 30-year or older stand, approximately 80 ha or more of improved range, low initial user cost/ha, and high additional kg of forage/ha.
    • Relationships of Site Characteristics to Vegetation in Canyon Grasslands of West Central Idaho and Adjacent Areas

      Tisdale, E. W.; Bramble-Brodahl, M. (Society for Range Management, 1983-11-01)
      The relation of vegetation types to soil and other site characteristics was examined for 57 sample plots representing the Pacific Northwest Bunchgrass Region. Three series characterized by Carex spp., Festuca idahoensis, and Agropyron spicatum respectively, and 5 habitat types comprised the vegetation units. These were compared to their associated soil taxa (soil families) and to a group of individual soil and other site characteristics. Relationship to soil taxa was relatively weak, with several soil families associated with each of 4 of the habitat types. Strong relationship of vegetation types to 13 individual soil and site factors was shown by means of stepwise discriminant analysis. Reclassification by these site factors resulted in 92% concurrence with habitat types and even higher agreement with vegetation series. Site factors showing the highest degree of relationship with vegetation units were: elevation, radiation index, color (value), and organic matter of the "A" horizon, and lime depth. This method of relating individual site factors to vegetation provides a powerful tool for testing the validity of ecosystems recognized by vegetation, and should be useful also in categorizing sites where plant cover has been disturbed.
    • Residual Effects of Liquid Digested Sludge on the Quality of Broomsedge in a Pine Plantation

      Dunavin, L. S.; Lutrick, M. C. (Society for Range Management, 1983-11-01)
      Broomsedge (Andropogon virginicus L.) is generally looked upon with some disfavor as a weed but has been utilized for grazing. Liquid digested sludge (LDS) has been tested as a fertilizer on tree plantations where broomsedge comprises a portion of the understory. Broomsedge samples were collected 4 years after treatment of a slash pine (Pinus caribaea More.) plantation with LDS containing 0, 21.6, 40.5, 62.1, 83.7, and 102.6 t/ha of dry solids. Sludge was applied both as a top application and incorporated prior to tree planting. Crude protein (CP) of grass samples was generally increased with an increase in sludge application. In vitro organic matter digestibility (IVOMD) appeared to decrease with increased sludge application under conditions of top application only. The understory at the 0 and 21.6 t/ha-rates of sludge was about 67% broomsedge. At the higher sludge rates, the understory was only 10% broomsedge or less.
    • Sod-Seeding Alfalfa into Cool-season Grasses and Grass-Alfalfa Mixtures Using Glyphosate or Paraquat

      Vogel, K. P.; Kehr, W. R.; Anderson, B. E. (Society for Range Management, 1983-11-01)
      Sod-seeding alfalfa into swards of smooth and meadow bromegrass, tall and intermediate wheatgrass, and orchardgrass and mixtures of these grasses with alfalfa using glyphosate or paraquat to suppress the existing vegetation was evaluated. Glyphosate (1.7 kg/ha) or paraquat (0.6 kg/ha) was applied 12 days prior to sod-seeding alfalfa (645 PLS/m2). Glyphosate completely suppressed or killed all the grasses and as a result, excellent stands of alfalfa were obtained producing 5.8 to 6.4 Mg/ha the establishment year at Mead, Neb., without irrigation. The grass-alfalfa mixtures were also converted into pure stands of alfalfa by using glyphosate. Glyphosate suppressed but did not kill the existing alfalfa. Sod-seeding in pure stands of grasses following paraquat application produced stands that were approximately 50% grass and 50% alfalfa. Paraquat had a limited suppressive effect on alfalfa and sod-seeded alfalfa did not become established in plots containing old alfalfa.
    • The Behaviour of Free-ranging Cattle on an Alpine Range in Australia

      Rees, H. Van.; Hutson, G. D. (Society for Range Management, 1983-11-01)
      The behaviour of free-ranging cattle on the Bogong High Plains, Victoria, was investigated during 2 summer grazing seasons. The main influence on cattle distribution was found to be their preferences for particular vegetation communities. Cattle preferred to graze in grassland and closed heathland and avoided mossbeds. Cattle preferred to rest on grassland, wet grassland, and at cattle camps. The interaction of cattle with mossbeds, the vegetation community most susceptible to disturbance, was investigated in detail. Cattle visited mossbeds primarily to drink, although a small number of animals entered them to graze.
    • The Initial Growth of Two Range Grasses on Nonfertilized and Fertilized Soils Collected from Creosotebush Communities in the Southwestern United States

      Cox, J. R.; Schreiber, H. A.; Morton, H. L. (Society for Range Management, 1983-11-01)
      A glasshouse study was conducted to determine how nonfertilized and fertilized soils collected in creosotebush [Larrea tridentata (DC.) Cov.] communities would influence seedling leaf growth and shoot production of Lehmann lovegrass (Eragrostis lehmanniana Nees) and blue panicgrass (Panicum antidotale Ritz.). Soils were collected at 3 locations around creosotebush plants: (1) at the crown base (Basal), (2) along the outer canopy edge (Drip), and (3) in areas between plants (Open). Leaf lengths and shoot production were greatest on nonfertilized soils collected at the plant base, intermediate at the canopy edge, and least in open areas. Leaf lengths and shoot production significantly increased on fertilized soils collected in open areas.
    • Total Urine Collection from Free-grazing Heifers

      Stillwell, M. A.; Senft, R.; Rittenhouse, L. R. (Society for Range Management, 1983-11-01)
      A urine collection device for female bovines is described. This device allows simulataneous collections of urine and feces, is reusable, and is designed for use on free grazing animals. Tests of the device were successful and showed no major problems under field conditions.
    • Using Precipitation to Predict Range Herbage Production in Southwestern Idaho

      Hanson, C. L.; Morris, R. P.; Wight, J. R. (Society for Range Management, 1983-11-01)
      Analyses of 9 years of herbage yield and precipitation data from the Reynolds Creek Experimental Watershed in southwest Idaho show that annual herbage yield can be estimated by the Sneva and Hyder procedure (Sneva and Hyder 1962a, 1962b) at locations other than where their procedure was developed. These analyses did indicate that for sites below 1,680 m, their procedure was more useful when the crop-year precipitation index was based on a variable number of winter and spring months, rather than September through June. For sites above 1680 m, using winter and spring separately in a modified form of their basic equation may improve yield predictions.
    • Water Properties of Caliche

      Hennessy, J. T.; Gibbens, R. P.; Tromble, J. M.; Cardenas, M. (Society for Range Management, 1983-11-01)
      Water absorption and retention by hard caliche nodules (rocks) collected from soils in southern New Mexico were determined. The rate of water uptake by the caliche rocks was rapid and water content at saturation was 13.0% by weight (24.7% by volume). At a matrix potential of -0.7 MPa, the rocks retained 10.6% water by weight, an 18% loss from saturation. Water loss from saturated rocks to a dry atmosphere was slow, but most of the absorbed water was released. The rocks contained only 0.6% water by weight (1.1% by volume) after 34 days in a desiccator. Both laboratory and field trials indicated that, although indurated caliche layers will absorb large amounts of water, the water does not pass through the layers to the soil below.