• Describing the Grass Inflorescence

      Allred, Kelly Wayne (Society for Range Management, 1982-09-01)
    • Early Secondary Succession Following Restoration and Reseeding Treatments in Northern Arizona

      Hessing, M. B.; Johnson, C. D. (Society for Range Management, 1982-09-01)
      Reseeding, with and without disc harrowing, building of water bars, and piling of slash on utility corridors (restoration), was studied on access roads and pylon sites following construction of the 500 kV Navajo Project Southern Transmission Line in 1973. Reseeding was not successful. Restoration either had no significant positive effect on revegetation or slowed plant succession in the following 4-year period, or had a deleterious effect on amount and quality of revegetation due to the destruction of climax vegetation which survived powerline construction.
    • Effect of Grazing Horses Managed as Manipulatros of Big Game Winter Range

      Reiner, Richard J.; Urness, Philip J. (Society for Range Management, 1982-09-01)
      A sagebrush-grass range in northern Utah, a critical winter area for deer and elk, was grazed by domestic horses in order to evaluate their potential to reduce selectively herbaceous vegetation which competes with bitterbrush (Purshia tridentata), an important big game winter forage. The diets of horses were recorded during spring and summer grazing under two stocking levels on small pastures. Horses consumed largely grass species throughout the study period in this high seral community. Forbs were important forage only under heavy stocking. No use of bitterbrush was recorded. Rate of forage disappearance, expressed on a per-animal-weight basis, was found to be lower on heavily stocked pastures. All pastures grazed by horses responded with increased seasonal twig production of bitterbrush over the non-grazed state. Seasonal twig production was greatest in response to heavy stocking during early July.
    • Effect of Range Condition on Density and Biomass of nematodes in a Mixed Prairie Ecosystem

      Smolik, J. D.; Lewis, J. K. (Society for Range Management, 1982-09-01)
      Nematode density and biomass were determined by taxa from exclosures in excellent or fair range condition in western South Dakota. Density of plant feeding nematodes in both treatments varied from 2 to 6 million/m2 to a depth of 60 cm. Biomass of plant feeders was greater in the excellent condition range due principally to high numbers of dagger nematodes (primarily Xiphinema americanum). The main contributors to biomass estimates in fair range condition were Tylenchida, principally stunt and spiral nematodes. Biomass of predaceous forms was similar to that of plant feeders. Microbial feeders, although numerous, constituted a relatively small proportion of biomass in both treatments. Approximately 70% of nematodes in all trophic levels occurred above 20-cm sampling depth in both range conditions. Stunt nematodes were nearly limited to the upper 10 cm of soil, with spiral nematodes predominating with increasing depth, particularly in fair condition range. Results indicate that nematode constitute a major portion of the faunistic biomass in a mixed prairie ecosystem.
    • Effects of Burning on the Algal Communities of a High Desert Soil near Wallsburg, Utah

      Johansen, Jeffrey R.; Javakul, Adehara; Rushforth, Samuel R. (Society for Range Management, 1982-09-01)
      A recently burned area near Wallsburg, Wasatch County, Utah, was sampled to determine if differences existed between the soil algal flora of a burned area and that of an adjacent ecologically similar unburned area. Soil samples were cultured and analyzed to determine presence and relative frequency of living algae. The frequency of visible algal patches present after eight days of culturing was much higher in the unburned soil samples than in the burned samples. Percent relative frequencies and absolute densities of diatoms were also determined. Diatom floras of the two areas were very similar. However, the absolute densities of diatoms were significantly greater in the unburned samples. The major effect of the burn was to decrease algal biomass, although the flora remained remarkably similar.
    • Effects of Controlled SO2 Exposure on Net Primary Production and Plant Biomass Dynamics

      Dodd, J. L.; Lauenroth, W. K.; Heitschmidt, R. K. (Society for Range Management, 1982-09-01)
      Objectives of this study were to determine effects of low level SO2 fumigation on above- and belowground plant biomass dynamics and aboveground net primary production. With two exceptions we were unable to measure significant effects on these parameters. Rates of increase in rhizome biomass over the 4-year period of the study were reduced by SO2 and indicate that longterm exposure of this grassland to low level SO2 may ultimately reduce the vigor of the perennating organs to a point where above- and belowground biomass dynamics will be altered, net primary production will be reduced, and species composition will be modified. In addition, production of Bromus japonicus, a cool-season annual grass, was reduced by SO2 fumigation.
    • Energy Analysis of Oklahoma Rangelands and Improved Pastures

      Klopatek, J. M.; Risser, P. G. (Society for Range Management, 1982-09-01)
      The energy costs of beef production were examined for native rangelands and improved pastures grazing systems in the State of Oklahoma. Energy analysis models were constructed to examine the necessary energy inputs and outputs of the grazing systems. Energy requirements to maintain improved pasture systems ranged from 10 to 100 times that to maintain native rangeland. Comparing only fossil-fuel expenditures showed that rangelands are two to three times more efficient producers of beef than the improved pastures, although their beef production is considerably lower per hectare. Regression analysis indicates that the maximum possible efficiency of beef production from fossil-fuel subsidies in Oklahoma is approximately 14.8%.
    • Establishing Circular Plot Boundaries with a Wedge Prism and an Adjustable Target Pole

      White, Elton W.; Lewis, Clifford E. (Society for Range Management, 1982-09-01)
      A target pole used with a wedge prism to establish a one-size circular plot has been modified so that one target pole and prism can be used to establish the perimeter of circular plots of different sizes by a simple adjustment.
    • Establishment of Honey Mesquite and Huisache on a Native Pasture

      Meyer, R. E.; Bovey, R. W. (Society for Range Management, 1982-09-01)
      Scarified honey mesquite [Prosopis juliflora (Swartz) DC. var. glandulosa (Torr.) Cockerell] and huisache [Acacia farnesiana (L.) Willd.] seeds were broadcast on a native pasture to study their ability to establish plants under several mechanical and chemical treatments. Plots were subjected to mowing, disking, or herbicide treatments. After 5 years, no more than 1 and 2% of the original honey mesquite and huisache seeds ultimately produced established plants. However, no treatment entirely prevented the establishment of either species. During the 3- to 5-year period following seeding, honey mesquite plant numbers increased with close mowing (3 to 5 cm high) and high mowing (25 to 30 cm high) without fertilization. Huisache plant numbers increased most prominently on the untreated plots, on plots mowed close and high but without fertilizer, and on plots sprayed with a 1.1 kg/ha of 2,4-D [(2,4-dichlorophenoxy)acetic acid] the year of seeding. Overall, the most effective treatment for controlling both species was 1.1 kg/ha of picloram (4-amino-3,5,6-trichloropicolinic acid) applied during the fall following seeding in the spring. Neither the treatments nor the brush cover affected herbaceous vegetative cover or estimated herbage yield during the 3- to 5-year period following seeding.
    • Estimating Browse Production by Deerbrush [Ceanothus integerrimus]

      Bartolome, James W.; Kosco, Barbara H. (Society for Range Management, 1982-09-01)
      This architectural model is designed to significantly refine browse weight estimates for deerbrush (Ceanothus integerrimus). Basal diameter of branches arising from the primary stem (2nd order stems) predicted leaf and branch weights with r2 = 0.97 using an allometric transformation in linear regression. Estimates based on secondary stem basal diameter rather than terminal shoots may be useful in a large number of similar shrub species.
    • Forage Yield and Quality in a Great Basin Shrub, Grass, and Legume Pasture Experiment

      Rumbaugh, M. D.; Johnson, D. A.; Van Epps, G. A. (Society for Range Management, 1982-09-01)
      A study was conducted in central Utah to determine the forage and protein yield relationships among the components of grass-shrub-legume plantings in a semiarid rangeland pasture. Forage and protein yields of crested wheatgrass (Agropyron cristatum) and total herbage increased when fourwing saltbush shrubs (Atriplex canescens) or legumes (Astragalus cicer, A. falcatus, or Medicago sativa) were grown in association. The shrub and legume species directly contributed to the increase in these yields and to more rapid regrowth of crested wheatgrass.
    • Habitat Relationships of Basin Wildrye in the High Mountain Valleys of Central Utah

      Walker, G. R.; Brotherson, J. D. (Society for Range Management, 1982-09-01)
      Habitat relationships between stands of basin wildrye (Elymus cinereus) and adjacent sagebrush-grass steppe were studied in the Strawberry Valley of central Utah. Fifteen sites of basin wildrye and 15 adjacent sites of sagebrush-grass steppe were selected and sampled for various biotic and abiotic environmental variables. Stands of basin wildrye were dominated by this grass (90% composition). The adjacent sagebrush-grass steppe exhibited more diversity of species and life forms. Basin wildrye and badger diggings were correlated 95% of the time. Potassium concentrations (P<.05) and soil depth (P<.01) were significantly greater in the basin wildrye sites. Secondary successional patterns were observed on disturbed sites.
    • In Vitro Digestibility of South Texas Range Plants Using Inoculum from Four Ruminant Species

      Blankenship, Lytle H.; Varner, Larry W.; Lynch, Gregory W. (Society for Range Management, 1982-09-01)
      Differences in the in vitro digestible dry matter (DDM) of 26 native forage species in south Texas were determined using rumen inoculum from white-tailed deer, sheep, goat, and steer. The mean DDM of all forages was significantly different for each animal species (P<.05). Deer was the most efficient overall digestor of forbs, shrubs, and prickly pear. Of the grasses sampled, the goat was the most efficient digestor with the steer second. In overall efficiency of digestion of all forages tested, the deer was highest with 52.5%, goat with 49.2%, sheep with 47.5%, and steer with 46.6%. These data indicate that caution should be exercised when using inoculum from one ruminant species to estimate DDM for another species. Certain plant species were determined to meet the TDN requirements for maintenance levels of the four ruminants.
    • Interrelationships of Huisache Canopy Cover with Range Forage on the Costal Prairie

      Scifres, C. J.; Mutz, J. L.; Whitson, R. E.; Drawe, D. L. (Society for Range Management, 1982-09-01)
      Grass production was monitored based on seasonal harvests under various canopy covers of huisache on a Coastal Prairie blackland range site during 1978 and 1979. Grass production (Y) was not decreased in 1978, compared to that on essentially brush-free areas, until huisache canopy cover (X) exceeded 30% based on the relationship, the average of Y = 2,346 + 20X - $0.62X^2. Texas wintergrass standing crop apparently increased as huisache canopy cover increased to 25%, and its growth during winter partly compensated for standing crop losses of warm season species during the winter. In 1979, the contribution of the cool-season species was masked by greater production of warm-season species. Consequently, grass production decreased with increasing huisache canopy cover according to the relationship, the average of Y = 4,047 - 14.9X - $0.29X^2. Based on the functional relationship the average of Y = a – b1X-b2X^2, coefficients of determinations (r2) ranged from 0.50 to 0.96 when estimates of annual production of grasses or production for the growing season only were regressed against huisache canopy cover.
    • Partial Defoliation Stimulates Growth of Arizona Cottontop

      Cable, Dwight R. (Society for Range Management, 1982-09-01)
      Responses of Arizona cottontop to partial defoliation were determined by removal of the terminal growing point in the latter half of July of basal culms that were in various stages of development at the time. If soil moisture was available cottontop responded well to grazing throughout its growing season. Removal of the growing point stimulated axillary shoot growth regardless of the stage of development.
    • Seasonal Dependence on Federal Forage in Colorado

      Taylor, R. G.; Bartlett, E. T.; Lair, Kenneth D. (Society for Range Management, 1982-09-01)
      Thirty-six percent of Colorado is federal land administered by the U.S. Forest Service or Bureau of Land Management, which provides approximately 2.4 million AUM's of grazing for domestic livestock. This represents 28% of the total forage resources used by the 2200 ranchers that use federal forage in Colorado. Seasonal dependence on federal forage is greatest in summer, averaging over 50%. High seasonal dependence where few viable alternative forage sources exist makes federal forage critical to Colorado ranchers. Dependence on federal forage also varies with ranch size. Dependence varies inversely with size of cattle ranches, but varies directly with size of sheep ranches.
    • Seasonal Variations in Protein and Mineral Content of Fringed Sagewort [Artemisia frigida]

      Rauzi, Frank (Society for Range Management, 1982-09-01)
      Fringed sagewort (Artemisia frigida) was collected biweekly from May 15 through October 4, 1979, from a loamy range site near Cheyenne, Wyo. Crude protein, calcium, iron, potassium, magnesium, manganese, phosphorus, sodium, and zinc were determined on the collected plant material. After July 12, leaves and flowers were stripped from the stems and analyzed separately. Crude protein and mineral concentrations in the (fringed sagewort) plant material generally decreased with the advance of the growing season. Except for phosphorus and crude protein content in the stems after late July, the nutritional value was adequate. Fringed sagewort is considered to be of minor importance but is an important forage plant for wildlife and, to a lesser extent, for livestock use.
    • Some Consequences of Competition between Prairie Dogs and Beef Cattle

      O'Meilia, M. E.; Knopf, F. L.; Lewis, J. C. (Society for Range Management, 1982-09-01)
      Competition for range herbage between black-tailed prairie dogs (Cynomys ludovicianus) and steers was evaluated in terms of the effects prairie dogs have on herbage availability and use, and steer weight gains. Pastures grazed only by steers were termed control pastures and pastures grazed by prairie dogs and steers were designated treatment pastures. Small mammals and arthropods were monitored to determine if prairie dogs influence populations of these animals. Prairie dogs decreased herbage availability, which apparently led to reduced utilization by cattle during 1977 and 1978. The influence of prairie dogs on the herbage crop did not cause a statistically significant reduction in steer weight gains. However, the lower weight gains of treatment steers amounted to market values of $14-$24/steer less than control steers. The presence of prairie dogs appears to improve herbage quality, thus partially compensating the reduction in herbage available to steers. Pastures containing prairie dogs also supported a greater biomass of small mammals. Arthropod (mainly grasshopper) biomass in August was more than three times higher in control pastures than in treatment pastures.
    • Standing Crop and Vigor of Defoliated Russian Wildrye in Southeastern Colorado

      Svejcar, Tony; Rittenhouse, Larry R. (Society for Range Management, 1982-09-01)
      Russian wildrye plants were clipped at all possible combinations of three clipping dates (April 15, May 15, June 15) at two intensities (35 and 65% harvest of current year's growth). From 1974-1977 increasing frequency and intensity of defoliations increased total biomass removed over the 4-year period. There was no trend for reduced yield over time with any clipping treatment. However, percent plant crown alive (1976-1978) and end-of-season standing crop (1978) both indicated that increasing frequency and/or intensity of defoliation decreased plant vigor.