• Low-energy Grubbing for Control of Junipers

      Wiedemann, H. T.; Cross, B. T. (Society for Range Management, 1981-05-01)
      Low-energy grubbing was effective and economical in controlling sparse to moderate stands of junipers infesting rangeland. A small, 48.5-kW (65-hp), shift-on-the-go crawler tractor, as compared to tractors larger than 74.5kW (100-hp) normally used, was adapted for grubbing by attaching a U-shape blade to the front mounted C-frame for root cutting at depths of 15 to 30 cm. A 98% plant kill was achieved because uprooting of trees below the bud-zone prevented sprouting. The newly designed hydraulic attachment significantly improved tree uprooting. Grubbing rate was a curvilinear function of juniper density and varied approximately from 4.0 to 0.5 ha/hr (10 to 1.25 ac/hr) to remove 80 to 500 trees/ha (30 to 200 trees/acre). Cost varied from $6.00 to $50.00/ha ($2.40 to $20.00/acre).
    • Livestock Grazing Impacts on Public Lands: A Viewpoint

      Holechek, J. L. (Society for Range Management, 1981-05-01)
    • Mulching, Furrowing, and Fallowing of Forage Plantings on Arizona Pinyon-Juniper Ranges

      Lavin, F.; Johnsen, T. N.; Gomm, F. B. (Society for Range Management, 1981-05-01)
      Mulching with plastic film, cinders, or juniper slash; deep furrowing; and fallowing increased penetration and retention of soil moisture, delayed soil surface crusting, and lowered seeding-zone temperatures in tests at five different pinyon-juniper range locations. Responses of seven forage species to these practices varied. The combination of plastic film mulching, deep furrowing, cinder mulching, and fallowing uniformly had resulted in greater soil moisture, more seedlings, and better early growth than other combinations. Plants under juniper slash had a longer growing season and were protected from excessive grazing by rabbits, with no evidence of toxic effects from the juniper. Cinder mulch increased seedling emergence and establishement, but in one year appeared to be toxic to the planted species. Deep furrowing generally had no advantage over surface drilling. Fallowing benefited pubescent wheatgrass and fourwing saltbush at a cold-moist pinyon-juniper site. The number of seedlings emerging gave little indication of the plant stand several years later.
    • Nodulation and Acetylene Reduction by Certain Rangeland Legume Species under Field Conditions

      Johnson, D. A.; Rumbaugh, M. D. (Society for Range Management, 1981-05-01)
      Acetylene reduction rates, N2[C2H2], were obtained to estimate nitrogen fixation by several introduced and native range legume species. The N2[C2H2] fixation rates of excised root segments with attached nodules were measured in the field for legumes from two mountain grassland sites, one native sagebrush-dominated site, and three cultivated former big sagebrush study sites. Sampling was conducted in the driest part of the growing season. Even during this high stress period, nodules were present and active in some legume species. Medicago sativa plants were particularly notable because of their capability of being nodulated and ability to reduce acetylene in dry soils when other legumes were not active. In addition, under the most favorable environmental conditions in this study, nodules from M. sativa reduced acetylene most actively at a rate of 26.2 micromoles ethylene/h/g nodule fresh weight. Although nodulation was generally less successful in New World than Old World lupine species, Lupinus mutabilis was capable of reducing acetylene at a rate of 4.97 micromoles ethylene/h/g nodule fresh weight, even in a severely water stressed environment. These results suggested that some legume species may be capable of fixing significant amounts of nitrogen on semiarid range sites.
    • The Binary Search for Accuracy in Plant Symbols

      Gibbens, R. P.; Bilan, T. N. (Society for Range Management, 1981-05-01)
      The transfer of data from field sheets to computer files always involves the risk of errors being made in plant symbols or other identifying codes. If a master list of symbols or codes is incorporated into the software programs used for data entry on CRT computer terminals the risk of making errors can be substantially reduced. This is done by utilizing the highly time efficient binary search to compare each entered symbol or code with the master list. Detection of errors before the data are transferred to computer files saves much time which would otherwise be spent in retrieving and correcting files.
    • Preliminary Observations on the Performance of Some Exotic Species of Atriplex in Saudi Arabia

      Hyder, S. Z. (Society for Range Management, 1981-05-01)
      Seeds of seven different Atriplex species (four from the United States and three from Australia) were germinated in the greenhouse and then transplanted to field plots at the Regional Agriculture and Water Research Center (RAWRC), located at Riyadh, Saudi Arabia. Data were obtained on vegetative growth, flowering, seed production, seed germination, and chemical composition of the plants. There were marked differences between species in vegetative growth. All flowered normally, but seed production and seed germination percentages differed among the species. All species were high in protein and ash content. Further field studies are underway at different sites within the Kingdom to test the potential value of Atriplex for the improvement of Saudi Arabian rangeland.
    • Translocation and Storage of 14 C-labled Total Nonstructural Carbohydrates in Honey Mesquite

      Fick, W. H.; Sosebee, R. E. (Society for Range Management, 1981-05-01)
      Translocation of total nonstructural carbohydrates (TNC) in mature honey mesquite (Prosopis glandulosa var. glandulosa) trees was studied by photosynthetically incorporating 14 CO2 on eight dates during the summer of 1975. Several plant parts were analyzed for TNC and relative total activity (RTA) to determine direction of translocation and sink strength. Stem and twig TNC fluctuated more than basal bud TNC in response to phenological development. Pods were generally the strongest TNC sink except during initial pod formation (June 25), when bidirectional translocation occurred and all plant parts sampled contained equal concentrations of the 14 C label. A RTA/TNC ratio used in conjunction with RTA and TNC suggested that increased TNC concentrations in the pods and stems may not always be due to increased import of TNC but caused by a reduction in growth with constant importation. Greatest translocation of TNC to the basal buds occurred between the phenological stages of green flower spikes (June 10) and pod formation (June 25) and during pod maturation (August 4 to August 19).
    • White-tailed Deer Diets from Pastures in Excellent and Poor Range Condition

      Bryant, F. C.; Taylor, C. A.; Merrill, L. B. (Society for Range Management, 1981-05-01)
      A study was initiated in August, 1975, to examine the forage available to and diet composition of white-tailed deer on pastures of excellent and poor range condition at the Sonora Research Station near Sonora, Texas. Grass and forb standing crop and deer feeding time on these two forage classes were considerably higher on the pasture in excellent range condition than that in poor range condition. Browse standing crop and feeding time was greater from the pasture in poor range condition. The Merrill 4-pasture grazing system appeared to increase the availability and use by deer of grass regrowth. Yearly averages of crude protein and phosphorus were higher in diet samples collected from the pasture in excellent range condition. Digestible energy levels were similar between pastures when averaged over the 1-year period. Digestible energy levels in diets were, however, higher from the excellent condition pasture in every season except winter. In winter, deer fed primarily on the foliage of oak on excellent condition range; but on the pasture in poor range condition, deer used large amounts of foliage and mast from juniper and dead leaves of persimmon in addition to oak foliage. Juniper and persimmon apparently contributed to the higher digestible energy levels observed on the pasture in poor range condition during the winter season. Energy may be a major nutrient limiting deer production on the Edwards Plateau.
    • Toxicity and Control of Kelsey Milkvetch

      Cronin, E. H.; Williams, M. C.; Olsen, J. D. (Society for Range Management, 1981-05-01)
      Kelsey milkvetch (Astragalus atropubescens Coult. and Fish.) contains miserotoxin (β-glucoside of 3-nitro-1-propanol). Chemical analyses and biological evaluations indicated moderately low concentrations of the toxin in this species. However, this plant has been implicated in cattle losses and a potential danger of both acute and chronic poisoning exists on grazing areas where kelsey milkvetch grows in abundance. It grows in mountainous areas in the Salmon River drainage in Idaho and the Big Hole River drainage in Montana. Kelsey milkvetch was controlled with an application of 2.24 kg/ha (2 lb/ac) of 2,4,5-T[2,4,5-tricholorophenoxy)acetic acid] and eradicated with an application of silvex [2-(2,4,5-tricholorophenoxy)propionic acid].
    • Sediment Production as Influenced by Livestock Grazing in the Texas Rolling Plains

      Wood, M. K.; Blackburn, W. H. (Society for Range Management, 1981-05-01)
      The influence of livestock on sediment production was evaluated on a Clay Flat range site with shrub canopy areas, and midgrass and shortgrass interspace areas in the Rolling Plains near Throckmorton, Texas. Sediment production in the shrub canopy areas was similar across grazing treatments of heavy and moderate stocking, continuous grazing; rested and grazed deferred-rotation; rested and grazed high intensity, low frequency (HILF); and two livestock exclosures which had not been grazed for 20 years. Sediment production from the shortgrass interspace area was similar for all grazing treatments except from the heavily stocked, continuously grazed pasture, where sediment production exceeded that of the rested HILF treatment. The midgrass interspace sediment production for the heavily stocked, continuously grazed treatment exceeded that of the deferred-rotation treatments and the exclosures. Likewise, sediment production for the grazed HILF treatment was greater than that for the rested deferred-rotation treatment and exclosure. Soil and vegetation variables which significantly influenced sediment production included aggregate stability, organic matter content, mulch, standing crop, bulk density, and ground cover.
    • Sand Dams as a Feasible Water Development for Arid Regions

      Sivils, B. E.; Brock, J. H. (Society for Range Management, 1981-05-01)
      Water development is an important aspect of range improvement, particularly in arid regions. A structure including a masonry dam and a collection field of perforated pipes was covered with coarse gravel and capped with sand to develop a low evaporation water source at a remote location. Animals were permitted access to the collected water at a downstream trough. Following development, previously unused forages were utilized by livestock for the first time.
    • Application of Remote Sensing to Prairie Dog Management

      Dalsted, K. J.; Sather-Blair, S.; Worcester, B. K.; Klukas, R. (Society for Range Management, 1981-05-01)
      The areal extent of prairie dog towns in Wind Cave National Park (WCNP) has increased at an alarming rate in the past 20 years. An inventory method was needed to replace the time and labor intensive ground survey method, i.e. rod and transit. Color infrared (CIR) aerial photography (1,370 m above ground) provided a useful product for rapidly and accurately delineating prairie dog towns. Extent was determined by measurements on the CIR film to be 608 ha or 5.3% of the total WCNP area. Ground measurements, taken near the time of the aircraft overflight, included general vegetation description of each prairie dog town and a vegetation sampling from 0.25 m2 plot on a stratified, random basis. The ground data helped explain and identify the variations recorded on the CIR film. Soil and topographic information were used with the CIR film to determine likely expansion potential and probable direction of growth of the 11 major prairie dog towns in WCNP. The prairie dog town inventory and expansion potential of each town has probable usefulness in the development of management plans.
    • Deer and Elk Use on Foothill Rangelands in Northeastern Oregon

      Miller, R. F.; Krueger, W. C.; Vavra, M. (Society for Range Management, 1981-05-01)
      Forested foothills of the Wallowa Mountains in northeastern Oregon provide spring and early summer range for deer and elk. Deer and elk use varied both between plant communities and seasonally within plant communities. Plant species composition of big game diets also varied with season. Bunchgrass and logged communities collectively occupying 57% of the land area studied, provided 90% of the big game diet during spring and early summer. Grasses made up 52% of the diet, forbs 38%, and browse 10%. Timothy and western goatsbeard were the two most important species consumed by big game. Pellet groups did not reliably estimate the value of various communities to deer and elk for forage use.
    • Diet Selection of Hereford, Angus X Hereford and Charolais X Hereford Cows and Calves

      Walker, J. W.; Hansen, R. M.; Rittenhouse, L. R. (Society for Range Management, 1981-05-01)
      Botanical composition of cattle diets of Hereford, Angus x Hereford and Charolais x Hereford cows and calves were compared to determine the effect of cattle age and/or breed on species selection. Multivariate analysis of variance showed small but significant differences between cow and calf diets and no differences among breeds. Similarity indices and Spearman's rank correlation coefficient showed a high degree of overlap and significant correlation between ages and among breeds. Differences between cow and calves among breeds were minor and of little value in range management.
    • Comparison of Herbage Production on Moderately Grazed and Ungrazed Western Ranges

      Lacey, J. R.; Van Poollen, H. W. (Society for Range Management, 1981-05-01)
      The hypothesis that there is no difference in the total amount of herbage produced on moderately grazed and ungrazed Western ranges was proposed and rejected. It was rejected because published literature shows that annual herbage production averaged 68 +/- 46% higher when plots were protected from a moderate level of livestock grazing. Likewise, herbage production of individual plants averaged 59 +/- 50% higher when they were protected, rather than clipped at a moderate level of use.
    • Diameter-Length,—Weight Relations for Blackbrush [Coleogyne ramosissima] Branches

      Provenza, F. D.; Urness, P. J. (Society for Range Management, 1981-05-01)
      Regression was used to relate branch diameter to branch length (r = 0.85) and weight (r2=0.94) for blackbrush plants in southwestern Utah. These regression equations were subsequently used to estimate blackbrush utilization by domestic goats in a browsing study. The diameter-length equation compared favorably with before-and-after measurements for accuracy and greatly reduced man-hour costs in determining utilization. Estimates of utilization based on the diameter-weight equation were less than estimates based on the before-and-after approach or the diameter-length equation; the diameter-weight equation accounted for leaves and thus provided a more accurate estimate of utilization.
    • Diets of Domestic Sheep and Other Large Herbivores in Southcentral Colorado

      MacCracken, J. G.; Hansen, R. M. (Society for Range Management, 1981-05-01)
      The botanical composition of herbage consumed by domestic sheep, mule deer, domestic cattle and elk from critical big game winter ranges in southcentral Colorado was studied using the fecal analysis technique. The food habits of domestic sheep grazed during the late spring overlapped those of mule deer by 15%, elk 46%, and domestic cattle by 53%. Mule deer diets were 10% similar to cattle and 30% to elk. Elk and cattle diets averaged 39% identical on the study area. The low similarity in diet between domestic stock and mule elk suggests that livestock grazing in the study area could be made compatible with the winter range needs of mule deer, but the potential competition between elk and domestic stock needs additional study.
    • Response of Bobwhites to Cover Changes within Three Grazing Systems

      Hammerquist-Wilson, M. M.; Crawford, J. A. (Society for Range Management, 1981-05-01)
      In south Texas bobwhites responded to short-term changes in the amount of vegetative cover within three grazing systems, two rotational and one continuous. Use by quail apparently was related to increases in amounts of bare ground and forb cover and decreases in grass cover.
    • Response of Western North Dakota Mixed Prairie to Intensive Clipping and Five Stages of Development

      Holderman, C. A.; Goetz, H. (Society for Range Management, 1981-05-01)
      The effects of clipping to a 2.54 cm (1 inch) height at 5 stages of development of western North Dakota mixed prairie were investigated. Soil moisture content at the beginning of the growing season had a greater effect on yields than did the clipping treatments. Observations from this two-year study indicate that soil moisture removal was not affected by the clipping treatments. Clipping significantly affected peak yields by needle-and-threadgrass (Stipa comata) and the Carex species during 1977; and the miscellaneous grasses (Agropyron smithii and Agropyron subsecundum) during 1978, at the sandy loam site. No significant differences in yields were observed for the other species and groups at the sandy loam site, or, the species and groups at the loam site for the two-year-period.