• Forage Losses Caused by the Grasshopper Aulocara elliotti on Shortgrass Rangeland

      Hewitt, G. B.; Burleson, W. H.; Onsager, J. A. (Society for Range Management, 1976-09-01)
      A field-cage study was conducted in 1973 and 1974 to determine the amount of forage (mainly grasses) destroyed by different population densities of the grasshopper Aulocara elliotti. The amount of forage consumed during the third instar and through the adult stage averaged 34.5 mg of forage per grasshopper per day. Thus, an estimated loss of 23.1 lb of forage per acre will result from a density of one Aulocara/m2 if the grasshopper lives for 75 days (45 days as a nymph and 30 days as an adult). Based on total available forage (standing dead and new growth), a 63% forage loss was recorded in 1973 at one site and losses of 26% and 29% at two sites in 1974 resulting from about 20 grasshoppers/m2. Severe grazing by grasshoppers also resulted in reduced production of forage during the subsequent (1974) season.
    • Granular herbicide applicator for brush control

      Flynt, T. O.; Bovey, R. W.; Meyer, R. E.; Riley, T. E.; Baur, J. R. (Society for Range Management, 1976-09-01)
      An applicator was constructed and mounted on a tractor to accurately apply granular or pelleted herbicides in continuous narrow bands at various spacings to soils supporting infestations of brush. The metering mechanism consisted of a rotating disc suspended directly over an opening in the bottom of a hopper. Uniformity of granule output could be calibrated within < 5% error.
    • Influence of Fertilization and Supplemental Runoff Water on Production and Nitrogen Content of Western Wheatgrass and Smooth Brome

      Hanson, C. L.; Schumaker, G. A.; Erickson, C. J. (Society for Range Management, 1976-09-01)
      Simulated water spreading and nitrogen fertilization were studied on soils developed from Pierre Shales in western South Dakota. When both supplemental water and nitrogen fertilizer were applied, forage yields increased almost nine-fold. Western wheatgrass and smooth brome yields ranged from about 1,000 lb/acre on the untreated control to about 8,700 lb/acre with optimum supplemental water and 320 lb/acre nitrogen fertilizer. Forage yields increased with April and June supplemental water as compared with annual application in either April or June. Nitrogen content of harvested hay increased as nitrogen application rate increased above 80 lb/acre. Percent nitrogen decreased with increased supplemental water and ranged from about 1.2 to 2.2% in western wheatgrass and from about 1.0 to 2.3% in smooth brome. Least squares analysis, considering all nitrogen and water treatments, indicated that each lb/acre of nitrogen fertilizer applied increased the forage yield by about 19 lb/acre, and that each inch of additional water increased forage yields by about 50 lb/acre.
    • Cattle Use on Summer Foothill Rangelands in Northeastern Oregon

      Miller, R. F.; Krueger, W. C. (Society for Range Management, 1976-09-01)
      The importance of several plant communities for summer cattle range was evaluated. Based on understory production, eight communities were separated into three groups, i.e., bunchgrass, forested, and clearcut forested. Forested communities that had been clearcut and seeded to forage were the most productive. Soil depth and canopy cover were dominant environmental factors determining understory production on the study area. These two variables accounted for 96% of the variability in understory production. Clearcut forested communities seeded to forage provided 63% of the forage consumed by cattle and made up 31% of the study area. Seeded grasses accounted for 55% of the cattle diet. Environmental factors highly correlated with utilization by cattle during the summer were distance to salt and water, soil depth, and canopy cover. Relations of soil depth and canopy cover were a result of their influence on plant growth. There appeared to be no direct forage competition between big game and cattle when livestock were present during the last half of summer.
    • Cattle Losses, Tall Larkspur, and Their Control

      Cronin, E. H.; Nielsen, D. B.; Madson, N. (Society for Range Management, 1976-09-01)
      Correlation analyses of records of cattle poisoned by tall larkspur (Delphinium barbeyi Huth.) on three similar and adjacent cattle allotments on the Wasatch Plateau produced low r2, indicating that losses are not related to annual fluctuations in environmental conditions or other factors shared by all three allotments. Control of the large, dense patches of tall larkspur with herbicides in one 2,000 acre subalpine pasture on the Manti Canyon Cattle Allotment dramatically reduced cattle losses. Small patches and scattered plants, which are difficult to locate and laborious to treat, apparently contribute very little to cattle losses. Examination of ruminal contents of calves found dead in the subalpine pasture in a 2-year period revealed large quantities of tall larkspur. None of the calves were orphans. All evidence suggests that the calves dying in the subalpine pastures were poisoned by tall larkspur. While mature cattle ingest lethal levels of tall larkspur in the large, dense patches, calves are apparently intoxicated by ingesting tall larkspur growing in small patches in the groves of trees scattered over the subalpine grazing units.
    • Soil Compaction in Eastern Nebraska After 25 Years of Cattle Grazing Management and Weed Control

      McCarty, M. K.; Mazurak, A. P. (Society for Range Management, 1976-09-01)
      The effect of 25 years of weed control and grazing management on several physical properties of surface soil was measured. Bulk density of continuously grazed plots was 1.22 g/cm3 in the top 7.6 cm of soil as compared to 1.14 g/cm3 on deferred and rotationally grazed plots, and 1.02 g/cm3 on plots protected from grazing. Saturated hydraulic conductivities of 7.6 cm top soil cores from the protected plots were four times higher than from the two grazed plots. Those for warm-season grasses averaged 28.3 cm/hour, whereas mowed and smooth brome plots averaged 14.8 cm/hour. The value for the continuously grazed mowed plots was 3.0 cm/hour. The effect of long-term weed control and grazing management was reflected in the physical properties of soil which, in turn, influenced forage production by the increased water entry into soil.
    • Summer Diets of Steers on a Deep Hardland Range Site of the Texas High Plains

      McClung, J. E.; Albin, R. C.; Schuster, J. L. (Society for Range Management, 1976-09-01)
      Botanical and chemical compositions of the summer diets of esophageal-fistulated steers were determined on a deep hardland shortgrass range site of the Texas High Plains. Consumption of belvedere summercypress was highest in June, but decreased to September; whereas, consumption of blue grama, buffalograss, and sand dropseed increased during this period. Belvedere summercypress was eaten in considerable quantities until it approached dormancy. Dietary crude protein and calcium percentages were highest in June, but declined to September. Daily forage consumption averaged 10.9 kg during June and July. A forage utilization of 17.4% was obtained during the summer grazing period and the steers gained an average of .45 kg/day.
    • Survival of Cool-Season Species under Texas-Pecos Conditions

      Kemph, G. S.; Schuster, J. L.; Welch, T. G. (Society for Range Management, 1976-09-01)
      Four cool-season species were grown for 1 year under controlled conditions simulating a dry, a typical, and a wet fall planting season in far west Texas. Crested wheatgrass and Russian wildrye had higher survival percentages than sideoats grama at the end of the study. Both species appear capable of reducing the cool-season forage shortage in the Trans-Pecos region of Texas. Neither wintergreen hardinggrass nor burnet appear adapted to the Trans-Pecos. Seedling morphology did not affect plant survival.
    • Yields of Dissolved Solids from Aspen-Grassland and Spruce-Fir Watersheds in Southwestern Alberta

      Singh, T. (Society for Range Management, 1976-09-01)
      Water quality samples representing various flow conditions were collected from the main creeks of Streeter and Marmot experimental watersheds in southwestern Alberta. Total dissolved solids were determined gravimetrically after evaporating aliquots of filtered samples. An excellent correlation between stream discharge and yield of dissolved solids was found in the two watersheds. The regression models thus established were used to estimate the yields of total dissolved solids from the streamflow data on a daily, monthly, and annual basis. The highest yield occurred in the month of June and the lowest during the low-flow months of winter. The yield of total dissolved solids transported annually amounted to 27 metric tons per square kilometer for aspen-grassland vegetation, compared to 69 metric tons per square kilometer for spruce-fir forest.
    • Stratification of Bitterbrush Seeds

      Young, J. A.; Evans, R. A. (Society for Range Management, 1976-09-01)
      The influence of temperature and moisture availability during stratification on the subsequent germination of bitterbrush (Purshia tridentata) seeds was investigated. The threshold for adequate stratification temperatures was abrupt. Temperatures above 5 degrees C were too warm and below 0 degrees C, too cold for stratification; 2 degrees C was optimum for the longest duration. Prolonged stratification resulted in decreased viability, apparently from microbial activity and early germination. Stratification in osmotic solutions produced with polyethylene glycol was totally ineffective. Soil water stress reduced the effectiveness of stratification, especially with sand as a substrate. Any departure from optimum temperature and moisture regimes prolonged the time required for stratification or negated any effect of the stratification treatment.
    • Steer Gains under Six Systems of Coastal Bermudagrass Utilization

      Hart, R. H.; Marchant, W. H.; Butler, J. L.; Hellwig, R. E.; McCormick, W. C.; Southwell, B. L.; Burton, G. W. (Society for Range Management, 1976-09-01)
      Steer gains on 'Coastal' Bermudagrass (Cynodon dactylon (L.) Pers.), utilized by continuous, weekly rotation, or daily strip grazing, or green chop, dehydrated hay, or pellet feeding, were studied for 3 years. Previous studies had included fewer methods of utilization, or had run for only a short time. Average daily gains and gains per hectare were: continuous, 594 g and 600 kg; rotation, 449 g and 469 kg; strip, 392 g and 487 kg; green chop, 369 g and 647 kg; hay, 671 g and 971 kg; and pellets, 800 g and 967 kg. Differences among grazing methods in average daily gain were largely accounted for by differences in grazing pressure. Differences among feeding methods reflected differences in forage intake and lignin content of the forage. Seasonal changes in gain and forage intake were influenced by seasonal changes in lignin content and increasing steer weights.
    • Some Major Plant Toxicities of the Western United States

      James, L. F.; Johnson, A. E. (Society for Range Management, 1976-09-01)
      Poisonous plants rank high among the causes of economic loss to the livestock industry. Losses come not only through death and disability of livestock but through costs associated with interference with management programs such as additional fencing and altered grazing program. One of the best means of avoiding poisonous plant problems is by complete familiarity with poisonous plants likely to be encountered by livestock. Important plants causing congenital birth defects; plants containing cyanide, oxalate, nitrates, selenium, and pyrrolizidine alkaloids; as well as a few specific plants as larkspurs and hemlock and those producing photosensitization are reviewed briefly and results of more recent research are considered.
    • A Matrix Model of a Rangeland Grazing System

      Redetzke, K. A.; Van Dyne, G. M. (Society for Range Management, 1976-09-01)
      A matrix model developed from actual field data from long-term grazing intensity studies was designed to predict grazing systems dynamics. For a given pasture with acreages in several different soil types and a particular stocking rate, the model predicts plant cover and animal production changes in response to variable weather input. The model system is composed of a set of matrix equations, with specific transition matrices for each combination of soil type, grazing intensity, and weather category. Model validation tests were made. Model predictions were compared statistically with data from pastures which were independent replicates of the pastures providing the data used to derive the transition matrices. Model predictions of plant cover dynamics were consistently within the 95% confidence limits based on field data.
    • Selectivity of Range Grass Seeds by Local Birds

      Goebel, C. J.; Berry, G. (Society for Range Management, 1976-09-01)
      A study was completed in depleted semiarid Pacific Northwest range to determine types of seeds preferred by local roosting birds. It was found that of the species tested, the two small-seeded species of Sherman big bluegrass and sheep fescue were removed more frequently than the larger-seeded wheatgrasses. The introduced annuals, cheatgrass and medusahead, were least removed of all species tested. Local birds can thus contribute to continued degradation of range communities by their seed diet preferences.
    • Range Improvement Following Chaining of South Texas Mixed Brush

      Scifres, C. J.; Mutz, J. L.; Durham, G. P. (Society for Range Management, 1976-09-01)
      Double chaining followed by raking and stacking heavy stands of south Texas mixed brush was more effective than double chaining alone or chaining one way, based on comparative degree of brush control, range forage production, and forage consumption by livestock. In a brush stand composed primarily of honey mesquite, spiny hackberry, and lime pricklyash, double chaining followed by raking and stacking reduced woody plant densities by 88%, increased oven-dry forage production by over 1,600 kg/ha, and increased forage consumption by 950 kg/ha as compared to untreated areas a year after treatment. Double chaining alone was less effective than double chaining, raking, and stacking in promoting forage production and consumption and did not improve management efficiency. Chaining one way was not considered an effective practice.
    • Plant Soil Microsite Relationships on a Salt Grass Meadow

      McGinnies, W. J.; Osborn, L. W.; Berg, W. A. (Society for Range Management, 1976-09-01)
      At least one million acres of potentially productive meadows in the central great plains are dominated by low value saltgrass. Soil chemical and physical factors have been measured to establish a microsite classification of vegetation-soil relations. The microsites are "slickspot," "level," "mound," and "swale." The mound microsite is dominated by alkali sacaton and produces the highest basal area ground cover. The slickspots were dominated by saltgrass, but average basal area was less than 10%. The level sites produced a mixture of saltgrass, blue grama, and alkali sacaton. The swales contained a mixture of saltgrass, western wheatgrass, and threadleaf sedge. The greatest hindrance to the conversion of these meadows to high quality pasture is that they are on a solonetz soil. The A horizon was a favorable habitat for plant growth; it was neither saline nor alkaline. The B horizon was a serious problem to plant growth because it is hard when dry and impermeable when wet. The C horizon is saline, but it remains moist or wet throughout the growing season.
    • Precipitation, Temperature, and the Standing Crop of Some Southern California Grassland Species

      Hufstader, R. W. (Society for Range Management, 1976-09-01)
      A strong relationship between precipitation (but not temperature) and standing crop is evident for the dominant species of a southern California grassland. The sub-dominant species showed no relationship to either precipitation or temperature. It was hypothesized that competition for light and variable germination times acts to limit the sub-dominant species. Differential success of sub-dominant species may account for much of the variability in California grasslands.
    • Orchardgrass Growth on Nitrogen and Sulfur Fertilized Volcanic Ash Soil

      Geist, J. M. (Society for Range Management, 1976-09-01)
      Growth responses of orchardgrass to additions of N and S from various sources were studied in the greenhouse on a volcanic ash soil. Sources with soluble S were superior to those with elemental S in producing faster growth, greater growth, and greater N recovery. Results indicate fertilizers with formulae of 21-0-0-24, 30-1-0-6, 27-12-0-4, or 16-20-0-15 should effectively aid rapid establishment of new orchardgrass seedings. Rapid early growth will take optimum advantage of stored soil moisture prior to the onset of dry summers which typically occur in much of the Northwest. Grazing at late growth stages will maximize returns from applied fertilizers.
    • Reducing Bias in Dry Leaf Weight Estimates of Big Sagebrush

      Harniss, R. O.; Murray, R. B. (Society for Range Management, 1976-09-01)
      The basic functional relation between foliage dry weight of big sagebrush plants and the independent variables, circumference and height of plant, was developed into a dry-weight prediction from prior knowledge and supporting information from a pertinent data set. Assuming the shape of the predictor's response surface is representative of similar plant populations elsewhere, scaler adjustment of the predictor to data from different locations, years, or subspecies would provide easy-to-use, unbiased estimators for these alternative applications. Also, the predictor can be used to improve consistency of the large-base estimates in double sampling with regression.