• Aspen Invasion in a Portion of the Alberta Parklands

      Bailey, A. W.; Wroe, R. A. (Society for Range Management, 1974-07-01)
      Brush areas on ranges in the parkland region of southcentral Alberta have increased from 4.8 to 8.0% of the land area between 1907 and 1966. The invasion was not constant each year, but was concentrated in two major periods between 1937 and 1970. Annual herbage production under aspen and willow was reduced by 80 to 90% when compared with the production of adjacent rough fescue grassland. The invasion of aspen into grasslands was correlated with high temperatures, particularly during the month of June, 1 and 2 years before tree establishment and with low precipitation 2 years prior to establishment.
    • A Double Sampling Technique for Estimating Dietary Composition

      Peden, D. G.; Hansen, R. M.; Rice, R. W.; Van Dyne G. M. (Society for Range Management, 1974-07-01)
      A double sampling technique is described which has a potential to increase sampling accuracy and efficiency when estimating botanical composition of herbivore diets. When applied to wild herbivores this technique may also reduce the need for using fistulated and thus behaviorally abnormal animals.
    • A Mobile Infiltrometer for Use on Rangeland

      Blackburn, W. H.; Meeuwig, R. O.; Skau, C. M. (Society for Range Management, 1974-07-01)
      The mobile drip type infiltrometer described in this note is easily constructed and simple to operate on rangelands accessible by truck.
    • A Simple Field Technique for Identification of Some Sagebrush Taxa

      Stevens, R.; McArthur, E. D. (Society for Range Management, 1974-07-01)
      A technique has been developed that provides an on-the-spot field test to aid in identification of some sagebrush taxa. Seeds, dried or green crushed leaf material, or stem cambium of various sagebrush taxa will produce distinctive shades of blue when wet and placed under longwave ultraviolet light. The technique is particularly helpful in separation of Artemisia tridentata subsp. tridentata from A. tridentata subsp. vaseyana. Subspecies vaseyana extracts are blue, whereas those of subsp. tridentata are not. All taxa producing blue water extracts are preferred by mule deer.
    • Canopy Structure of a Tall-grass Prairie

      Conant, S.; Risser, P. G. (Society for Range Management, 1974-07-01)
      Several characteristics of vegetation structure, including height, basal cover, cover repetition, leaf area, and distribution of aboveground biomass, were examined in grazed and ungrazed treatments of native Oklahoma tall-grass prairie. Selected structural parameters were evaluated to determine their value as reliable predictors of biomass dynamics. Cover repetition and leaf area showed good correlation with above-ground biomass. Studies of vegetation structure may provide an additional basis for understanding grazing response in grassland communities, and may serve as a basic tool for clarifying the roles of water, light and nutrients, and their effects on grassland production.
    • Future of Rangelands in Canada

      Whelan, E. F. (Society for Range Management, 1974-07-01)
    • Influence of Nitrogen and Irrigation on Carbohydrate Reserves of Buffalograss

      Pettit, R. D.; Fagan, R. E. (Society for Range Management, 1974-07-01)
      Five rates (0, 30, 60, 90, and 120 kg of N/ha) of nitrogen fertilizer were applied in April, 1971, to a deep hardland range site where buffalograss (Buchloe dactyloides Nutt.) predominated. The influence of these nitrogen applications on the carbohydrate reserve (TAC) concentration of irrigated and nonirrigated buffalograss roots and crowns was evaluated. In 1971 the TAC reserve concentration of the storage tissues varied inversely with rate of nitrogen application until the past ripe phenological stage. After this date, TAC's accumulated more rapidly in the heavier N treatments. In 1972, insignificantly more TAC were found in the control and 30 kg N/ha treatments at the hard seed stage. On all sampling dates buffalograss crowns contained more reserve carbohydrates than did the roots. Similarly, stolons contained 19% more TAC than did the crowns. Water applications reduced the carbohydrate reserves of this grass from 15 to 36%. Irrigation increased female spikelet yield by 44 kg/ha while stolon yield was similar regardless of water regime.
    • Relationship between Precipitation and Annual Rangeland Herb Age Production in Southeastern Kansas

      Shiflet, T. N.; Dietz, H. E. (Society for Range Management, 1974-07-01)
      Herbage production on the loamy upland range site in southeastern Kansas is related to seasonal precipitation. April through September precipitation gave the most reliable predictor of total herbage production. However, this value cannot be determined early enough in the season to make adjustments in livestock numbers on seasonally grazed ranges. May through July precipitation, though less precise than that for April through September, can also be used to predict herbage yields and is timely enough for seasonal adjustments in livestock. Big bluestem was the only major species that showed significant correlation with seasonal precipitation. May through July precipitation was the best predictor of the herbage produced by this species.
    • Relationships of Taste, Smell, Sight, and Touch to Forage Selection

      Krueger, W. C.; Laycock, W. A.; Price, D. A. (Society for Range Management, 1974-07-01)
      Chemical impairment of taste, smell, and touch and physical obstruction of sight were studied in relation to forage preferences of sheep in a tall-forb plant community. Taste was the special sense most influential in directing forage preference; the other senses appeared to supplement taste. Sheep preferred sour and sweet plants and generally rejected bitter plants, although some were palatable. Smell was of minor importance in selection. Touch and sight related to such specific plant conditions as succulence and growth form. Simultaneous impairment of all four senses did not result in completely random selection, but did increase preference for unpalatable plants and decrease preference for palatable ones.
    • Salt and Oxalic Acid Content of Leaves of the Saltbush Atriplex halimus in the Northern Negev

      Ellern, S. J.; Samish, Y. B.; Lachover, D. (Society for Range Management, 1974-07-01)
      Saltbush (Atriplex halimus L.) in the semiarid south of Israel was analyzed for leaf sodium, chlorine, and oxalic acid in order to identify and propagate low-salt bushes likely to be browsed more readily by range cattle and sheep. No correlation was found between leaf chlorine and growth habit factors like bush size and leafiness, or between chlorine and sodium. High-chlorine bushes had a lower Na/Cl ratio, and probably a substantial proportion of the Na+ and Cl- ions are not linked as NaCl. Leaf oxalic acid was lower in high-chlorine bushes. The data suggest that moisture streess sharply reduced insoluble leaf oxalate. Values found are unlikely to cause toxicity problems in livestock.
    • Future of Rangelands in the United States

      Long, R. W. (Society for Range Management, 1974-07-01)
    • Grazing Management Terminology

      Kothmann, M. M. (Society for Range Management, 1974-07-01)
    • Infiltration for Three Rangeland Soil-Vegetation Complexes

      Tromble, J. M.; Renard, K. G.; Thatcher, A. P. (Society for Range Management, 1974-07-01)
      A rotating disk rainfall simulator was used to examine infiltration-runoff relations from selected rangeland sites as influenced by a soil-vegetation complex. The simulator assisted in quantifying infiltration rates for different management practices on different soil types. Infiltration was greater for brush dominated plots than for either grazed plots or grass plots without grazing. Antecedent soil moisture decreased infiltration rates. Crown cover was approximately twice as much on brush plots as on grass plots and significantly influenced infiltration.
    • Tolerance of Bermudagrass to Herbicides

      Bovey, R. W.; Meyer, R. E.; Holt, E. C. (Society for Range Management, 1974-07-01)
      Herbicides 2,4-D, 2,4,5-T and dicamba applied in spring or fall usually did not reduce yields of bermudagrass. When applied during dry periods, picloram reduced density and yield of bermudagrass. Degree of bermudagrass injury was directly related to rate of herbicide. "Common," "Coastal," and "Coastcross-1" varieties responded similarly to each herbicide studied. Kleingrass, a new forage grass growing in the plot area, was tolerant of all herbicide treatments, including picloram.
    • Evaluation of the Atrazine-Fallow Technique for Weed Control and Seedling Establishment

      Eckert, R. E.; Asher, J. E.; Christensen, M. D.; Evans, R. A. (Society for Range Management, 1974-07-01)
      The atrazine-fallow technique was evaluated for 3 years on study areas of from 50 to 1,000 acres. Atrazine at 0.6 to 1.2 lb/acre was applied in the fall by ground rig, by fixed-wing aircraft, or by helicopter. Ground-rig application gave the most uniform control of cheatgrass and tumble mustard during the fallow year. Air application usually left weedy strips between swaths of excellent weed control. Wheatgrasses and other species of grasses and forbs were fall-seeded with the standard and deep-furrow rangeland drills 1 year after herbicide application. Fair to excellent seedling stands were obtained in all years. However, in 1 year a valid evaluation of treatment effects was not possible because of depradation and unusually high spring precipitation in the seedling year. In 2 years, environmental conditions were near normal, and depredation was reduced by use of large study areas and insect control. Under these conditions, good established stands of crested, intermediate, pubescent, and Siberian wheatgrasses were obtained by the chemical-fallow technique.
    • Carbohydrate and Organic Nitrogen Concentrations within Range Grass Parts at Maturity

      Perry, L. J.; Moser, L. E. (Society for Range Management, 1974-07-01)
      Total nonstructural carbohydrate (TNC) levels were significantly different among eight range grasses at maturity. Roots, rhizomes, and stem bases (storage organs), differed significantly in percentage TNC within rhizomatous and bunch-type (non-rhizomatous) grasses. Percent organic nitrogen differed significantly among grasses and storage organs but not to the same extent as occurred with TNC. We suggest that TNC concentrations of storage organs must be determined for each grass before sampling for TNC levels, in order to locate storage organs with greatest TNC concentration.
    • Clipping Height and Frequency Influence Growth Response of Nitrogen-Fertilized Blue Grama

      Bekele, E.; Pieper, R. D.; Dwyer, D. D. (Society for Range Management, 1974-07-01)
      A greenhouse study with two clipping heights (1- and 2-inch stubble heights) and two clipping frequencies (every 10 and 20 days) showed that blue grama was able to make use of nitrogen fertilizer much more efficiently when unclipped than when clipped. Both clipping heights and clipping intervals decreased shoot and root weights on fertilized plants compared to fertilized and unclipped plants. The effect of clipping on unfertilized plants was much less drastic than on fertilized plants.
    • Control of Gambel Oak with Three Herbicides

      Van Epps, G. A. (Society for Range Management, 1974-07-01)
      Fenuron, picloram, and 3 phenoxy compounds were applied to Gambel oak (Quercus gambellii Nutt.) to attain a complete kill of the plant. Spring treatments of fenuron applied to the soil at rates of 8 lb ae/acre or higher were effective as were fall applications. Picloram as a soil treatment was not effective. Foliar spraying with picloram and the phenoxy compounds at the higher rates killed oak crowns but not the plants. The herbicides varied in their injury to under-story vegetation.
    • Comparison of Vegetation Structure and Composition in Modified and Natural Chaparral

      Rosario, J. A.; Lathrop, E. W. (Society for Range Management, 1974-07-01)
      Six years following type conversion of a chaparral plot in southern California, density per acre and number of shrub species were reduced by 79.7% and 40%, respectively. Replanting following brush removal resulted in establishment of a perennial bunchgrass community with a basal area of 7% as compared to essentially no grass on the control plot.