• Shade-induced Grass-Tetany-Prone Chemical Changes in Agropyron desertorum and Elymus cinereus

      Mayland, H. F.; Grunes, D. L. (Society for Range Management, 1974-05-01)
      Grass tetany, a magnesium (Mg) deficiency in grazing ruminants, often occurs simultaneously with periods of reduced solar radiation levels. The objective of this study was to determine if reduced radiation levels produce a chemical composition in grass indicative of a tetany-prone forage. Two grass species were exposed to three radiation levels (8, 25, and 100% of actual) by shading with burlap cloth. The vegetatively growing forage was harvested at weekly intervals over a 5-week period during early spring. Shaded forage had higher concentrations of Mg than did unshaded forage. However, shaded forage compared to forage grown in full sunlight would likely result in less Mg being available to the animal. The hypothesized inverse relationship between radiation and the incidence of grass tetany in Idaho, Nevada, and Utah is supported by field observations.
    • Species for Seeding Arid Rangeland in Southern Idaho

      Hull, A. C. (Society for Range Management, 1974-05-01)
      Ninety species were seeded in 2,450 range plots in 60 studies on depleted rangelands and on abandoned dry farmland in the sagebrush region in southern Idaho. Seedings range from 20 to 40 years old. Crested and fairway wheatgrasses were the most successful species on the drier sagebrush sites, and intermediate and pubescent wheatgrasses on the moister sites. Russian wildrye was good in southeastern Idaho, especially on saline lands. Western and Siberian wheatgrasses had some good stands but were not consistently successful. Good seedbed preparation and control of competing vegetation are necessary to get good stands of seeded species. Good seeded stands produced from 800 to 1,800 lb herbage per acre, as compared to 45 to 200 lb before seeding.
    • Viewpoint: Zootic Climax

      Houston, Douglas B.; Cole, Glen F. (Society for Range Management, 1974-05-01)
    • Yearlong Grazing of Slash Pine Ranges: Effects on Herbage and Browse

      Pearson, H. A.; Whitaker, L. B. (Society for Range Management, 1974-05-01)
      Total herbage yields under immature slash pine were not appreciably changed by yearlong cattle grazing which removed 30 to 60% of the annual growth. However, moderate (45%) and heavy (60%) grazing reduced pinehill bluestem frequency and increased carpetgrass. Individual browse species were not affected by grazing intensity, but total cover was reduced with moderate grazing. As tree density increased, the total herbage yields decreased.
    • Yield and Protein Content of Sandyland Range Forages as Affected by Three Nitrogen Fertilizers

      Pettit, R. D.; Deering, D. W. (Society for Range Management, 1974-05-01)
      A west Texas sandyland range site was fertilized with two rates, (30 and 60 kg/ha of actual N) of ammonium nitrate (AN), ammonium sulfate (AS) and ammonium phosphate-sulfate (APS) on June 2, 1972. Yield samples taken in mid-August showed all fertilizer treatments to significantly increase total yields. The 60 kg/ha of N treatments of AS and APS produced more herbage than all other fertilizer treatments. Climax decreasers on the site, little bluestem (Schizachyrium scoparium) and sideoats grama (Bouteloua curtipendula), showed less yield response to fertilization than increaser and invader grasses. Crude protein analysis of leaf tissue showed the grasses of the control (ON) to contain significantly less and the grasses treated with 60 kg/ha of N as AN to contain more protein than other treatments. Sulfur appears to be more important than phosphorus in increasing yields on this site. Also, range condition should be at least high fair before fertilizer is applied to minimize competition between the desirable and invader plants.