Browsing Journal of Range Management, Volume 23, Number 4 (July 1970) by Title
Now showing items 17-20 of 20
Selenium Concentrations in Forage on Some High Northwestern RangesForages produced on some high northwestern ranges were analyzed for selenium concentration to determine the hazard of white muscle disease (WMD) in calves and lambs. The selenium concentration in 94 forage samples ranged from 0.01 to 0.78 ppm, of which 20 samples contained more than 0.10 ppm. The remaining 74 samples contained less than 0.10 ppm and 59 of those contained less than 0.05 ppm. Approximately 90% of the summer ranges studied produce forage containing less than 0.10 ppm selenium. Thus, the hazard of WMD on these northwestern ranges may be high. Ranchers should work individually and in groups to ascertain losses from the disease and minimize them by injecting the animals with selenium.
Soil Physical Conditions after Plowing and Packing of RidgesA system of seedbed preparation by moldboard plowing and packing small ridges appears to fulfill two requirements for successful seeding-control wind erosion and eliminate competing vegetation. The percentage by weight of soil aggregates larger than 0.833 mm increases greatly with an increase in the moisture content of soil at the time of packing. A sandy loam soil should contain 9 to 12% moisture when packed to obtain a surface condition greatly resistant to wind erosion.
The Role of Wet Meadows as Wildlife Habitat in the SouthwestThere are approximately 43,700 acres of wet meadows on National Forests in the Southwest. Three sites (meadow, transition, and dry forest) influence herbage production and plant composition. Average per acre production for a 3-year period was 2,690 lb, 1,330 lb, and 170 lb in the meadow, transition and surrounding dry forest sites, respectively, for two areas studied. Deer and elk spent more time in the adjacent forest edge than in the meadow, but time spent in the meadow may be more important for quantity and quality of forage.
Value of Broom Snakeweed as a Range Condition IndicatorFollowing an initial 13 year stabilization period, changes in broom snakeweed populations on southwestern pinyon-juniper ranges were investigated over a subsequent 13-year period. The changes which occurred appeared to be the result of oscillating populations rather than of range condition.