Now showing items 21-25 of 25

    • Germination Responses of Three Desert Grasses to Moisture Stress and Light

      Tapia, C. R.; Schmutz, E. M. (Society for Range Management, 1971-07-01)
      Lehmann lovegrass appeared very susceptible to physiological drought while Arizona cottontop and plains bristlegrass were not appreciably affected until osmotic tensions exceeded 12 atm. Lehmann lovegrass was the fastest and plains bristlegrass was the slowest to germinate. This study indicated that the adaptability and responsiveness of Lehmann lovegrass is due to its ability to germinate rapidly whereas the other two species require more time of moisture availability. Lehmann lovegrass and Arizona cottontop appeared adversely affected by constant darkness which suggests that they require a shallow planting while plains bristlegrass seemed to have the opposite response, which suggests that it requires a deeper planting.
    • Costs and Returns in a Study of Common Property Range Improvements

      Simpson, J. R. (Society for Range Management, 1971-07-01)
      The clearing and reseeding of mesquite-covered alluvial flood plains on the Papago reservation in the southwestern United States to blue panic-grass was determined to be economically feasible. This improved range must, however, be used at full carrying capacity and livestock numbers restricted so the increased forage will be reflected as an increase in calves sold. A benefit-cost analyses was performed to determine what effect different methods of management would have on returns for a common property resource./El estudio fué llevado a cabo en la reservación de los indios Papagos en el Estado de Arizona, E.U.A. En el pastoreo comunal en esta reservación ha habido un sobrepastoreo que ha causado que los pastizales se encuentren en malas condiciones y de que haya baja producción de ganado y carne. Debido a que es difícil corregir el sobrepastoreo por razones sociales, los técnicos pensaron que sería mejor aumentar el coeficiente de agostadero utilizando ciertas prácticas tales como control de arbustos, siembras, bandas de dispersión de escurrimiento y construción de facilidades tales como aguajes, corrales y potreros. Sin embargo, había dudas si este método era económico o no. Se encontró que los métodos de mejorar el coeficiente de agostadero resultaban económicos solo con una carga animal adecuada. El sobrepastoreo aún en los pastizales mejorados no era económico y no cubrió los costos del mejoramiento.
    • Cattle Dips Are Used as a Tool for Range Management in Masailand, Tanzania

      Van Voorthuizen, E. G. (Society for Range Management, 1971-07-01)
      In many areas of east Africa cattle dips are needed to combat tickborne diseases. Currently the dips are installed near permanent water supplies and easy access roads, which leads to concentrations of livestock and overgrazing. However, with better management planning dips may be used as a tool to open new grazing areas and to increase the carrying capacity of the region. This article refers to the existing Tanzanian government programs for the pastoral peoples located mainly in the Masai district of northern Tanzania.
    • Bow and Arrow Brush Transects

      Walker, Larry L. (Society for Range Management, 1971-07-01)
      Bow-fishing equipment makes it posible for one man to rapidly establish and record line intercept brush transects.
    • A Rapid Method for Washing Roots

      Lauenroth, W. K.; Whitman, W. C. (Society for Range Management, 1971-07-01)
      The use of a system consisting of two sieves and a pail with a spout on it greatly facilitates washing soil material from roots. Washing into the first sieve can be continued until all visible soil material is removed. The capacity of the system was 150 to 180 samples per eight hour day. The major soil type on the sampling area was a Flasher loamy fine sand.