• A Point Frame for Circular Plots in Southern Forest-Ranges for Plant Cover Estimates

      Baker, R. L.; Thomas, C. E. (Society for Range Management, 1983-01-01)
      A point frame has been modified to allow for plant cover estimates to a 152 cm height. Construction of a third crossmember that can be added to a 76-cm tall point frame allows sampling pins to be projected both upward and downward. Spacings between pins were changed to produce equal sampling areas while sampling circular plots. This design was tested with a miniature point frame on artificial plant populations and was shown to measure within +/- 5% of actual cover values.
    • Effect of Atrazine, Fertilizer, and 2,4-D on Winter Grazing Preferences of Beef Cows on Northcentral Oklahoma Tallgrass Prairie

      Baker, R. L.; Powell, J. (Society for Range Management, 1982-07-01)
      A good condition, tallgrass prairie experimental area was treated with selected combinations of atrazine, 2,4-D, and NPK fertilizer in spring 1975 and 1976. Crude protein contents in November herbage ranged from 3.4% to 6.3% in treated samples. Untreated herbage contained 5.0% crude protein. Nonlactating beef cows were allowed to graze freely on the area during December, 1976. Utilization of herbage ranged from 43% to 87%. Utilization was greatest on NPK areas (82%), 3.4 kg atrazine + NP areas (85%), and 3.4 kg atrazine + NPK areas (87%). Decreaser species comprised a larger percentage of the total production on atrazine + NP, atrazine + NPK, and 2,4-D + NPK areas than on fertilizer-only areas. Tallgrass prairie treated with atrazine and fertilizer or 2,4-D and fertilizer was preferred by beef cows as winter forage over untreated herbage. There was a 15% increase in herbage utilization for every 1% increase in crude protein in the herbage in December.
    • Effects of Atrazine, 2,4-D and Fertilizer on Crude Protein Content of Oklahoma Tallgrass Prairie

      Baker, R. L.; Powell, J.; Morrison, R. D.; Stritzke, J. F. (Society for Range Management, 1980-11-01)
      Various combinations of atrazine, 2,4-D, and NPK fertilizer were applied initially in 1975 on a tallgrass prairie in good condition and again as a retreatment in 1976 on one-half of each treated area. Application of atrazine with fertilizer increased crude protein content, crude protein yield, and range condition during the summer. Differences in protein levels in dormant forage were not evident. Therefore the application of atrazine and fertilizer appears to be more feasible for summer grazing or production of high quality prairie hay than for yearlong or winter grazing.
    • Plot Delineation with a Pin-and-Chain

      Baker, R. L.; Pearson, H. A. (Society for Range Management, 1981-07-01)
      The pin-and-chain is currently being used to delineate sampling plot boundaries in Southern forest-range where conventional rigid plots would be impractical. The pin-and-chain method can be used for delineating both circular and rectangular plots.