• Effect of Fertilizer and Brush Control on Soil Fertility

      McMurphy, W. E.; Rommann, L. M.; Stiegler, J. H.; Stritzke, J. F. (Society for Range Management, 1980-11-01)
      Seven years after herbicide application was applied to reduce woody vegetation and increase native grass, there was no change in total available soil NO3- N, P, and K in the surface 15 cm. However, the area of native grass conversion had more soil K in the surface 5 cm and a higher pH in the surface 15 cm than the area supporting woody vegetation. Brush control followed by seeding of tall fescue (Festuca arundinacea) and annual fertilization with N, P, and K increased total available soil P and K in the surface 15 cm. Most of the P increase was in the surface 5 cm. Fertilizer applied to areas seeded to fescue appeared to reduce soil pH from that of native grass conversion.
    • 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.