• Effect of Weed Control on Forage Production in the Nebraska sandhills

      Morrow, L. A.; McCarty, M. K. (Society for Range Management, 1976-03-01)
      Plots for the control of broadleaf weeds and for the determination of forage loss due to broadleaf weeds were established in the Nebraska sandhills. Herbicides were applied in the first year, the first and second years, the first, second and third years, and the first and third years in a four-year study. Forty lb/acre of N (40-N) were applied the fourth year. Herbicide treatments included 2,4-D amine, 2,4-D ester, 2,4,5-T, and silvex at 1 and 3 lb/acre; dicamba at 1/8 or 1/4 lb/acre in combination with 2 or 1 lb/acre 2,4-D amine, respectively; and picloram at 1/16 or 1/8 lb/acre in combination with 2 or 1 lb/acre 2,4-D amine, respectively. Control of broadleaf weeds with herbicide increased forage production up to 330 lb/acre when used without N. N applied following applications of dicamba at 1/4 lb/acre combined with 1 lb/acre 2,4-D amine increased forage production up to 660 lb/acre. Total herbage production increased when N was applied, but broadleaf weed production increased when weeds were not controlled. Herbicides and fertilizer can be effectively utilized to increase forage production, but they will not correct the mismanagement that results in weedy grazing lands.
    • Effects of Water Stress and Temperature on Germination of True Mountainmahogany

      Piatt, J. R. (Society for Range Management, 1976-03-01)
      The effects of five levels of available water and four constant temperature regimes upon the germination of two ecotypic collections of true mountainmahogany (Cercocarpus montanus Raf.) were investigated. Results indicate that moisture stress significantly decreases both the rate and final amount of germination in this species. The amount of moisture stress required to cause these decreases was found to be dependent upon both the seed source and the temperature. Temperature was found to be more important in determining the rate than the amount of germination.
    • Seasonal Response of Macartney Rose and Huisache to Herbicides

      Meyer, R. E.; Bovey, R. W.; Riley, T. E.; Flynt, T. O. (Society for Range Management, 1976-03-01)
      Picloram granules and sprays were applied to Macartney rose (Rosa bracteata Wendl.) and huisache (Acacia farnesiana (L.) Willd.) in the claypan area of Texas. Monthly granule applications to Macartney rose were generally least effective in the summer. Rates of 1, 2, and 3 lb/acre of picloram as granules reduced the canopy 53, 68, and 86% and killed 14, 32, and 57% of the plants, respectively. Foliar sprays of picloram were about equally effective as granules. Huisache was not as highly responsive to picloram as to either granules or soil sprays at rates up to 4 lb/acre. However, picloram at 2 lb/acre as a foliage spray in May or September killed 90% or more of the plants. A 1 lb/acre foliage spray of picloram combined with a 1 lb/acre spray of 2,4,5-T, dicamba, or picloram in the soil also killed 53% or more of the huisache plants.
    • Influence of Temperatures, Water Stress, and Nitrogen Treatments on Chlorophyll and Dry Matter of Western Wheatgrass

      Bokhari, U. G. (Society for Range Management, 1976-03-01)
      Western wheatgrass (Agropyron smithii Rydb.) raised from seeds was given four treatments under three temperature regimes in environment controlled growth chambers. Dry matter and chlorophyll (a + b) were determined in the shoots of these plants at 20-day intervals for 100 days. Dry matter and chlorophyll production was greater from irrigated and irrigated-plus-fertilized plants under each temperature regime than it was from control or fertilized plants. This response was more pronounced at the intermediate temperature regime (24/13 degrees C) than that at the lower (13/7 degrees C) or the higher temperature regimes (30/18 degrees C). The maximum chlorophyll increase of irrigated and irrigated-plus-fertilized plants was 350% and 395% at 24/13 degrees C while in the control and fertilized plants the increase was 251% and 176%, respectively. A positive linear relationship was found between dry matter and chlorophyll of all the plants under the three temperature regimes.
    • Herbicide Nomenclature and Related Terminology

      Scifres, C. J. (Society for Range Management, 1976-03-01)