• An Evaluation of the Calibrated Weight-Estimate Method for Measuring Production in Annual Vegetation

      Tadmor, N. H.; Brieghet, A.; Noy-Meir, I.; Benjamin, R. W.; Eyal, E. (Society for Range Management, 1975-01-01)
      A double sampling technique, of visual weight estimates calibrated by harvesting, was applied to the measurement of biomass and production curves in grazed and ungrazed semiarid annual grassland. Good levels of accuracy can be achieved in such vegetation with a time expenditure significantly lower than by harvesting only. Some methodological problems were encountered and solved by modifications of the method. In some conditions the method can be used for estimating animal intake.
    • Germination of Range Plant Seeds at Altering Temperatures

      Ellern, S. J.; Tadmor, N. H. (Society for Range Management, 1967-03-01)
      The germination behavior at alternating temperatures of range plants suitable for seeding semi-arid range was consistent with their behaviour at the fixed temperatures of the alternation cycle, but not with weighted mean daily temperature. Unfavorable temperatures produced a greater retardation of germination than would be expected from their relative influence on the weighted mean. Alternating temperatures did not stimulate germination in the species studied. These data support conclusions from previous work regarding low seedbed temperatures as a factor in the failure of semi-arid range seeding operations.
    • Plant and Sheep Production on Semiarid Annual Grassland in Israel

      Tadmor, N. H.; Eyal, E.; Benjamin, R. W. (Society for Range Management, 1974-11-01)
      A stocking rate experiment with sheep was carried out over a 12-year period, 1962-1973, in a semidesert area with 250 mm rainfall. Four pasture types were investigated. Site and experimental conditions are described in this paper as well as grazing results on the unimproved native grassland. This is a herbaceous sward composed entirely of annuals. It yielded between 2 and 4 ton/ha dry matter per year in accordance with rainfall fluctuations. These yields are high in comparison with records from other parts of the world. It was shown that this area could give unsupplemented year round support to Mutton Merino sheep at stocking rates of 0.6-1.0 hectare per sheep per year. Annual lamb production ranged between 20-30 kg per ewe and between 30-60 kg per hectare. This is the first report of lamb production in such a low rainfall area.
    • Seeding Annuals and Perennials in Natural Desert Range

      Tadmor, N. H.; Evenari, M.; Katznelson, J. (Society for Range Management, 1968-09-01)
      Seeding of pasture plants in a desert in a 78-mm rainfall year resulted in complete failure of all perennials to establish themselves. Annuals, on the other hand, in spite of stunted growth, completed their life cycle and produced seed. Water-spreading is a pre-requisite for successful establishment of perennial pasture plants under desert conditions.
    • Sheep Production on Seeded Legumes, Planted Shrubs, and Dryland Grain in a Semiarid Region of Israel

      Eyal, E.; Benjamin, R. W.; Tadmor, N. H. (Society for Range Management, 1975-03-01)
      During a period of 10 years in an area in which rainfall ranged between 170 and 413 mm, grain yields ranged between 0.8 and 3.6 tons per hectare. When grazing was combined with cropping, between 20 and 200 kg of lamb liveweight were produced per hectare at different stocking rates and in different years. Grazing the grain fields had left enough grain to be harvested only under stocking rates lower than 0.4 hectare per ewe in most years, and under stocking rates lighter than 0.2 ha/ewe only in a year in which ungrazed fields produced 3.5 tons of grain per hectare. Of several legume species tried in the same area, Medicago polymorpha and M. tribuloides (= M. truncatula) survived to form dense swards of 3-6 t/ha dry matter yields. After 5 years, legumes were largely replaced by ruderal annuals. This grass sward forms a highly palatable pasture with yields equaling those of the legumes, probably due to the high nitrogen build-up in the soil. At stocking rates of 0.4-0.6 ha/ewe, sheep could be maintained on this pasture without supplements the whole year round. Annual lamb yields ranged from 15 to 40 kg/ewe and from 40 to 80 kg/ha. Fertility disorders, apparently due to estrogenic activity in the medics, were recorded in one of the high legume years. Native saltbush (Atriplex halimus) was planted at a rate of 1600 shrubs/ha as a range improvement technique. Shrub development was excellent and the shrubs soon formed a dense, impenetrable stand, crowding out most of the annual herbaceous grass and vegetation. Sheep performance on this vegetation was poor in comparison with unimproved native pasture.