Articles by Author: P J K Zacharias

Search results for P J K Zacharias

We found 17 results for you
  1. Book review

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Grasses of southern Africa, 1990 Gibbs Russell G.E., Watson L., Koekemoer M., Smook L., Barker N.P., Anderson H.M. and Dallwitz M.J., Memoirs of the Botanical Survey of South Africa No. 58. National Botanic Gardens/Botanical Research Institute, Pretoria, 437 pp. ISBN...
  2. The use of the cellulase digestion procedure for indexing the dry matter digestibility of forages

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The in vitro cellulase technique was compared with the rumen liquor technique and found to be more efficient for the indexing of the dry matter disappearance (DMD) of forages. A cellulase enzyme concentration of 80 IU/gDM gave a satisfactory linear...
  3. The effect of fire on germination in five common veld grasses

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The effect of fire on the germination of Themeda triandra, Heteropogon contortus, Panicum maximum, Aristida junciformis and Spowbolus africanus was investigated. Seeds exposed directly to the fire were destroyed in all species. The germination of seeds buried (7 to 9...
  4. Evaluation of three techniques for measuring grass leaf area<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Three leaf area measuring techniques were compared. Although statistical considerations received priority, practical issues such as economy of time, labour and finance, were also evaluated. The electronic light interception planimeter and the squared grid method (SGM) are already in common...
  5. <em>Leucaena leucocephala</em> as a quality supplement to <em>Pennisetum clandestinum</em> foggage: A preliminary study

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The performance of growing beef steers grazing foggaged dryland Pennisetum clandestinum (kikuyu) pastures and given limited access (3 h d−1) to Leucaena leucocephala cv. Cunningham (leucaena) was compared to that of steers grazing only kikuyu foggage during autumn and early...
  6. What does the new century offer range science in southern Africa?

    What does the new century offer range science in southern Africa?

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Range Science, as a developing discipline in southern Africa, is reviewed over its 60 years of formal existence. The context of the African political and socia-economic environment is used as a background to examine the impact that range science has...
  7. Rangeland assessment and monitoring: the elusive elixir

    Rangeland assessment and monitoring: the elusive elixir

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    'Classical' rangeland monitoring is discussed in the context of its fitness-for-purpose. The theoretical or descriptive models that underpin global approaches are considered and reviewed. The needs and types of measurements are discussed as are developments in southern Africa over three...
  8. Re-evaluation of the disc pasture meter calibration for the Kruger National Park, South Africa

    Re-evaluation of the disc pasture meter calibration for the Kruger National Park, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    During routine field application of the disc pasture meter (DPM) in the tall-grass rangeland of the Kruger National Park (KNP), it was noticed that the instrument frequently settles above the bulk of the grass leaf mass, leading to the suspicion...
  9. A contiguous-quadrat sampling exercise in a shrub-invaded grassland patch: size matters but biggest is not best

    A contiguous-quadrat sampling exercise in a shrub-invaded grassland patch: size matters but biggest is not best

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    We attempted to ascertain the most effective sample size for monitoring serial changes in the herbaceous layer of fragmented and neglected grasslands that are responding to annual veld burning. We conducted a sampling exercise in a coastal grassland invaded by...
  10. Utilization of woody browse and habitat by the black rhino (<em>Diceros bicornis)</em> in western Itala Game Reserve

    Utilization of woody browse and habitat by the black rhino (<em>Diceros bicornis)</em> in western Itala Game Reserve

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Black rhinoceros browse utilization was assessed at the woody plant species and community levels in western Itala Game Reserve, South Africa, using a semi‐quantitative, plant‐based method. Theis knowledge was used to hypothesize the possible effects of vegetation change on the...