Articles by Keyword: Intraspecific Variation

Search results for Intraspecific Variation

We found 98 results for you
  1. A morphological study on species of African <em>Mormyrus</em> (Teleostei: Mormyridae) and their electric organ discharges

    A morphological study on species of African <em>Mormyrus</em> (Teleostei: Mormyridae) and their electric organ discharges

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Five species of Mormyrus Linné 1758, three from West Africa and one each from East and southern Africa, were compared morphologically, and their electric organ discharges (EODs) recorded in the field. The five species were morphologically well differentiated in terms...
  2. Influence of mineral composition and rumen degradability of <em>Atriplex nummularia</em> (Hatfield Select F<sub>1</sub>) plants on selection preference of sheep

    Influence of mineral composition and rumen degradability of <em>Atriplex nummularia</em> (Hatfield Select F<sub>1</sub>) plants on selection preference of sheep

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    This study examined intraspecific variation in mineral composition and rumen degradability of Atriplex nummularia plants and the influence on selection preferences of sheep. Individual plants were categorised into high, medium and least preference groups by assessing the order in which...
  3. Micropropagation <em>of Eucalyptus radiata ssp. radiata</em> Using Explants from Mature and Coppice Material

    Item type: Journal Article • Journal: South African Forestry Journal
    Nodes from young field-grown coppice regrowth and branches of a mature tree of Eucalyptus radiata ssp. radiata were cultured on a MS medium containing BA and NAA. BA at 0,5 mg/ℓ and NAA at 0,01-0,1 mg/ℓ were most effective in...
  4. Variation in important pasture grasses: I. Morphological and geographical variation

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Seven species are important pasture grasses throughout the western Transvaal, Orange Free State, northern Cape and Natal. Taxonomically, each is a widely distributed species complex with a range of morphological variants and many ecotypes. The local forms well suited to...
  5. Variations in floristic and palatability composition, yield of veld and of soil characteristics on a paddock scale

    Variations in floristic and palatability composition, yield of veld and of soil characteristics on a paddock scale

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Five parallel 900-m line-transects were laid out 100 m apart in relatively homogeneous veld. Floristic composition, yields of dry matter, soil forms and series, effective depth, clay content of the top and subsoil, and the pH of the topsoil were...
  6. Genotypic variation in leaf water potential of field-grown soybeans (<em>Glycme max</em> L. Merr.) and its association with dryland yield

    Genotypic variation in leaf water potential of field-grown soybeans (<em>Glycme max</em> L. Merr.) and its association with dryland yield

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Maintenance of leaf water potential (ΨL) during periods of water stress may constitute an important drought-avoiding response. The identification of genotypic variation for this characteristic is, however, made difficult by the fact that comparative values for ΨL must be measured...
  7. Recognition of natural soil bodies using textural properties of red freely drained soil profiles from KwaZulu-Natal and Mpumalanga

    Recognition of natural soil bodies using textural properties of red freely drained soil profiles from KwaZulu-Natal and Mpumalanga

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The research examines the range of variation of soil texture for red freely drained soils associated with six of the major geological formations of KwaZulu-Natal and Mpumalanga. The soil profile information is derived from particle size analyses of over 4...
  8. The effects of spatial variation of certain soil properties on the winter yield of a lucerne stand

    The effects of spatial variation of certain soil properties on the winter yield of a lucerne stand

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In general, agricultural fields are managed as uniform units, ignoring spatial soil heterogeneity and its effects on growth and yield of field crops. This study was conducted from June 2001—February 2002 and examines the effects of spatial variation of soil...
  9. Regional sustainability in table grape production on saline soils

    Regional sustainability in table grape production on saline soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A study was done in South Africa to investigate the state of the soil salt content and its effect on plant growth on a regional rather than a point basis. The study site went through a development phase since 1996...
  10. Variation of agronomic traits of potato somaclones produced by meristem culture

    Variation of agronomic traits of potato somaclones produced by meristem culture

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Following a thermotherapy virus eradication procedure potato plantlets were multiplied as meristem clones in vitro. The agronomic traits of meristem clones were compared in field trials over three years. A total of 16 meristem clones of cultivar Agric dzeltenie and...