Articles by Keyword: Grain Size

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  1. Opbrengskomponente van koring by verskillende vlakke van grondvrugbaarheid

    Opbrengskomponente van koring by verskillende vlakke van grondvrugbaarheid

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In 'n langtermyn bemestingsproef met koring onder besproeiing het groot verskille in grondvrugbaarheid oor jare ontwikkel, wat ook in groot verskille in graanopbrengs weerspieëf word. Opbrengs en opbrengskomponente was kleiner op persele wat geen P-bemesting ontvang as op persele wat...
  2. DISTINGUISHING SUB-ENVIRONMENTS OF SEDIMENT DEPOSITION IN RESERVOIRS USING PARTICLE SIZE DISTRIBUTION PARAMETERS

    DISTINGUISHING SUB-ENVIRONMENTS OF SEDIMENT DEPOSITION IN RESERVOIRS USING PARTICLE SIZE DISTRIBUTION PARAMETERS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The deposition of sediment and the distribution of sediment sizes in impoundments is related to the hydraulic mechanisms of the lacustrine or reservoir environment. Granulometric parameters of sediments can be particularly sensitive indicators of the hydraulic environments occuring in different...
  3. Vertical distribution of living mangrove foraminifera from KwaZulu-Natal, South Africa

    Vertical distribution of living mangrove foraminifera from KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Modern foraminiferal assemblage zones can be used to reconstruct palaeo sea levels when applied to fossil foraminifera down a sediment core. Previous intertidal foraminiferal studies have predominantly focused on assemblages in surface sediments (0–1 cm), with the rationale that surface...
  4. Floristic and Structural Composition of Wonderwoud Forest in the Wolkberg, North-Eastern Transvaal

    Item type: Journal Article • Journal: South African Forestry Journal
    The closed, evergreen forest of 450 ha was studied by means of a survey of 55 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into four stand types: Olea capensis macrocarpa—Xymalos monospora—Syzygium gerrardii...
  5. Floristic and Structural Composition of Hanglip Forest in the Soutpansberg, Northern Transvaal

    Item type: Journal Article • Journal: South African Forestry Journal
    The closed, evergreen forest of 363 ha was sampled by means of 62 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into regrowth forest with two forest types, and mature forest with four...
  6. An evaluation of the economic viability of commercial pastoralism in the <em>smaldeel</em> area of the Eastern Cape

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Carrying capacity models and financial data from study group farmers were used to derive attainable net revenue per ha on veld in good, moderate and poor condition. From these data, minimum farm sizes required for a reasonable standard of living...
  7. The relationship between sward structure, ingestive behaviour and dietary quality in cattle grazing a <em>Chloris gayana</em> pasture

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The relationship between sward structure, ingestive behaviour (bite size, biting rate and intake rate) and dietary crude protein (CP) content was studied on a Chloris gayana pasture at different growth stages using oesopha‐geally‐fistulated steers. As the pasture matured, leaf table...
  8. Influence of rainfall and grazing on the compositional change of the herbaceous layer of a sandveld savanna

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The influence of heavy grazing by cattle for three years, and of rainfall interception for one year, on the herbaceous composition of a sandveld savanna in Gazankulu was investigated. The composition and the abundance of the predominant species changed substantially,...
  9. Patterns of plant selection by grazing cattle in two savanna grasslands: A plant's eye view

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The amount of grazing experienced by individual tufts of the most abundant perennial grasses of two Transvaal savannas was monitored at regular intervals for two growing seasons. In general, Setaria incrassata and Themeda triandra were heavily grazed, Bothriochloa insculpla and...
  10. The origin of textural lamellae in Quaternary coast sands of Natal

    The origin of textural lamellae in Quaternary coast sands of Natal

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A new concept of the formation of textural subsoil lamellae has been developed on the basis of their morphology in aeolian coastal deposits in Natal. It has been concluded that they are initiated somewhere at depth in the profile by...