Articles by Keyword: Growth Rate

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  1. Role of Eucalypt Plantations in Timber Supply and Forest Conservation in Sub-Saharan Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    The role of eucalypt plantations in timber supply and forest conservation in Sub-Saharan Africa was investigated. The annual destruction of 11,5 million ha of tropical forest is highlighted, the various causes indicated and the controversy whether fast-growing plantations and woodlots...
  2. The Blackwood Group System: its relevance for sustainable forest management in the southern Cape

    Item type: Journal Article • Journal: South African Forestry Journal
    The invasion status of Australian blackwood, Acacia melanoxylon, is assessed against its value as a commercial tree in the southern Cape forests. The species was introduced from Australian rain forests and planted extensively in the southern Cape forests since 1909...
  3. Produksie en kwaliteit van ‘n aantal grasspesies in die <em>Combretum‐</em>veld van noord‐transvaal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die produksie en kwaliteit van vyf spesies (Themeda triandra, Heteropogon contortus, Digitaria eriantha var. pentzii, Schmidtia pappophoroides en Eragrostis rigidior) is by verskillende frekwensies van ontblaring op ontbosde en onontbosde bosveld gemeet. In die daaropvolgende jaar is intensiteit bygebring met...
  4. Growth analysis of <em>themeda triandra</em> and <em>sporobolus fimbriatus</em> tillers in semi‐arid grassveld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Marked populations of Themeda triandra and Sporobolus fimbriatus tillers were sequentially harvested at fortnightly intervals both under irrigation and under unamended moisture conditions. Sampling covered a period from tiller initiation through to senescence after flowering.
  5. The influence of tiller age and time of year on the growth of <em>Themeda tri andra</em> and <em>Sporobolus fimbriatus</em> in semi‐arid grassveld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Sequential growth measurements were made on successive populations of Themeda triandra and Sporobolus fimbriatus tillers initiated at different times of the year. The independent influences of tiller age and time of year on tiller growth were isolated by deriving growth...
  6. Enkele faktore wat die vruggroei van sitrus beïnvloed

    Enkele faktore wat die vruggroei van sitrus beïnvloed

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    'n Ondersoek het aangetoon dat 'n hoogsbetekenisvolle (r = 0,96) verwantskap bestaan tussen waterverbruik van 'n volwasse sitrusboom en vruggroeitempo. Waterverbruik bereik 'n maksimum van 80–90 l/dag gedurende die periode Desember tot einde Maart, dit is dieselfde tyd wanneer vruggrootte...
  7. Initial seedling growth rates in a semi-dwarf spring wheat collection

    Initial seedling growth rates in a semi-dwarf spring wheat collection

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A relationship was observed between seedling growth rate and seedling emergence under conditions of soil capping. Coleoptile and root growth rates were strongly influenced by the origin of the seed sample and the genotype involved, whereas genotype × environment interactions...
  8. Effect of water stress on cane growth and water use of sugar cane

    Effect of water stress on cane growth and water use of sugar cane

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The growth and water use of three sugar cane cultivars, NCo376, N12 and N14, were measured under varying degrees of water stress controlled by means of a movable rain shelter. Plots of a first ratoon cane crop were allowed to...
  9. The inheritance of base temperature in grain sorghum

    The inheritance of base temperature in grain sorghum

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Two different methods were used to identify the genetic determinants of the base temperatures of sorghum seeds which were germinated at 15°C. These were a factorial mating design and a crossing system to identify lines which contain the greatest number...
  10. Bepaling van donkerrespirasie by mielies (<em>Zea mays L.</em>)

    Bepaling van donkerrespirasie by mielies (<em>Zea mays L.</em>)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Twee mieliecultivars wat in potte onder glashuistoestande met optimale watervoorsiening gekweek is, is gedurende die agtblaarstadium en stuifmeelstort tot baardverskyning aan stremming onderwerp deur watertoediening te weerhou. Die CO2-uitvloeitempo is op sekere tye gedurende die nagperiode gemonitor. Hierdie waardes het...