Articles by Keyword: Carbon 14

Search results for Carbon 14

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  1. Influence of Soil Organic Matter Content on the Responsiveness of <em>Eucalyptus grandis</em> to Nitrogen Fertiliser

    Item type: Journal Article • Journal: South African Forestry Journal
    It is widely recognised that the inherent nitrogen (N) mineralisation capacity of a soil is directly related to the organic matter content. Consequently, in estimating the N requirements of Eucalyptus grandis at planting this mineralisation potential must be taken into...
  2. Partitioning, storage and remobilization of <sup>14</sup>C assimilated by <em>Themeda triandra</em> Forssk<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The second youngest fully‐expanded leaf on the main tiller of vegetative Themeda triandra plants was exposed to 14CO2. Thereafter, quantitative analysis of partitioning, storage and remobilization after defoliation of 14C‐labclled assimilate was conducted in serially‐harvested plants over a 27‐day period...
  3. The effect of reduced tillage on soil organic carbon

    The effect of reduced tillage on soil organic carbon

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The organic carbon contents of the 0–15-cm and 15–30-cm layers of conventionally tilled, stubble-mulched and no-tilled soils were compared. Samples from four localities in the Transvaal and Orange Free State were analyzed for organic C by means of two methods...
  4. Changes in a Doveton clay loam after 12 years of direct-drill maize production

    Changes in a Doveton clay loam after 12 years of direct-drill maize production

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    After 8 years of direct-drill maize production at Cedara on a Hutton/Doveton clay loam (Typic Plinthustult) it was found that the top 120-mm layer had become somewhat denser and that organic carbon levels in the top 20 mm were higher...
  5. The effect of leaf water potential on the carbon-dioxide uptake rate during different growth stages of wheat (<em>Triticum aestivum</em> L.)

    The effect of leaf water potential on the carbon-dioxide uptake rate during different growth stages of wheat (<em>Triticum aestivum</em> L.)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of water stress on the CO2 uptake rate was measured at three different growth stages of wheat grown in Mitscherlich pots in a glasshouse experiment. Stress was induced by withholding water until the leaf water potential reached −2...
  6. Die verwantskap tussen maksimum nitrifikasietempo en relevante eienskappe van gronde vanaf die sentrale besproeiingsgebiede in Suid-Afrika

    Die verwantskap tussen maksimum nitrifikasietempo en relevante eienskappe van gronde vanaf die sentrale besproeiingsgebiede in Suid-Afrika

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die oogmerk van die studie was om die verwantskappe tussen maksimum nitrifikasietempo (Kmaks) en relevante eienskappe van die gronde vanaf die sentrale besproeiingsgebiede uit te wys. Die verloop van nitrifikasie is in agt gronde, afkomstig van die gebiede, gemonitor na...
  7. Urease-aktiwiteite in gronde van die sentrale besproeiingsgebiede in Suid-Afrika

    Urease-aktiwiteite in gronde van die sentrale besproeiingsgebiede in Suid-Afrika

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die oogmerk met die studie was om die omvang van urease-aktiwiteite in die besproeide gronde vas te stel en watter grondparameters dit beïnvloed. Die verloop van hidrolise is in agt gronde, afkomstig van die sentrale besproeiingsgebiede, gemonitor na toediening van...
  8. Verwantskap tussen organiese materiaalinhoud van sekere onversteurde bogronde, grondeienskappe en klimaatsdata in Suid-Afrika

    Verwantskap tussen organiese materiaalinhoud van sekere onversteurde bogronde, grondeienskappe en klimaatsdata in Suid-Afrika

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die doel met die ondersoek was om vas te stel of die organiese materiaalinhoud van onversteurde ortiese A-horisonte, wat deur rooi apedale, geelbruin apedale en sagte plintiese B-horisonte onderlê word, vanaf beskikbare of maklik meetbare grondeienskappe en klimaatsdata bereken kan...
  9. Nitrogen mineralization in selected soils from the maize producing areas of South Africa

    Nitrogen mineralization in selected soils from the maize producing areas of South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The aim of this study was to relate nitrogen mineralization from soil to selected soil properties more easily obtained in the laboratory. Net nitrogen mineralization was determined to varying depths (0–200, 200–400 and 400–600 mm) in 21 soil profiles from...
  10. Effek van bewerking op die organiese materiaalinhoud van geselekteerde droëlandgronde in Suid-Afrika

    Effek van bewerking op die organiese materiaalinhoud van geselekteerde droëlandgronde in Suid-Afrika

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die doel van die ondersoek was om (1) die effek van bewerking op die organiese materiaalinhoud van gronde te kwantifiseer indien onversteurde gronde as verwysing dien; (2) die verband tussen bewerkingstyd en die afname in organiese materiaal te kry en...