Articles by Author: L Steenkamp An0039

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  1. Kaliumvaslegging in 'n Arcadia-grond: I. Vaslegging onder natuurlike toestande

    Kaliumvaslegging in 'n Arcadia-grond: I. Vaslegging onder natuurlike toestande

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Ten einde die mate van kaliumvaslegging op 'n grand van die Arcadia-serie onder natuurlike toestande na te gaan, is grondmonsters van 'n reeks proefpersele geneem. Die persele het verskillende hoeveelhede kaliumbemesting oor 'n periode van 12 jaar ontvang. Die monsters...
  2. Die invloed van kalsium en magnesium op die groei van tabakplante en opname van kalium, kalsium en magnesium in waterkultuur

    Die invloed van kalsium en magnesium op die groei van tabakplante en opname van kalium, kalsium en magnesium in waterkultuur

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    'n Toename in the Ca-konsentrasie van 'n voedingsoplossing het 'n verhoging in biomassa tot gevolg gehad asook 'n verhoogde opname van K en Ca deur tabakplante. Die opname van Mg aan die anderkant word onderdruk deur toenemende konsentrasies van Ca...
  3. Kaliumvaslegging in 'n Arcadia-grond II. Vaslegging in die kleifraksie

    Kaliumvaslegging in 'n Arcadia-grond II. Vaslegging in die kleifraksie

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Ondersoek is ingestel na die invloed van relatief lae toedienings van kalium, asook drogingstemperatuur, op die vermoë van die kleifraksie van 'n Arcadia-grond, versadig met kalsium of magnesium, om kalium vas te lê. Die verskil in reaksie tussen die behandelings...
  4. The effect of nitrogen and manganese on the aroma of flue-cured tobacco

    The effect of nitrogen and manganese on the aroma of flue-cured tobacco

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Several volatile compounds are produced on curing fully aromatic tobacco leaves. In contrast, no volatiles are produced by ‘putty’ leaves. A clear correlation exists between the production of flavour compounds and the retention of structural integrity in the leaves after...
  5. A non-destructive sampling method for dendrochronology in hardwood species

    A non-destructive sampling method for dendrochronology in hardwood species

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Core sampling in indigenous hardwood species is not a common practise. A field method LOUS developed to obtain a large enough sample without permanently damaging the trees. A Milwaukee Dymo 2,3 k W electric drill fitted with a 2-speed gearbox...
  6. The pitch canker fungus, <em>Fusarium circinatum</em>: implications for South African forestry

    The pitch canker fungus, <em>Fusarium circinatum</em>: implications for South African forestry

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Fusarium circinatum, the causal agent of pitch canker of mature pines and root/collar rot of pine seedlings/cuttings, has resulted in large-scale losses to pine forestry in various parts of the world. The disease caused by this fungus is now regarded...
  7. Tolerance of <em>Pinus patula</em> full-sib families to <em>Fusarium circinatum</em> in a greenhouse study

    Tolerance of <em>Pinus patula</em> full-sib families to <em>Fusarium circinatum</em> in a greenhouse study

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The pitch canker fungus, Fusarium circinatum, has caused large-scale mortality of young Pinus patula Schiede and Deppe ex Schltdl. and Cham. seedlings in nurseries in South Africa since 1990. Diseased seedlings have been inadvertently carried to the field, which in...
  8. Future outlook for <em>Pinus patula</em> in South Africa in the presence of the pitch canker fungus (<em>Fusarium circinatum</em>)

    Future outlook for <em>Pinus patula</em> in South Africa in the presence of the pitch canker fungus (<em>Fusarium circinatum</em>)

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Approximately 50% of the area planted to softwood trees in South Africa has been established with Pinus patula, making it the most important pine species in the country. More effort has gone into developing this species for improved growth, tree...