Articles by Author: Gert J Van Den Berg

Search results for Gert J Van Den Berg

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  1. Effect of rainfall and under-canopy vegetation on the ability to debark <em>Eucalyptus grandis</em> x <em>E. camaldulensis</em> when felled in Zululand, South Africa

    Effect of rainfall and under-canopy vegetation on the ability to debark <em>Eucalyptus grandis</em> x <em>E. camaldulensis</em> when felled in Zululand, South Africa

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The combined effects of seasonal variation in rainfall and the presence or absence of under-canopy vegetation on soil moisture content may have a negative or positive impact on the ability to debark eucalypts. A study was initiated to investigate these...
  2. Estimates of genetic parameters and genetic gains for growth traits of two <em>Eucalyptus urophylla</em> populations in Zululand, South Africa

    Estimates of genetic parameters and genetic gains for growth traits of two <em>Eucalyptus urophylla</em> populations in Zululand, South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    In South Africa, Eucalyptus urophylla is an important species due to its disease tolerance to fungal diseases such as Crysoporthe austroafricana and the Coniothyrium sp. cankers. It is mainly planted as a parental species in a hybrid combination with E...
  3. Genetic parameters and genotype by environment interaction of <em>Eucalyptus grandis</em> populations used in intraspecific hybrid production in South Africa

    Genetic parameters and genotype by environment interaction of <em>Eucalyptus grandis</em> populations used in intraspecific hybrid production in South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    In South Africa, Eucalyptus grandis is an important species due to its fast growth and general suitability of its timber for a range of products. However, E. grandis is susceptible to fungal diseases such as Crysoporthe austroafricana and Coniothyrium sp...
  4. Response of <em>Eucalyptus</em> to Aldicarb in Coastal Sandy Soils in Natal, South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    The planting of Eucalyptus on aeolian; recent sands of the Natal coast has raised the question of whether nematicides are as necessary to counter patchy, unthrifty growth, as they are for sugarcane. The heights of eucalypts were mea sured at...
  5. Plant Nematodes in the Bergplaas Plantation, Western Cape Province with a Description of a New <em>Criconema</em> Species and Notes on Two Known Species of Criconematidae

    Item type: Journal Article • Journal: South African Forestry Journal
    During a survey of plant-parasitic nematodes in the Bergplaas Plantation, Western Cape Province, one Acacia melanoxylon compartment, seven Pinus compartments and twenty-two pockets of indigenous forest and virgin veld were sampled. Criconema, Rotylenchus and Scutellonema species were found at most...
  6. Die uitwerking van seisoenbeweiding op die bedekking en samestelling van <em>cymbopogon‐themeda</em> veld<sup>1</sup>

    Die uitwerking van seisoenbeweiding op die bedekking en samestelling van <em>cymbopogon‐themeda</em> veld<sup>1</sup>

    Die langtermyn uitwerking van beweiding gedurende vaste seisoene en kombinasies daarvan op sekere plantegroei‐eienskappe van Cymbopogon‐Themedaveld van die Sentrale O.V.S. is ondersoek. Twee veldproewe is uilgevoer wat onderskeidelik deur Merinoskape en Afrikanerbeeste bewei is. Elk van die proewe was ‘n...
  7. Die uitwerking van seisoensbeweiding op die infiltrasievermoë van gronde in ‘n <em>cymbopogon‐themedaweld</em>
               <sup>1</sup>

    Die uitwerking van seisoensbeweiding op die infiltrasievermoë van gronde in ‘n <em>cymbopogon‐themedaweld</em> <sup>1</sup>

    Die langtermyn uitwerking van beweiding gedurende vaste seisoene en kombinasies van seisoene, op die infiltrasievermoë van gronde in ‘n Cymhopogon‐Themedaveld in die Sentrale O.V.S., is ondersoek. Twee veldproewe wat onderskeidelik deur Merinoskape en Afrikanerbeeste bewei is, is uitgevoer. Elk van...
  8. Hidrologiese siklus en waterverbruiksdoeltreffendheid van veld in verskillende suksessiestadia

    Hidrologiese siklus en waterverbruiksdoeltreffendheid van veld in verskillende suksessiestadia

    Nie‐drywende hidroliese lisimeters is gebruik om die evapotranspirasie (Et) verlies en waterverbruiksdoeltreffend‐heid (W.V.D.) van veld in verskillende suksessiestadia te bepaal vir die periode September 1978 tot Junie 1979. Die afloopverliese vanaf afloopbane waarin die verskillende suksessiestadia nageboots is, is ook...
  9. Die benutting van grasveld indie sentrale oranje‐vrystaat met skape

    Die benutting van grasveld indie sentrale oranje‐vrystaat met skape

    ‘n Studie van die benutting van suiwer klimaks grasveld in die Sentrale Oranje‐Vrystaat deur skape het getoon dat skape wel voorkeur aan sekere plantspesies bo ander gee. Hierdie seleksiepatroon verander nie baie van die somer na die winter nie, tensy...