Articles by Author: Db South

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  1. Production Capacity of Softwood Sawmills in the Republic of South Africa, Swaziland and Transkei

    Item type: Journal Article • Journal: South African Forestry Journal
    The technical and practical capacities of softwood sawmills and boxmills in the Republics of South Africa, Transkei and Ciskei and the Kingdom of Swaziland were estimated as at 30 June 1987. These estimates show that sawmills in Southern Africa are...
  2. The Effects of Nitroacta (Urea formaldehyde) on the Survival and Growth of <em>Pinus elliottii</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    A pot trial testing the effect of no nitrogen, one level of urea and three levels of urea formaldehyde (Nitroacta) on the survival and growth of Pinus elliottii Engelm. is described. Survival, shoot increment, root/shoot ratio and mycorrhizal infection were...
  3. Fertilising Commercial Forest Species in Southern Africa: Research Progress and Problems (Part 1)

    Item type: Journal Article • Journal: South African Forestry Journal
    Since the inception of forest fertiliser research in Southern Africa in 1926, eight eucalypt, six pine and four acacia species have been tested, encompassing a wide range of sites in summer, winter and uniform rainfall areas. Marked deficiencies of P,...
  4. The History of the Clanwilliam Cedar (<em>Widdringtonia cederbergensis</em>): Evidence from Pollen Analysis

    Item type: Journal Article • Journal: South African Forestry Journal
    It has been argued that the current “endangered” status of the endemic Clanwilliam cedar is a consequence of exploitation of the tree and changes in the fire regime which took place within the last two hundred years or so. In...
  5. An Evaluation of the Use of “Gentan” Probabilities in Forestry Planning

    Item type: Journal Article • Journal: South African Forestry Journal
    An evaluation of Suzuki's concept of Gentan probabilities is presented. Model fitting is discussed in some detail. It is shown that the Gentan method is suitable only for forests that are at least close to normality.
  6. Site Relationships for Some Wood Properties of Pine Species in Plantation Forests of Southern Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    Although genetic variation in wood properties of the three main pine species planted in southern Africa is high, there are important site relationships.
  7. Identifying the Research Requirements for the Control of Silver Wattle (<em>Acacia dealbata</em>) in Natal

    Item type: Journal Article • Journal: South African Forestry Journal
    Silver wattle is being effectively controlled by some land-users using combinations of mechanical and chemical control methods together with fire. In rare cases infestations are being indirectly controlled by utilisation. Most control is limited to high potential land. However, little...
  8. Growth, Yield and Timber Density of Short Rotation Coppice Stands of <em>Eucalyptus grandis</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    The effects of timing initial coppice reductions, number of reductions and final number of shoots per stool on growth and yield of Eucalyptus grandis are described. The basic data were obtained from three experiments situated in different climatic zones of...
  9. 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...