Articles by Author: Pj Van Den Brink

Search results for Pj Van Den Brink

We found 51 results for you
  1. Slope Classification and Mapping of the Forestry Area in the R.S.A.

    Item type: Journal Article • Journal: South African Forestry Journal
    The slope classification and mapping of South African forestry areas was undertaken with the specific objective of minimising terrain/machine mismatches which lead to the deterioration of productivity in the long term. The total forest area, including the indigenous forests, was...
  2. Harvesting and Transport Planning—a Holistic Approach

    Item type: Journal Article • Journal: South African Forestry Journal
    This publication presents an overview on the various levels of planning required for the harvesting and transport activities in South Africa, The planning levels are strategic planning, tactical planning, the annual plan of operations and operational or compartment planning. Although...
  3. A comparison of culture methods for tobacco (<em>Nicotiana tabacum</em>) anthers

    A comparison of culture methods for tobacco (<em>Nicotiana tabacum</em>) anthers

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Three different anther culture methods for the South African tobacco cultivars C11 × WOSB and CDL 28 were tested. The yield of haploid plantlets produced using a solidified or double-layer medium was significantly higher than with the use of a...
  4. Evaluation of petiole nitrate measurement as an aid for N fertilization of potatoes (<em>Solanum tuberosum</em> L.) on sandy soils

    Evaluation of petiole nitrate measurement as an aid for N fertilization of potatoes (<em>Solanum tuberosum</em> L.) on sandy soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Potatoes are produced in the Sandveld of the Western Cape on soils with extremely low clay and organic material contents. A low nitrogen mineralisation potential and high leaching hazard complicate the management of the nitrogen supply to the plant. This...
  5. A field method to determine three dimensional infiltrability of vineyard soils

    A field method to determine three dimensional infiltrability of vineyard soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A method is described to measure water intake from a small, shallow pond in which a 5 mm constant water head is maintained. Since water is supplied to the soil at near atmospheric pressure, infiltrability rather than infiltration rate is...
  6. SECOND-ORDER BOOLEAN ALGEBRAS

    SECOND-ORDER BOOLEAN ALGEBRAS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Opgedra aan Prof. Hennie Schutte by geleentheid van sy sestigste verjaarsdag.
  7. POWER STRUCTURES AND LOGIC

    POWER STRUCTURES AND LOGIC

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    This paper generalizes the concept of a power alge bra to that of a power structure, and gives three application of power structures to logic.
  8. Upwelling fronts: implications and unknowns

    Upwelling fronts: implications and unknowns

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Existing observations of coastal upwelling fronts and of upwelling filaments are reviewed. Attention is given to isolating those aspects where dynamic understanding and knowledge of physical-biological coupling are weak. Theoretical results are then reviewed with the goal of providing some...
  9. Cold-water filaments in the California Current system

    Cold-water filaments in the California Current system

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Prior to the mid 1980s, little was understood about the dynamics of cold filaments and their relation to coastal upwelling. However, during the late 1980s, the Coastal Transition Zone Programme studied these features in detail off California, leading to more...