Articles by Author: Alastair M Campbell

Search results for Alastair M Campbell

We found 63 results for you
  1. The application of camera trapping to assess Rallidae species richness within palustrine wetland habitat in South Africa

    The application of camera trapping to assess Rallidae species richness within palustrine wetland habitat in South Africa

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Wetlands are vital habitats for a variety of organisms and ecosystem services, but the health of these valuable habitats is declining worldwide. The Rallidae species that rely on these habitats are typically elusive, cryptic and difficult to monitor accurately, especially...
  2. 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...
  3. Utilisation of Solasodine from Fruits for Long-term Control of <em>Solanum mauritianum</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    Present methods of controlling bugweed trees and of reducing the seed reservoir in the soil are discussed. A long-term method to limit the accumulation of new seed into the soil is proposed. This involves the utilisation of green fruits for...
  4. A complex dormancy mechanism in seeds of the weed <em>Rubus cuneifolius</em>

    A complex dormancy mechanism in seeds of the weed <em>Rubus cuneifolius</em>

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Both the endocarp and embryo contribute to the dormancy of Rubus cuneifolius seed. Whereas scarification was found to break the dormancy imposed by the endocarp, embryo dormancy could only be overcome by a combination of treatments. These treatments consisted of...
  5. Effect of moisture supply on CAM in <em>Opuntia aurantiaca</em> (jointed cactus)

    Effect of moisture supply on CAM in <em>Opuntia aurantiaca</em> (jointed cactus)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The patterns of gas exchange exhibited by Opuntia aurantiaca under controlled conditions (photoperiod 12 h; day/night temperature regime 30/15°C) were investigated for plants subjected to various levels of moisture stress. Unstressed plants exhibited a typical full-CAM pattern of gas exchange...
  6. Development of integrated control strategies for wattle. 1. Utilization of wattle, control of stumps and rehabilitation with pastures

    Development of integrated control strategies for wattle. 1. Utilization of wattle, control of stumps and rehabilitation with pastures

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Two integrated control strategies were developed for areas where wattle infestations could be utilized. Costing analyses were determined for initial control and four follow-up control operations using chemical control and fire. Efficacy of all treatments was high. Costs were significantly...
  7. Development of integrated control strategies for wattle. II. Control of unwanted wattle

    Development of integrated control strategies for wattle. II. Control of unwanted wattle

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four integrated control strategies were developed for wattle that could not be removed for utilization. In the first two strategies, a combination of mechanical and/or chemical control methods either reduced the wood biomass in situ (fell, stack and burn) or...
  8. Rate and timing of nitrogen fertilizer applications on wheat grown under dryland and supplementary irrigation

    Rate and timing of nitrogen fertilizer applications on wheat grown under dryland and supplementary irrigation

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Field experiments were carried out at the University of Sydney Farm, to examine nitrogen fertilizer application strategies for increasing N uptake and productivity of wheat (Triticum aestivum L.) grown on a red-brown earth (Natrixeralf) in Australia, under dryland and supplementary...
  9. Acidic iron oxide waste as a conditioner for calcareous soils

    Acidic iron oxide waste as a conditioner for calcareous soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A fine-grained iron oxide (hematite, (α-Fe2O3), containing 1.2% hydrochloric acid by mass, is the main by-product of an acid recovery plant at Saldanha Bay. The alkalinity of calcareous soils in this semi-arid region causes plant deficiencies in many trace elements,...
  10. CLIMGEN-UP: A user-friendly weather data generator

    CLIMGEN-UP: A user-friendly weather data generator

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    User-friendly Windows software, CLIMGEN-UP, was developed based on the CLIMGEN weather data generator. CLIMGEN-UP calculates and stores monthly statistical parameters, based on historic data of daily rainfall, minimum and maximum temperature. It can then generate and store long-series of daily...