Articles by Keyword: Air Traffic Control

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  1. Causes, adverse effects and control of soil compaction

    Causes, adverse effects and control of soil compaction

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The causes, adverse effects and control of soil compaction, with special reference to Southern African conditions, are reviewed. The main causes for soil compaction are the well-rounded and -sorted fine sand fraction of the aeolian sandy soils combined with compression...
  2. Exploring the Impact of Self-Directed Team Learning in an Air Traffic Control Environment

    Exploring the Impact of Self-Directed Team Learning in an Air Traffic Control Environment

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    Experienced military air traffic controllers (25 respondents, males = 15, females = 10, years of experience = less than one year = 5 respondents, more than one year but less than three years = 11 respondents and more than three...
  3. The Effect of Site Preparation and Tending on the Growth of <em>Pinus radiata</em> in the Southern Cape: Five Year Results

    Item type: Journal Article • Journal: South African Forestry Journal
    This paper details the latest results of site preparation and tending experiments in Pinus radiata on regenerated sites, on both Kruisfontein Plantation in the Southern Cape District of the Western Cape Forest Region and Blueliliesbush Plantation in the Tsitsikamma Forest...
  4. Die ekonomiese implikasies van bosverdigting en bosbeheer soos van toepassing op ‘n speenkalfproduksiestelsel in die doringbosveld van die Molopo‐gebied

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Daar bestaan ‘n dringende behoefte aan ekonomies geregverdigde kostes wat as riglyne kan dien vir bosbeheer in die Molopo‐gebied. In hierdie referaat word so ‘n bedrag beraam.
  5. Effects of four herbicides on the infestation of maize by the nematode <em>Pratylenchus zeae</em>

    Effects of four herbicides on the infestation of maize by the nematode <em>Pratylenchus zeae</em>

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effects of atrazine, alachlor, EPTC and 2, 4-D on penetration and reproduction rate of Pratylenchus zeae on maize, were evaluated. The herbicides had no significant influence on the nematode populations.
  6. The effect of tebuthiuron on the vegetation of the thorn Bushveld of the Northern Cape – a preliminary report

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Two formulations of tebuthiuron i.e. Graslan 20P and Graslan 40P are currently being evaluated in the Molopo area. Tebuthiuron was applied aerially at ten application rates, in combination with two application dates.
  7. Implikasies van subhabitat‐diversiteit en die rol van bestuur op die voorkoms van ‘n aantal grasspesies van die suuragtige‐gemengde bosveld<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die subhabitatvoorkeure van sewe grasspesies en die nie‐grasagtige kruide, tipies van die Suuragtige‐Gemengde Bosveld, is in agt kampe, wat verskillende langtermyn‐beweidingsbehandelings ontvang het, ondersoek. Twee subhabitatte is geidenti‐fiseer, nl. onder borne en tussen bome. Verskille in die subhabitatvoorkeure van die...
  8. Die beheer van <em>Amaranthus</em> spp. en die invloed daarvan op <em>Digitaria eriantha</em> gedurende die vestigingsjaar

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The control of Amaranthus spp. and the influence thereof on Digitaria eriantha during the season of establishment. Chemical control of Amaranthus spp. in newly established Smuts finger grass (D. eriantha) was investigated. A mixture of 800 ml 2,4‐D Amine+1200 ml...
  9. The application of various chemicals to cuts made in the stem bases of <em>Brachystegia spiciformis</em> Benth., <em>Julbernardia globiflora</em> (Benth.) Troupin and <em>Terminalia sericea</em> Burch. ex DC.

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Picloram‐potassium and various mixtures of picloram with 2,4‐D amine, 2,4,5‐T ester or amine, or 2,4,5‐T ester alone were injected into incisions made in the cambium of standing Brachystegia spiciformis and Julbernardia globiflora trees. Each arboricide was tested at a range...
  10. The application of various picloram formulations to cut stumps of <em>Brachystegia spiciformis</em> Benth., <em>Julbernardia globiflora</em> (Benth.) Troupin, <em>Terminalia sericea</em> Burch. ex DC. and <em>Acacia karroo</em> Hayne trees

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Trees were felled 150 mm above ground level and various mixtures of picloram with 2,4‐D araine, 2,4,5‐T amine in water solution or 2,4,5‐T ester in diesel oil were applied to the freshly‐cut surfaces. Mixtures of picloram/2,4‐D amine and picloram/2,4,5‐T amine,...