Articles by Author: J Van Staden

Search results for J Van Staden

We found 37 results for you
  1. 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...
  2. Tree Cultivation in Disadvantaged Communities: Successes and Constraints

    Item type: Journal Article • Journal: South African Forestry Journal
    This study dealt with the experiences of forestry extension officers employed by the South African Chief Directorate of Forestry of the Department of Water Affairs and Forestry. The extensionists were active in disadvantaged communities with the primary goal of contributing...
  3. Constructing and marking (assessing) examination questions with special reference to the subjective-type questions

    Constructing and marking (assessing) examination questions with special reference to the subjective-type questions

    Item type: Journal Article • Journal: South African Journal of African Languages
    The present investigation, prompted by data regarding some of the African languages offered at the University of South Africa, focusses on various factors that should be kept in mind when constructing and marking examination papers. Special attention is paid to...
  4. The development of a leaf tensilmeter for <em>in situ</em> measurement of leaf tensile strength

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The development of a portable leaf tensilmeter for the in situ measurement of leaf tensile strength is described. Tensile strength is determined by the distortion of strain gauges on modified stripping pliers which are used to break leaf blades. The...
  5. 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...
  6. An evaluation of the problem of volunteer ryegrass in seed production

    An evaluation of the problem of volunteer ryegrass in seed production

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    This investigation was conducted to establish the degree and means of eliminating unwanted volunteers of Lolium multiflorum from fields used for seed production of a cultivar of the same species. This information is necessary in order to make recommendations with...
  7. Cyclic patterns of growth and rubber deposition in guayule <em>Parthenium argentatum</em>. Suggestions for a management programme

    Cyclic patterns of growth and rubber deposition in guayule <em>Parthenium argentatum</em>. Suggestions for a management programme

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    As the natural pattern of development and rubber synthesis in guayule (Parthenium argentatum) is cyclic any treatments to improve growth and rubber production should be synchronized with the normal sequence of events pertaining to growth and metabolism. Starting with 25-week-old...
  8. The effect of Alar (succinic acid 2,2-dimethylhydrazide) on the growth of cassava (<em>Manihot esculenta</em>) under subtropical conditions

    The effect of Alar (succinic acid 2,2-dimethylhydrazide) on the growth of cassava (<em>Manihot esculenta</em>) under subtropical conditions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of Alar (succinic acid 2,2-dimethylhydrazide) and pruning on cassava (Manihot esculenta Crantz) was studied under subtropical conditions in Natal. Alar application in early summer had little effect on shoot growth and did not increase yield. Pruning at the...
  9. Screening of candidate herbicides in field trials for chemical control of <em>Chromolaena odorata</em>

    Screening of candidate herbicides in field trials for chemical control of <em>Chromolaena odorata</em>

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A range of concentrations of a number of herbicides was tested in field trials, for the control of Chromolaena odorata (L.) R.M. King and H. Robinson. The results obtained show that triclopyr, 2,4,5-T and tebuthiuron were consistently the most effective,...
  10. Release of cotton breeding lines (<em>Gossypium hirsutum</em> L.) adapted to South African conditions

    Release of cotton breeding lines (<em>Gossypium hirsutum</em> L.) adapted to South African conditions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The cotton breeding programme of the Tobacco and Cotton Research Institute has made available a number of advanced breeding lines and cultivars of cotton for a second cycle of intercrossing and selection. Selati, Gariep and NIK3 have been released for...