Articles by Author: Marief Smith

Search results for Marief Smith

We found 244 results for you
  1. Some factors effecting the dry matter production of lucerne cultivars

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Dry matter yields of lucerne cultivars were affected by different factors. A simple equation is given for predicting total dry matter yield of irrigated lucerne based on mean maximum temperatures in January.
  2. The relative yield potential of westerwolds and Italian ryegrass cultivars in autumn‐planted pastures and their flowering patterns following spring‐establishment

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Herbage yields from autumn‐planted Lolium multiflorum cultivar trials conducted in the Natal Mist Belt indicated that, in general, the Westerwolds ryegrass cultivars had greater yield potential than the Italian ryegrass cultivars during the cold winter months. Conversely, the Italian ryegrass...
  3. Defoliation effects on resource allocation in Arizona cottontop (<em>Digitaria californica</em>) and Lehmann lovegrass (<em>Eragrostis lehmanniana</em>)

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Arizona cottontop (Digitaria californica), a bunchgrass native to the Chihuahuan and Sonoran Deserts in North America, and Lehmann lovegrass (Eragrostis lehmanniana), a bunchgrass introduced to the southwestern USA from southern Africa, were defoliated and examined for above‐ and below‐ground productivity,...
  4. A multivariate approach to a specific problem of grouping maize cultivars

    A multivariate approach to a specific problem of grouping maize cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The use of multivariate techniques in the analysis of multivariate problems is illustrated by comparing the results of univariate and multivariate techniques applied to the problem of establishing the nutritional requirements of, and the acid tolerance differences between maize cultivars...
  5. The success of the AMMI model in predicting lucerne yields for cultivars with differing dormancy characteristics

    The success of the AMMI model in predicting lucerne yields for cultivars with differing dormancy characteristics

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The AMMI model, which incorporates both additive and multiplicative components into an integrated, powerful, least squares analysis, is used for the analysis of cultivar trials at different localities. These trials are a major experimental component in crop production and plant...
  6. AMMI analysis of potato cultivar yield trials

    AMMI analysis of potato cultivar yield trials

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Potatoes, Solanum tuberosum (L), are cultivated in South Africa under a variety of different climates and seasons. The wide environmental variation encountered and the confirmed occurrence of genotype-environmental interaction necessitates the use of criteria, other than averages, in the evaluation...
  7. Comparison of protein extraction procedures to assess the effect of quantitative protein composition on the bread-making quality of South African winter wheat cultivars

    Comparison of protein extraction procedures to assess the effect of quantitative protein composition on the bread-making quality of South African winter wheat cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A suitable technique for the extraction of wheat flour protein fractions was pursued to assess the effect of quantitative protein composition on the bread-making quality of winter wheat cultivars on a large scale. Nine procedures involving the use of different...
  8. Multivariate assessment of environmental effects on hard red winter wheat. I. Principal-components analysis of yield and bread-making characteristics

    Multivariate assessment of environmental effects on hard red winter wheat. I. Principal-components analysis of yield and bread-making characteristics

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The attributes of yield and bread-making quality of winter wheats produced in the Free State are subject to environmental effects. The result is a supply to the baking industry of flour of inconsistent quality, which in turn is detrimental to...
  9. Multivariate assessment of environmental effects on hard red winter wheat. II. Canonical correlation and canonical variate analysis of yield, biochemical and bread-making characteristics

    Multivariate assessment of environmental effects on hard red winter wheat. II. Canonical correlation and canonical variate analysis of yield, biochemical and bread-making characteristics

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The inconsistent production of winter wheat with acceptable bread-making quality in the Free State reduces the commercial value of the wheat crop. In the second part of this study, canonical correlation analysis was used to determine to what extent variation...
  10. Determination of the preharvest sprouting resistance of South African winter wheat (<em>Triticum aestivum</em> L.) cultivars

    Determination of the preharvest sprouting resistance of South African winter wheat (<em>Triticum aestivum</em> L.) cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Preharvest sprouting significantly reduces the quality of the South African wheat crop. This study classified the preharvest sprouting resistance of 17 South African winter wheat cultivars sampled over a range of typical winter wheat growth environments. Sampling was performed under...