Articles by Keyword: Additive Main Effects And Multiplicative Interaction

Search results for Additive Main Effects And Multiplicative Interaction

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  1. Genotype × environment interactions and yield stability of stress-tolerant open-pollinated maize varieties in the Eastern Cape province, South Africa

    Genotype × environment interactions and yield stability of stress-tolerant open-pollinated maize varieties in the Eastern Cape province, South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Genotype × environment interactions are inherent in multilocational trials and complicate identification of superior genotypes. The aim of the study was to determine yield performance and stability of 13 maize genotypes in five locations of the Eastern Cape province, South...
  2. Agronomic performance of new cream to yellow-orange sweetpotato cultivars in diverse environments across South Africa

    Agronomic performance of new cream to yellow-orange sweetpotato cultivars in diverse environments across South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Sweetpotato is grown in diverse environments of South Africa by both commercial and subsistence farmers. The aim of the present study was to assess the stability, agronomic performance and palatability of new ARC cultivars bred for the informal market, and...
  3. Genetic Improvement of Timber Yield and Wood Quality in <em>Eucalyptus Grandis</em> (Hill) Maiden

    Item type: Journal Article • Journal: South African Forestry Journal
    Results of a partial diallel progeny test of Eucalyptus grandis assessed at ages 5, 36, 60 and 105 months are presented. Large genetic variations among full-sib families were found for all traits studied, e.g. the mean tree volume per family...
  4. 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...
  5. The Role of Genotype-Environment Interaction in Adaptability

    Item type: Journal Article • Journal: South African Forestry Journal
    The over sites ratio of clonal (familial) genotype-environment interaction (GEI) variance to mean trial variance determines the regression that is used to predict adaptability. Genotypic and environmental variances do not contribute significantly to this regression. Genotype x environment interaction effects...
  6. Pine Provenance Research in South Africa: Promises and Problems

    Item type: Journal Article • Journal: South African Forestry Journal
    Provenance research really started with the work of H.L. Duhamel Du Monceau on Pinus sylvestris in the eighteenth century. In South Africa the first properly designed provenance trials were established between 1934 and 1936 with the testing of five races...
  7. The Hydrological Effects of a Wildfire in a Eucalypt Afforested Catchment

    Item type: Journal Article • Journal: South African Forestry Journal
    A high-intensity wildfire through a humid, upland catchment which was partially afforested to Eucalyptus fastigata, markedly increased stormflows and caused high soil losses off the afforested slopes. Total streamflow yield was unchanged but baseflow was reduced after the fire. The...
  8. The Genetic Control of Ring Width, Wood Density and Tracheid Length in the Juvenile Core of <em>Pinus patula</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    Controlled crosses were made between six Pinus patula Schiede & Deppe plus trees selected in plantations. Six full-sib families and two commercial checks were planted in randomised complete block thrice-replicated progeny tests at two sites in Zimbabwe. At 7,5 years,...
  9. Die invloed van stikstoftoediening, saaidigtheid en metode van vermenging van komponente op mengsels van <em>Trifolium vesiculosum</em> en <em>Lolium multiflorum</em> <sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The influence of nitrogen application, seeding rate and methods of mixing of components on mixtures of Trifolium vesiculosum and Lolium multiflorum. The interaction between Trifolium vesiculosum cv. Amclo and Lolium multiflorum cv. Midmar in mixtures was measured in an irrigated...
  10. A preliminary investigation of area‐selective grazing in the Southern Tall Grassveld of Natal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The consequences of area‐selective grazing by cattle under three stocking rates and at two sites in the Southern Tall Grassveld of Natal were investigated. Soil compaction was found to significantly distinguish area‐selected patches from non‐selected veld (P≤0.01), while non‐significant differences...