Articles by Keyword: Sunflower

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  1. Effect of planting date on the phenology, seed yield, and fatty acid composition of three sunflower <em>(Helianthus annuus</em> L.) cultivars

    Effect of planting date on the phenology, seed yield, and fatty acid composition of three sunflower <em>(Helianthus annuus</em> L.) cultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four planting dates (early October to mid-January) were used to obtain a range of environmental conditions for growing three sunflower cultivars. The effect of planting date on phenological development was small compared to that of genotype though the hybrid S0404...
  2. Invloed van bemesting op die oliekonsentrasie oliekwaliteit van sonneblomsaad

    Invloed van bemesting op die oliekonsentrasie oliekwaliteit van sonneblomsaad

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Influence of fertilization on the oil concentration and oil quality of sunflower seed. Fertilizer trials (N,P,K and lime) were conducted over two seasons at three localities. Results indicate that 150 kg N ha−1 fertilizer decreased the oil concentration of the...
  3. 'n Nuwe benadering tot die bepaling van hitte-eenhede vir sonneblom

    'n Nuwe benadering tot die bepaling van hitte-eenhede vir sonneblom

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die konvensionele metode vir die bepaling van hitte-eenhede is vergelyk met 'n nuwe benadering. Data uit sewe kultivarproewe insluitende daaglikse maksimum en minimum temperature is gebruik om die hitte-eenhedevereistes van drie kultivars te bepaal. Twee vergelykings is gebruik, een verteenwoordig...
  4. Die effek van plantpopulasie op die saadopbrengs van sonneblomkultivars

    Die effek van plantpopulasie op die saadopbrengs van sonneblomkultivars

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    'n Aantal sonneblombasters is vergelyk by drie plantpopulasies oor twee seisoene te Ermelo, Sandvet en Warmbad. Die doel was om die kompensasievermoë van kultivars te bepaal vir 'n swak stand. Onder laepotensiaal-toestande was die kultivar X plantpopulasie-interaksie nie beduidend nie,...
  5. Variasie in lipied- en proteïeninhoud van sonneblomsaad en oliekoekmele in Suid-Afrika

    Variasie in lipied- en proteïeninhoud van sonneblomsaad en oliekoekmele in Suid-Afrika

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die variasie in die chemiese samestelling van sonneblom- saad, wat uit verskillende areas aan oliepersers gelewer is, en die invloed daarvan op die samestelling van die geproduseerde oliekoekmele is in die studie ondersoek. Die ontleding van die sade het 'n...
  6. The importance of certain insects as pollinators of sunflower (<em>Helianthus annuus</em> L.)

    The importance of certain insects as pollinators of sunflower (<em>Helianthus annuus</em> L.)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    This study reports the effects of Apis mellifera L. (honeybees), Astylus atromaculatus Blanchard (spotted maize beetles), Heliothis armigera Hübner (American bollworm larvae) and Musca domestica L. (house flies) on seed set in commercial sunflower. The pollination efficiency of these insects...
  7. Diversity, abundance and behaviour of diurnal insects on flowering capitula of commercial sunflower in the Transvaal

    Diversity, abundance and behaviour of diurnal insects on flowering capitula of commercial sunflower in the Transvaal

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Sunflower, Helianthus annuus L., is an insect-pollinated crop and the different insect taxa visiting the flowering head play a role of greater or lesser importance in cross-pollination. Species diversity, abundance and behaviour of insects visiting commercial sunflower during flowering are...
  8. Evidence that alachlor selectivity in sunflower is based on depth-protection

    Evidence that alachlor selectivity in sunflower is based on depth-protection

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The relative importance of the underground shoot parts (hypocotyl) and roots of sunflower (Helianthus annuus L.) seedlings on the absorption of alachlor [a-chloro-2′,6′-diethyl- N-(methoxymethyl) acetanilide] was studied in a glasshouse experiment. A layer of activated charcoal divided the soil in...
  9. High availability of alachlor affects the roots and general growth of sunflower seedlings

    High availability of alachlor affects the roots and general growth of sunflower seedlings

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The tolerance to alachlor [α-chloro-2′,6′?diethyl-N-(metoxy- methyl) acetanilide] of three sunflower (Helianthus annuus L.) cultivars was evaluated in an aqueous medium in a glass- house. Alachlor (0.79 - 6.32 mg L−1) caused significant reductions in the root and shoot growth of...
  10. The effect of a diurnal period of supra-optimal temperature on the seed vigour of sunflower

    The effect of a diurnal period of supra-optimal temperature on the seed vigour of sunflower

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The daily maximum temperature in the upper 20 mm of sandy soils is often higher than 45°C on cloudless days during November, December and January in the summer rainfall region of South Africa. At these supra-optimal temperatures, sunflower seedling vigour...