Articles by Author: Fj Jacobs

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  1. The Effect of Storage Time, Temperature and Container on the Viability of the Seed of Four Pine Species

    Item type: Journal Article • Journal: South African Forestry Journal
    Seeds of four pines, Pinus elliottii, P. patula, P. radiata and P. taeda, each represented by three stock numbers, were stored in linen bags and PVC containers at room temperature, 2 to 3°C and −16°C for 25 years. Germination capacity...
  2. Comparison Between a Commercial Fertiliser Prescription and Soluble and Granular Forms of 2:3:2 and 3:2:1 With and Without Trace Elements as Applied to <em>E. grandis</em> Seedlings

    Item type: Journal Article • Journal: South African Forestry Journal
    A trial designed to test various fertilisers clearly demonstrated that good growth in the nursery and adequate initial growth in the field of Eucalyptus grandis seedlings could be obtained from any of the mixes tested. The soluble form of the...
  3. Micropropagation <em>of Eucalyptus radiata ssp. radiata</em> Using Explants from Mature and Coppice Material

    Item type: Journal Article • Journal: South African Forestry Journal
    Nodes from young field-grown coppice regrowth and branches of a mature tree of Eucalyptus radiata ssp. radiata were cultured on a MS medium containing BA and NAA. BA at 0,5 mg/ℓ and NAA at 0,01-0,1 mg/ℓ were most effective in...
  4. Effect of triadimefon on fruit set and seed development of ‘Starking Delicious’ apple

    Effect of triadimefon on fruit set and seed development of ‘Starking Delicious’ apple

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Spray applications of triadimefon (TDF) (1–4 chlorophenoxy 3,3 dimethyl 1–1-H-1,2,4 triazol 1-yl-2 butanone) (5% W.P.) at 100 mg dm−3 active ingredient at full bloom and pre- and/or post-full bloom on ‘Starking Delicious’ apple trees (Malus domestica Borkh.) increased fruit set...
  5. Effect of a foliar application of paclobutrazol in autumn on the reproductive development of ‘Songold’ plum

    Effect of a foliar application of paclobutrazol in autumn on the reproductive development of ‘Songold’ plum

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A foliar application of paclobutrazol (1- (4-chlorophenyl) −4,4-dimethyl-2- (1,2,4- triazol-1-yl) pentan-3-ol) at 250 or 500 mg dm−3 a.i. in autumn, or late winter applications of dinitro-o-cresol oil emulsion (DNOC) in water at 3% v/v, increased the percentage of ‘Songold’ plum...
  6. Manipulation of acrotony in one-year-old apple shoots

    Manipulation of acrotony in one-year-old apple shoots

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Unbranched rooted layers of the rootstock Mailing 9 (M.9 clone Nie 29) ≈600 mm long were treated twice in autumn (4 and 13 October 1995) in the stoolbed as follows: a) non-treated control; b) the distal 300 mm of the...
  7. Anatomical and compositional changes during fruit development of ‘Galia’ melons

    Anatomical and compositional changes during fruit development of ‘Galia’ melons

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    ‘Galia’ melons were grown under controlled conditions and pruned to bear two fruits with 19 leaves per plant. Leaves and fruits were sampled and analysed at eight different stages. Pericarp cell division and enlargement occurred during the first week after...
  8. Budburst and yield of ‘Peeka’ apricot influenced by time and concentration of hydrogen cyanamide application

    Budburst and yield of ‘Peeka’ apricot influenced by time and concentration of hydrogen cyanamide application

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The rest-breaking response of ‘Peeka’ apricots (P. armeniaca L.) grown locally under conditions of inadequate winter chilling to 0%, 0.25%, 0.5%, 0.75%, and 1% hydrogen cyanamide sprayed 29 July, 3 August, 13 August, and 17 August 1987 is reported, owing...
  9. Exogenously applied ethylene reduces the cold requirement for ripening of pears (<em>Pyrus communis</em> L.) cv. Forelle

    Exogenously applied ethylene reduces the cold requirement for ripening of pears (<em>Pyrus communis</em> L.) cv. Forelle

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    ‘Forelle’ pears harvested at commercial maturity were treated with ethylene at 0, 10 or 100 μl 1−1 for 24 hours at 20°G before being stored at-0.5°Cfor 12 weeks. Periodic sampling of the fruit showed that both ethylene treatments significantly hastened...
  10. The effect of rootstock cultivar on the yield and fruit quality of ‘Packham's Triumph’, ‘Doyenne du Comice’, ‘Forelle’, ‘Flamingo’ and ‘Rosemarie’ pears

    The effect of rootstock cultivar on the yield and fruit quality of ‘Packham's Triumph’, ‘Doyenne du Comice’, ‘Forelle’, ‘Flamingo’ and ‘Rosemarie’ pears

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Production data and questionnaire results concerning the long-term effects of various rootstocks on pear (Pyrus communis L.) yield indicated that BP1 and BP3 are currently the preferred rootstocks in the South African industry. Yield records of ‘Packham's Triumph’ pears indicated...