Articles by Author: Paul F Donald

Search results for Paul F Donald

We found 244 results for you
  1. Varied diet and opportunistic foraging in the Ethiopian Bush-crow <em>Zavattariornis stresemanni</em>, an Endangered generalist

    Varied diet and opportunistic foraging in the Ethiopian Bush-crow <em>Zavattariornis stresemanni</em>, an Endangered generalist

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The Ethiopian Bush-crow Zavattariornis stresemanni is an endangered, co-operatively breeding southern Ethiopian endemic with a remarkably restricted range (c. 6 000 km2). The species’ range was recently found to be almost perfectly predicted by an envelope of cooler, drier and...
  2. The Application of Inorganic Fertilisers to Conditioned <em>Pinus radiata</em> Prior to Lifting as a Means of Improving Root Growth Capacity

    Item type: Journal Article • Journal: South African Forestry Journal
    A modified root growth capacity technique was used to evaluate the effect of the application of different types and quantities of fertilisers on the root growth capacity (RGC) of conditioned Pinus radiata seedlings. The experiment indicates that 0,05 g N...
  3. Resistance of Seedling Progeny of <em>Pinus pinaster</em> and <em>P. radiata</em> to the Pine Woolly Aphid <em>Pineus pini</em> L.

    Item type: Journal Article • Journal: South African Forestry Journal
    Seedlings raised from seed collected from 64 Pinus pinaster ortets and 20 P. radiata ortets which were free from Pineus pini in the plantations and seed orchards of the Southern Cape were infected with eggs of the pest. After three...
  4. The Effects of Nitroacta (Urea formaldehyde) on the Survival and Growth of <em>Pinus elliottii</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    A pot trial testing the effect of no nitrogen, one level of urea and three levels of urea formaldehyde (Nitroacta) on the survival and growth of Pinus elliottii Engelm. is described. Survival, shoot increment, root/shoot ratio and mycorrhizal infection were...
  5. ENID: An Expert System for Fertiliser Prescription in the Cape Province of South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    A lack of extension officers and a shortage and rapid turnover of research and regional management staff involved in plantation nutrition was seen as a problem in the Cape Province. Opportunities for increasing timber production by addition of fertilisers were...
  6. 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...
  7. Litterfall and Nutrient Release in Mature <em>Pinus radiata</em> in the South-western Cape

    Item type: Journal Article • Journal: South African Forestry Journal
    Fast-growing plantations of conifers have replaced areas of mediterranean shrubland in the south-western Cape. This study arises from the need to quantify the impacts of major changes in primary productivity, litterfall, and nutrient cycling in terms of the site utilisation...
  8. BOOK REVIEWS

    Item type: Journal Article • Journal: South African Forestry Journal