Articles by Author: J A Wright

Search results for J A Wright

We found 44 results for you
  1. Impact of Wood Quality Assessments on Future Fibre Resources in the Pulp and Paper-making Industry

    Item type: Journal Article • Journal: South African Forestry Journal
    Recent evidence from research in Europe has indicated that individual trees can be sampled for their pulping properties by the removal of small quantities (5–50 g) of wood at about breast height (1,3 m above ground). Work began at Sappi's...
  2. Volume, Pulp and Paper-making Traits of <em>Pinus maximinoi</em> Provenances Planted at Two Sites in South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    Two provenance trials of P. maximinoi H.E. Moore growing in the eastern Transvaal, South Africa, were assessed for growth, pulp and paper-making traits at approximately 11 years of age. Provenances were significantly (p<0,05) different for breaking length, burst index and...
  3. Realised and Predicted Genetic Gain in the <em>Pinus patula</em> Breeding Program of Smurfit Carton de Colombia

    Item type: Journal Article • Journal: South African Forestry Journal
    Narrow sense individual (h2), family (h2 f) and within family (h2 w) heritability values for Pinus patula from three CAMCORE trials in Colombia were calculated for height, diameter at breast height and volume per tree at eight years of age...
  4. The precision of assessing components of the condition of moist tall grassveld

    The precision of assessing components of the condition of moist tall grassveld

    The precision of a rapid technique previously developed to assess veld condition in three grassveld types in Natal was investigated. Three plots were assessed four times on each of three occasions during a growing season. Because basal cover tends to...
  5. Anew optimum value for zinc in the main maize producing sandy soils of South Africa

    Anew optimum value for zinc in the main maize producing sandy soils of South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    South African farmers commenced applying zinc (Zn) during the 1960s at a rate of approximately 2 kg Zn ha−1. Although good yields were produced and Zn levels increased in South African maize fields, a recent survey revealed that maize meal...
  6. Assessment of the food available to Cape anchovy during their spawning season

    Assessment of the food available to Cape anchovy during their spawning season

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The Cape anchovy Engraulis capensis spawns serially between September and February each year on the western Agulhas Bank, South Africa. Food availability in terms of copepod biomass is important for successful spawning and subsequent recruitment. This note investigates the variability...
  7. Retraction and expansion of flock mobility in Central Asia: costs and consequences

    Retraction and expansion of flock mobility in Central Asia: costs and consequences

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Seasonal and spatial fluctuations in forage quality, accessibility and output provide strong incentives for migratory stock keeping in Central Asia. Over the past century, mobile livestock husbandry has either been suppressed or collapsed and a fragmented pattern of rangeland use...
  8. Review

    Item type: Journal Article • Journal: South African Forestry Journal
  9. Silviculture and Genetics of <em>Pinus kesiya</em> for Planting Degraded Pasture Land

    Silviculture and Genetics of <em>Pinus kesiya</em> for Planting Degraded Pasture Land

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The conifer species, Pinus kesiya Royle ex Gordon, is an important part of the ecology within the indigenous range of South-east Asia as well as in sustainably managed plantations in a number of countries. Planting with the species in Colombia...