Articles by Author: Richard G Payn

Search results for Richard G Payn

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  1. Screening of fungicides for the management of wattle rust (<em>Uromycladium acaciae</em>) in <em>Acacia mearnsii</em> plantations, South Africa

    Screening of fungicides for the management of wattle rust (<em>Uromycladium acaciae</em>) in <em>Acacia mearnsii</em> plantations, South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    South Africa has c. 110 000 ha planted to Acacia mearnsii (black wattle) with 85% of the revenue from the species obtained from the timber and 15% from the bark. From 2012/13 a wattle rust disease has spread throughout the...
  2. Use of adjuvants and fungicide application timing for the control of wattle rust (<em>Uromycladium acaciae</em>) in <em>Acacia mearnsii</em> plantations in South Africa

    Use of adjuvants and fungicide application timing for the control of wattle rust (<em>Uromycladium acaciae</em>) in <em>Acacia mearnsii</em> plantations in South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Acacia mearnsii (black wattle) plantations in South African cover approximately 110 000 ha, with Uromycladium acaciae (wattle rust) found from Limpopo to the Western Cape of South Africa. This disease of black wattle causes reductions in growth, and mortalities with...
  3. Factors Affecting Soil Phosphate Distribution and Reactions in Cape Forest Soils

    Item type: Journal Article • Journal: South African Forestry Journal
    The amounts of various forms of phosphate in some Cape soils and the adsorption of phosphate by these soils were investigated. The levels were low and only 2% was in available form. The major fraction of phosphate in the soil...
  4. 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...
  5. Multiple Resource Utilisation Developments in Mondi Forests

    Item type: Journal Article • Journal: South African Forestry Journal
    Defined as the use of available resources other than the planted trees on Mondi's landholdings, the development of various MRU projects is described from 1975 onwards. Projects are differentiated into those that are directly dependant on the presence of planted...
  6. The Fieldes and Perrott field test as an aid to identification for podzol B horizons

    The Fieldes and Perrott field test as an aid to identification for podzol B horizons

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The Fieldes and Perrott test for allophane was assessed as an aid to identifying podzol horizons. The test was compared to the chemical criteria for podzol B horizons on 51 B horizon samples collected in the southern Cape. In 37...
  7. Complete compositions of a natural number

    Complete compositions of a natural number

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    An alternative proof is given for the recently established fact that approximately one half of all compositions of a natural number are complete.
  8. ABOUT THE RADIUS OF CONVERGENCE OF THE ZETA FUNCTION OF AN ADDITIVE ARITHMETICAL SEMIGROUP

    ABOUT THE RADIUS OF CONVERGENCE OF THE ZETA FUNCTION OF AN ADDITIVE ARITHMETICAL SEMIGROUP

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Let (G, ∂) be an additive arithmetical semigroup in John Knopfmacher's sense with f(n), g(n) denoting the number of all elements, prime elements of G with degree ∂ = n.