Articles by Keyword: Climatic Models

Search results for Climatic Models

We found 92 results for you
  1. Genetic variation in survival, growth, and stem form of <em>Pinus leiophylla</em> in Brazil and South Africa and provenance resistance to pitch canker

    Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal
    Pinus leiophylla is a relatively common pine that occurs in the mountains of western and central Mexico. Between 1987 and 1990, Camcore, North Carolina State University, sampled 11 populations and 309 mother trees of the species to determine patterns of...
  2. Optimising stocking rate under commercial and subsistence pastoralism <em>optimisering van veelading by kommersiele en bestaansveeboerdery</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Hopes for a single criterion of overstocking are forlorn. Livestock may be kept for any of many purposes, and the stocking rate optimal for one is not necessarily so for another. Conflicts might be resolved by (1) recognising the likely...
  3. The performance of tropical pastures in the drier phase of the Highland sourveld of Natal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Several tropical grasses (Acroceras macrum, Cenchrus ciliaris, Cyndon sp., Digitaria sp. and Pennisetum clandestinum) and legumes (Desmodium uncinatum and Lotononis bainesii) were evaluated at the Kokstad Research Station (Bioclimatic sub‐region 4f of Natal) over a period of seven years. The...
  4. Ordination of land types in the karoo region into reasonably homogeneous farming areas based on vegetation and environmental factors<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The 291 preliminary land types in the Karoo Region formed the basis for the demarcation of the 144 Reasonably Homogeneous Farming Areas (RHFAs). The land types were firstly reduced to 23 Floristic Climatic Regions (FCRs) according to character species for...
  5. Climatic and edaphic conditions at <em>eragrostis lehmanniana</em> nees sites in Arizona, USA and the cape province, RSA and potential seeding sites in Southern Africa

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Climatic and edaphic conditions at Eragrostis lehmanniana Nees sites in southeastern Arizona, USA were compared with those in the Cape Province, RSA to determine a range of conditions under which the species might be expected to establish and persist in...
  6. The Potch System: An approach to the management of semi‐arid grasslands in southern Africa

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    A host of grassland management systems have been published and recommended. Whereas earlier approaches to grassland management emphasized the systematic resting aspect, the systems published since 1966 have tended to stress the degree of utilization of the grassland sward. In...
  7. Relations between woody and herbaceous components and the effects of bush‐clearing in southern African savannas

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The relations between woody and herbaceous plants in southern African savannas are reviewed in the context of pastoral use. Current knowledge is summarized, important gaps are indicated and research priorities are suggested. Although all savannas consist of a grass and...
  8. Assessment of recent drought severity for natural grassland at three locations

    Assessment of recent drought severity for natural grassland at three locations

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The relative severity of drought in natural grassland during three growing seasons was analyzed for three South African weather stations. Computer simulation of grassland water use, based upon weather records, was used to quantify drought and to compare the conditions...
  9. The persistence in soil and phytotoxicity on dry beans of alachlor and metolachlor as affected by climatic factors

    The persistence in soil and phytotoxicity on dry beans of alachlor and metolachlor as affected by climatic factors

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The persistence of alachlor (2-chloro-2′, 6′-diethyl-N-methoxymethylacetanilide) and metolachlor [2-chloro-6′-ethyl-N-(2-methoxy-1-methylethyl)acet-O-toluidide] in soil was determined over an 80-day period at temperatures ranging from 5 to 50°C. Soils were maintained at either 50 or 100% of field capacity. The herbicides were less persistent...
  10. Preliminary evaluation of two maize (<em>Zea mays</em> L.) growth-simulation models

    Preliminary evaluation of two maize (<em>Zea mays</em> L.) growth-simulation models

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Two maize growth-simulation models developed in the U.S.A., CERES-Malze and CORNF, were evaluated with South African data using graphical and numerical techniques. The results indicate that both models agree well with observed values of total above-ground plant dry mass, leaf...