Articles by Keyword: Simulation

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  1. Die wiskundige simulering van koolhidraattranslokasie in natuurlike grasveld<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die groeifunksies benodig vir die simulasie van produksie van ‘n Themeda triandra‐grasveld met behulp van die PUTU 11 simulasiemodel is ontwikkel. Vir die ontwikkeling van die model is die veldproduksiedata van die 1980/81 groeiseisoen gebruik waarna dit suksesvol, vir drie...
  2. Simulating browse production and response of <em>Acacia karroo</em> to defoliation I. Model description and sensitivity analyses

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The model is aimed at synthesizing existing data to enhance the understanding of this data and explore the consequences of possible browse management strategies. It gives a good reproduction of the shoot and leaf growth responses used to develop it...
  3. Simulating browse production and response of <em>Acacia karroo</em> to defoliation II. Evaluation of browse management systems and strategies

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    To assess management implications, a model was used to simulate the response of Acacia karroo to a wide range of different climatic patterns and defoliation regimes. The model predicts that if poor growing conditions initiate growth later in spring than...
  4. 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...
  5. 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...
  6. Effect of soil surface amendments on runoff and erosion from simulated rain applied to a sesquioxidic soil

    Effect of soil surface amendments on runoff and erosion from simulated rain applied to a sesquioxidic soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Simulated rainfall, using low conductivity water, was applied at an intensity of 63 mm h−1 to a field soil of the Doveton series (a kaolinitic, sesquioxidic clay soil at Cedara in Natal, recently cultivated out of pasture) after pre-treatment of...
  7. A growth model for sugar-cane based on a simple carbon balance and the CERES-Maize water balance

    A growth model for sugar-cane based on a simple carbon balance and the CERES-Maize water balance

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The economic optimum harvest age for sugar-cane depends to a large extent on how rates of photosynthesis and respiration change with age. A simple model of the carbon balance in which a constant photosynthetic efficiency was assumed, accounted to a...
  8. A family of stochastic models for droughts

    A family of stochastic models for droughts

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    There is no single quantitative definition of a drought; what constitutes a drought depends both on water needs and on storage capabilities. In this paper a family of models is proposed which is sufficiently flexible to cover a range of...
  9. Prosedures en probleme by die gebruik van die PUTU9–87 gewasgroeisimulasiemodel vir koring onder besproeiing in die Vanderkloof-Staatswaterskema

    Prosedures en probleme by die gebruik van die PUTU9–87 gewasgroeisimulasiemodel vir koring onder besproeiing in die Vanderkloof-Staatswaterskema

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die doel van hierdie ondersoek was om die PUTU9–87 gewasgroeisimulasiemodelte kalibreer om koringop-brengste en die grondwaterinhoud op 'n bevredlgende wyse in die Vanderkloof-Staatswaterskema te voor- spel, gegewe beperkte eksperimentele data. Opbrengste wat met PUTU voorspel is, word vergelyk met eksperimentele...
  10. Evaluering en kalibrering van CERES-Maize: 3. Rywydtes in die westelike Hoëveld

    Evaluering en kalibrering van CERES-Maize: 3. Rywydtes in die westelike Hoëveld

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In die westelike-Hoëveld waar reënval die mees beperkende hulpbron is, is lae plantpopulasie en wye rye erkende produksiepraktyke vir mielies. Die praktyke verskil beduidend van die praktyke waaronder CERES- Maize ontwikkel is. Ten einde CERES-Maize te evalueer ten opsigte van...