Articles by Author: Onisimo Mutanga

Search results for Onisimo Mutanga

We found 9 results for you
  1. Determining the optimal phenological stage for predicting common dry bean (<em>Phaseolus vulgaris</em>) yield using field spectroscopy

    Determining the optimal phenological stage for predicting common dry bean (<em>Phaseolus vulgaris</em>) yield using field spectroscopy

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    On-farm crop productivity and yield prediction are valuable for, among others, designing food policies, on-farm and after-farm planning and pricing, and marketing. Whereas existing prediction approaches are generally reliable, these require extensive and tedious field surveys and adequate ancillary agrometeorological...
  2. Challenges and opportunities in the use of remote sensing for C<sub>3</sub> and C<sub>4</sub> grass species discrimination and mapping

    Challenges and opportunities in the use of remote sensing for C<sub>3</sub> and C<sub>4</sub> grass species discrimination and mapping

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Changes in the composition of plant functional type (PFT) activities are expected to accompany a changing climate. In tropical montane grasslands, such changes are predicted to follow shifts in the percentage cover and abundance of species following the C3 and...
  3. Veld fire reporting and mapping techniques in the Kruger National Park, South Africa, from 1941 to 2011

    Veld fire reporting and mapping techniques in the Kruger National Park, South Africa, from 1941 to 2011

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Fire has long been regarded as a major determinant of ecosystem structure and function within African savannas. Improvements in fire detection, mapping and recordings of fire activity over the past few years have made it possible to provide more reliable...
  4. Desertification and Risk Analysis using High and Medium Resolution Satellite Data: Training Workshop on Mapping Desertification

    Desertification and Risk Analysis using High and Medium Resolution Satellite Data: Training Workshop on Mapping Desertification

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    2009, Springer, PO Box 17, 3300 AA Dordrecht, The Netherlands, 274 pages, hardcover, ISBN 978-1-4020-8935-0. Price €139.95
  5. Optimum rabbit density over fish ponds to optimise Nile tilapia production in an integrated rabbit–fish system in Rwanda

    Optimum rabbit density over fish ponds to optimise Nile tilapia production in an integrated rabbit–fish system in Rwanda

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Although previous studies have suggested that rabbit excreta can be used as high-quality manure for sustaining plankton production due to their gradual nutrient release, integrated rabbit–fish production systems are still not widely used. Between 2006 and 2010 optimal rabbit densities...
  6. Variation in foliar water content and hyperspectral reflectance of <em>Pinus patula</em> trees infested by <em>Sirex noctilio</em>

    Variation in foliar water content and hyperspectral reflectance of <em>Pinus patula</em> trees infested by <em>Sirex noctilio</em>

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The remote detection and quantification of symptoms associated with declining forest health is critical for the introduction of proper pest monitoring and control measures. Sirex noctilio, the Eurasian wood wasp, is one of the major pests responsible for declining forest...
  7. The potential of remote sensing technology for the detection and mapping of <em>Thaumastocoris peregrinus</em> in plantation forests

    The potential of remote sensing technology for the detection and mapping of <em>Thaumastocoris peregrinus</em> in plantation forests

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Thaumastocoris peregrinus is a sap-sucking insect that feeds on eucalyptus leaves. It poses a major threat to the forest sector by reducing the photosynthetic ability of the tree, resulting in stunted growth and even death of severely infested trees. The...
  8. Water quality monitoring in sub-Saharan African lakes: a review of remote sensing applications

    Water quality monitoring in sub-Saharan African lakes: a review of remote sensing applications

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Water quality deterioration in sub-Saharan Africa has attained a scale that requires scientific intervention. It is therefore important to devise appropriate and reliable techniques to investigate the water quality of lakes and reservoirs for the development of water resource management...
  9. Forest health and vitality: the detection and monitoring of <em>Pinus patula</em> trees infected by <em>Sirex noctilio</em> using digital multispectral imagery

    Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal
    The Eurasian woodwasp, Sirex noctilio, causes considerable tree mortality in commercial pine plantations in southern KwaZulu-Natal, South Africa. Broad-scale visual assessments of infestation provided by forest managers are currently used to measure forest health and vitality. The effectiveness of visual...