Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 121.
  1. Library Resource
    Articles et Livres
    décembre, 1993

    The incidence of the black bean aphid, Aphis fabae check for this species in other resources scop. (Homoptera: Aphididae), and its colonization of common beans (phaseolus vulgaris L.) grown as sole crop and as intercrops with maize ( Zea mays check for this species in other resources L.) of varying growth stages was evaluated in the field and glasshouse. Modification of bean micro-climate and its effects on A. fabae, and the species range and abundance of coccinellid predators (Coleoptera: Coccinellidae) of the aphid were also assessed. Results showed that A.

  2. Library Resource
    Documents et rapports de conférence
    décembre, 1993

    As the only international centre that is solely concerned with African livestock, ILCA has a responsibility to play a lead role in defining the agenda of research issues related to livestock development and environmental policy in Africa. This paper presents a framework appropriate for defining that agenda and for guiding analysis of particular research issues and gives some detail on how ILCA might approach the specific area of range management policy in the arid and semi-arid areas.

  3. Library Resource
    Documents et rapports de conférence
    décembre, 1993
    Éthiopie, Afrique, Afrique orientale

    Using a linear programming model based on data from smallholdings in the Ethiopian highlands, this paper evaluates the farm level economic efficiency of cow traction and the traditional oxen-pair. Cow traction farm technology has the potential for increasing the net income of farmers at the existing levels of farmers' resources.

  4. Library Resource
    Rapports et recherches
    décembre, 1993
    Éthiopie, Afrique, Afrique orientale

    This chapter describes the distribution, use and importance of Vertisols in Ethiopia and indicates the study sites of the Joint Vertisol Project. Land and soil features are examined with particular reference to parent materials and landscape features, soil characterisation (colour, texture and depth-to-root-restricting layer). Distribution of Vertisols along the 12 physiographic regions of Ethiopia is described, the major agro-ecological zones of Ethiopia is listed, and distribution of Vertisols and their associations in Ethiopia is shown.

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