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Resultados de la búsqueda

Mostrando ítems 1 a 9 de 20.
  1. Library Resource
    Políticas Nacionales
    Enero, 1990
    Maldivas

    This Action Plan is a nation-wide sectoral document aiming at helping the Government to maintain and improve the environment, including the marine and ocean area contained within the Exclusive Economic Zone, and to manage the resources contained therein for the collective benefit and enjoyment of present and future generations.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 1989

    Summarises past and present experiences with livestock performance testing in sub-Saharan Africa and outlines the role of networks in improving on-farm testing through the use of standardised testing methods and rapid data handling and feedback. Includes data on the distribution of cattle and sheep populations by ecological zone in sub-Saharan Africa. Presents current programmes for on-farm and on-station performance recording.

  3. Library Resource
    Informes e investigaciones
    Diciembre, 1989
    Zimbabwe, África, África austral

    Throughout Africa the importance of land use issues in relation to tsetse control planning has been emphasized consistently in the tsetse literature. Because of inappropriate land use, concerns for the environment in tsetse-freed areas have been expressed frequently. This debate is very relevant to Zimbabwe, where extensive tsetse control operations in recent years have confined the remaining area of tsetse infestation to parts of the Zambezi valley, a semi-arid region of the country with a fragile eco-system and limited agricultural potential.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 1989
    Etiopía, África, África oriental

    Investigates the effects of improved surface drainage on the productivity of Vertisols in a wheat-and-chickpea cropping trial conducted in 1987 at ILCA;s Debre Zeit research site in the Ethiopian highlands. Chickpea plots were subjected to four irrigation treatments, viz, no irrigation, irrigation at planting, 35 days and 70 days after planting. The trial showed that with a starter irrigation to aid the germination of a second crop, sequential cropping of two crops in the same growing season is feasible in the Debre Zeit.

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 1989
    Pakistán, Asia meridional

    This paper is a preliminary effort to define the extent of irrigation in Pakistan's mountain regions. Attention is given to some changes already begun in this environment through new irrigation development activities. Important knowledge gaps that need to be filled by more systematic and multidisciplinary research are identified.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 1989
    Pakistán, Asia meridional

    This paper presents an overview of the current state of knowledge on the relations between irrigation management in Pakistan and the incidence of waterlogging and salinity. It is emphasized that management research should focus on the whole system, including surface and ground water resources. The paper also highlights key management questions that need to be addressed such as salt and water balance and water loss from canals, water courses and field channels.

  7. Library Resource
    Documentos de conferencias e informes
    Diciembre, 1989
    Malí, África, África occidental

    This study identifies the causes of the observed differences in flock productivity in a central Malian village, in a rainfed millet agropastoral subsystem. Small ruminant productivity, management factors and socio-economic characteristics are analysed. The causes leading to the observed differences in small ruminant productivity are related to the owner's socioeconomic characteristics, to his management strategies or to preferences for one or the other small ruminant species.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 1989
    Sri Lanka, Asia sudoriental

    This paper analyzes irrigation operational problems, and their institutional causes, on a new irrigation system in southern Sri Lanka, based on research during disastrous drought. The authors offer a number of suggestions for improving the management of this system.

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