Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 19.
  1. Library Resource
    Articles et Livres
    décembre, 1989

    The ionic composition of water in the vadose zone of the Salt River Valley in south central Arizona was studied for three different water regimes: desert, irrigated, and flooded by urban runoff. The desert area exhibited high salinity in the top 10 m, probably due to concentration of salts over several years. Below 15 m, the salinity decreased with depth and approached the salinity of the native ground water. For the irrigated area, the chemical composition of the soil water was similar to that of the applied water but concentrations were higher.

  2. Library Resource
    Articles et Livres
    décembre, 1989
    Amérique latine et Caraïbes

    Recoge textos elaborados en los últimos años por expertos de la CEPAL y por autores externos para la Unidad Conjunta CEPAL/CNUAH de Asentamientos Humanos, en cumplimiento de su programa de trabajo. Los textos se agrupan segun 3 líneas temáticas, 1) Areas críticas para la formulación de políticas de asentamiento humano en América Latina y el Caribe, 2) Metropolización y crisis, y 3) Planificación y gestión del desarrollo nacional: el rol de los gobiernos locales.

  3. Library Resource
    Articles et Livres
    décembre, 1989
  4. Library Resource
    Articles et Livres
    décembre, 1989
    Pakistan, Asie méridionale

    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.

  5. Library Resource
    Articles et Livres
    décembre, 1989
    Pakistan, Asie méridionale

    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.

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