Afscheid prof. Hellinga

This course teaches the farmer about the water cycle. It covers rainfall, ground water, the water table, surface water, evaporation, and transpiration. It also delivers information on wells and springs, swamps, ponds, lakes, streams and rivers. It explains how water is necessary for life.

Description of the socioeconomic organization of the Borana pastoralists with particular reference to the Gada System and the traditional well organization.

Een verzameling artikelen, gepubliceerd ter gelegenheid van het 25 jarig bestaan van het ILRI te Wageningen.

Policy makers as well as scientists have started to acquire an honest appreciation of the possibilities of reducing the wastage of materials which could be profitably utilized for improving or maintaining soil productivity. In addition, the great opportunities offered by making more efficient use of the potentials of biological nitrogen fixation in farming systems are now fully recognized. A number of recommendations and suggested guidelines were made by the various Working Groups during the two-week Workshop.

The pressing need for increased agricultural production in the years ahead can only be met by more efficient use of our land and water resources including more widespread and better irrigation in those regions where rainfall is inadequate. Production gains will be shortlived unless the attendant hazards of salinization, water logging and lowered fertility are kept in check by effective planning and management based on a thorough understanding of the soil conditions. Soil survey and land classification are generally accepted essential preliminaries to investment in irrigation development.

Revista internacional de silvicultura e industrias forestales

Revue internationale des forts et des industries forestires

An international journal of forestry and forest industries

Dans sa premire partie, cette tude tente de faire le point de la situation de l'effort de pche actuel exerc dans les principaux plans d'caux du Pays. Les seuls paramtres disponibles pour cette valuation datent de 10 20 ans, aucune donne plus rcente n'ayant t recueillie. Cette lacune est due en grande partie la faiblesse de la structure de la Division Pche et Pisciculture de la Direction des Eaux et Forts, reste jusqu'alors au stade embryonnaire, ainsi qu'au manque de budget.

Cette synthèse regroupe les résultats essentiels de l'Etude hydrologique et présente la méthodologie d'utilisation du modèle ORSTOM étendu. Ce modèle permet de déterminer la crue décennale à partir de la pluie décennale.