An international journal of forestry and forest industries

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.

Revista internacional de silvicultura e industrias forestales

Le gouvernement d’un pays africain peut adopter une politique de promotion de la transformation en aval de façon à augmenter sa part dans la capacité mondiale de transformation en vue d'accroitre les recettes d’exportation. Pour atteindre ces objectifs il peut décider de créer de nouvelles capacités de production ou de développer la capacité de transformation en aval des matières premières produites dans le pays.

On peut distinguer trois grandes périodes dans l'évolution de l’exploitation minière de l'Afrique en développement : la période précoloniale qui se situe avant 1890, date du paréage du continent en colonies, 1ère coloniale et les premiers temps de l'après-indépendance (de 189O à 1969 environ) et la période allant de le fin de la période d’accession à l’indépendance à nos jours (à partir de 1970).

An international journal of forestry and forest industries

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.

Methods for evaluating nutrient status in order to obtain better plant growth and increased yield are constantly being developed and improved. New analytical techniques and procedures for soil and plant analysis have been invented and tested in many countries and laboratories. There have been innovations in data processing leading to preparation of more refined and specific fertilizer recommendations. The purpose of the Consultation was: i.

Revista internacional de silvicultura e industrias forestales

The Study Tour was financed by the UNDP and had the following objectives. To gain knowledge and experience in: - The multiplication of Azolla as a source of biological nitrogen, particular attention being paid to propagation of Azolla and its protection form disease, insect damage and adverse climatic conditions. - Harvesting and agricultural use of Azolla. - Contruction of small-scale biogas units. - Management of biogas units and efficient use of the gas by farming communities and of the effluents for improving soil fertility

Para cumplir los objetivos establecidos por el artículo 2º del Decreto Ley Nº 2811 de 1974, el presente Decreto tiene por finalidad reglamentar las normas relacionadas con el recurso de aguas en todos sus estados, y comprende los siguientes aspectos: 1) El dominio de las aguas, cauces y riberas, y normas que rigen su aprovechamiento sujeto a prioridades, en orden a asegurar el desarrollo humano, económico y social, con arreglo al interés general de la comunidad.