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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
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.
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.
Revista internacional de silvicultura e industrias forestales
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