By Professor Dr. A. De Philippis (auth.), R. N. Kaul (eds.)

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00 The cost of production of young plants in the nurseries continues to be about one-ninth of the cost of the first year of afforestation. Preparation rf the Land The techniq ue of preparation ofland for afforestation has undergone a great modification in the last fifteen years. Until 1950, the preparation of land for afforestation followed a set pattern of digging 40 cm 3 pits at regular intervals in order to obtain a density of 2,000 to 2,500 pits per hectare. A more efficient preparation of land was being carried out in case of very steep slopes which facilitate the run off of rain water.

World For. Publ. Y. 35 MAIRE, R. 1952-1962. Flore de l'Africa du Nord. Lechevalier. Paris. MINISTERIO ESPANOL DE AGRICULTURA. 1962. Los grupos principales de suelos de la Espana Peninsular. MONSERRAT RECODER, P. 1961. Contribuci6n al conocimiento de los Pastos Almerienses. Instituto de aclimataci6n. Almeria. NEUMANN, H. 1960. El cEma del Sudeste de Espana. Instituto Juan Sebastian Elcano. Madrid. Rurz DE LA TORRE, J. 1966. ) Karst. en el Sureste de Espana. Malaga. ). SCHMID, E. 1956. Die Vegetationsgiirtel der Iberisch-Berberischen Gebirge.

More arid, towards the South and consequently ever more unfavourable to vegetation, particularly young trees. The difficulties encountered by these foresters are therefore everywhere of the same nature and there is only a difference of degree of difficulties between the Northern provinces and the Southern ones. But everywhere towards the South one comes to the absolute minimum, below which no afforestation is conceivable. In order to methodically channel their approach to the whole problem and to perfect and appropriate the techniques to this common denominator and to its latitudinal gradient, North African foresters have naturally been induced to classify the climates under which they worked or to use established classifications.

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