By Professor Dr. A. De Philippis (auth.), R. N. Kaul (eds.)
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Cupressus have, however, been used in windbreak plantations because of their resistance to winds and for their decorative effects; among them the most frequently used is C. arizonica. The trials with Eucalyptus have been spread over the last ten years. These began as acclimatisation trials without any special preparation of the land and have continued on wider plantations. Opuntia inermis (Opuntia ficus indica) (Chumbera) was used towards 1955, with the object of quickly covering erodable lands for obtaining an emergency feed for livestock from its spineless leaves and especially for 30 the production of its fruit whose sugary pulp had been successfully tried for obtaining fodder for cows and pigs.
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.
The olive-groves are situated by choice on its northern limits. There are also small areas given over to the cultivation of fruit trees of dry areas, in the district that lies between Murcia and the Mar Menor. The cultivated pastures are limited to the litho sol of the elevated parts of the Sierras. Considerable areas of woodlands and limited areas of thickets also exist. 'Guadix' Zone: Has irrigated lands in the plains of its rivers, but over the whole zone the uncultivated pastures predominate alongwith dry herbaceous cultivation.
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