Desertification is a specific phenomenon of arid, semiarid and day sub humid.
Man, by over grazing, bush and shrub picking and wrong irrigation, land use disregarding the land capability, irrigular transformation of range lands to rain-fed farming, non observance of soil conservation in cultivation practices, ets, altogheter create conditions which in the last instance land to the reduction of biological production and the expansion of desert and arid lands. At the present the area of the country's deserts and sandy soils is estimated to be 34 million hectars, and that of the poor and desertified rangelands which 12 million hectars correspond to the sandy, soils 5 million of the same shifting sand dunes. Historical evidences and works remained from the ancient time testify the fact that these regions were covered by desert forests and plants, which were annihilated because of the wrong and excessive exploitation, the result of which has been the diminution of the vegetation resources and the conversion of the lands into deserts.