By I. Arnon
All through background, guy has, by way of over-use, continually diminished the effective capability of dry lands. This degradation of one-third of the land zone of the globe is, regrettably, expanding. lately, international curiosity has became to the issues of toxins of our environment and the approaching foodstuff scarcity as global inhabitants grows explosively. hence the eye of overseas and different agricultural bodies has became to the necessity for protecting and constructing extra successfully the rural power of those components. This publication presents a finished overview of current wisdom of. Read more...
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Additional info for Agriculture in Dry Lands: Principles and Practice
Reproduced by permission of UNESCO. rainfall may occur for a few days during the cooler period of the retracting south west monsoon, and, occasionally, during the rest of the year. Once in 10 years, the expected annual rainfall of the arid zone of north-west India can be less than 200 mm. In some areas it may be less than 60 mm. Air humidity. Average relative air humidity values are more or less similar in the two regions. Mean annual evaporation is 200-300 mm in the arid regions, and 200350 mm in the semi-arid regions.
Winters are cold, with frequent night frosts. Grazing is the predominant land use (Walter, 1962). To the north, the central plateau descends into the Kalahari sand veld. Eurasia Eastern Mediterranean region This region, formerly known as the Levant, comprises Syria, Lebanon, Israel, and Jordan. Along the sea coast, the climate is typically Mediterranean, with a a regular pattern of winter rains (late October to May), and an absolute summer drought. Eastwards, mountain ranges parallel to the coast partially prevent the moisture laden winds which originate in the Atlantic, from spreading inland; therefore rainfall declines rapidly, from an annual average of over 500 mm, to less than 200 mm inland, over relatively short distances.
The principal arid regions of the world occur where one or both of these factors operate: (1) In the flat trade-wind deserts of Africa (Sahara), Arabia, and Australia. The primary reason for the aridity of these regions is the chronic lack of lifting processes. g. isolated mountains, such as the Atlas of North Africa, which, by causing orographic lifting, have more precipitation than the surrounding plains (McDonald, 1959). The reasons for the scarcity of dynamic lifting processes in these low-latitude arid regions are: (a) They are too far equatorward to be strongly influenced by the extratropical wave cyclones that increase precipitation in the regions lying polewards of the deserts.
Agriculture in Dry Lands: Principles and Practice by I. Arnon