Agriculture in Dry Lands: Principles and Practice by I. Arnon

By I. Arnon

All through historical past, guy has, by means of over-use, continuously diminished the efficient means of dry lands. This degradation of one-third of the land quarter of the globe is, regrettably, expanding. in recent times, international curiosity has became to the issues of toxins of our environment and the upcoming nutrients scarcity as global inhabitants grows explosively. therefore the eye of overseas and different agricultural bodies Read more...

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As the air moves from the subtropical belt towards the Equator, its tempera­ ture rises and its relative humidity remains low. The skies are clear, the weather is warm, and only light rainfall occurs. Wherever mountain ranges force the trade winds to rise, rainfall occurs on the windward side, whilst the leeside remains arid. As Causes of aridity 33 the trades approach the Equator they become progressively more humid and unsta­ ble; however, they do not actually reach the Equator, but rise at some distance from it.

Between these two regions lies a zone without a well-defined rainy season; the occasional precipitation can occur in any month of the year (Walter, 1962). Groundwater is the major, and often the only, source of water in arid Australia; large reserves of groundwater occur in sedimentary basins. 74 million km2 (Williams and Lazarides, 1985). There is, as yet, no evidence of erosion in the Australian desert or of its expansion. ). Around the central desert core of Australia, with the exception of parts of the west and south coasts, is a fairly broad ring of semi-arid lands with erratic summer rainfall and tropical temperatures, which separates the desert from the humid climates on the margin of the continent.

1985. Indian Subcontinent. R. K. Northington (Editors), Plant Resources of Arid and Semiarid Lands. A Global Perspective. Academic Press, New York, pp. 69-128. Dancette, C , 1980. Water requirements and adaptations to the rainy season of millet in Senegal. In: Proc. Int. Conf. on Agroclimatological Research. Needs of the Semi-Ar id Tropics. , India, pp. 106-120. , 1977. Groundwater resources. S. Mann (Editor), Desert Ecosystem and its Improve­ ment. Centr. , Jodhpur, pp. 26-30. De Jong, E. , 1983.

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