By I. Arnon
All through historical past, guy has, via over-use, constantly lowered the efficient ability of dry lands. This degradation of one-third of the land sector of the globe is, regrettably, expanding. lately, global curiosity has grew to become to the issues of toxins of our surroundings and the approaching nutrients scarcity as global inhabitants grows explosively. hence the eye of foreign and different agricultural bodies has grew to become to the necessity for conserving and constructing extra successfully the rural power of those components. This ebook offers a entire overview of current wisdom of. Read more...
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Additional resources for Agriculture in Dry Lands: Principles and Practice
Evaporation causes the rapid loss of water from a moist soil surface; as a result, the upper soil layer, to a depth of 10-12 cm dries out very rapidly after a rain. This means, in practice, that rainfall that is insufficient to wet the soil beyond the 1012 cm layer, will generally be of little use to crops. Effective rainfall is the minimum amount of rainfall, occurring on a single occa sion, that ensures some water storage under favourable soil conditions. The amount needed for this has been estimated as 15-20 mm for a single rainfall.
Press, Stanford, CA. J. , 1990. Agroclimatic approaches for improving agricultural productivity in semiarid tropics. Adv. , 13: 273-3Ό9. F. , 1967. Use of modern equipment and techniques in the planning and development of water resources. In: Water for Peace, Vol. 8. S. Govern. Printing Office, Washington, DC. Koppen, W. , 1936. Handbuch der Klimatologie. Gebr. Borntraeger, Berlin. G. 1976. World Climatology: An Environmental Approach. Arnold, London. , 1959. Climatology of arid lands. Arid Lands Colloquia, 1958-59: 3-13.
Summer temperatures are high; winters, whilst cold, have temperatures that are somewhat milder than might be expected at this latitude. A dominant climatic feature is the biannual rainfall variation: one maximum occurring in winter, the second during the warm season. The biannual variation in rainfall is most marked in central Arizona, with a decrease in amplitude in all directions from this centre (Trewartha, 1961). The Intermountain Region is divided into two main sectors: the northern part is a cool desert (the so-called 'sage-brush zone') and the southern part is a warm desert (the creosote-brush zone).
Agriculture in Dry Lands: Principles and Practice by I. Arnon