Download e-book for iPad: Arid Land Irrigation in Developing Countries. Environmental by Barton E. Worthington

By Barton E. Worthington

ISBN-10: 0080215882

ISBN-13: 9780080215884

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Extra resources for Arid Land Irrigation in Developing Countries. Environmental Problems and Effects

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The biological components are altered in terms of species diversity, numbers of organ­ isms, and the stability of their inter-relationships. Aquatic organisms are most affected, namely, algae, vascular hydrophytes, aquatic invertebrates, insects with an aquatic stage in their life cycle, and fish. ) and in water (fisheries and aquacultures), irrigation promotes radical changes in human population. These com­ prise settlement of nomadic indigenous population, re-location of farming population from other territory, and other social interactions.

Various drugs used in schistosomiasis treatment are expensive and have serious side-effects. If nothing is done to prevent transmission, reinfection recurs readily. In lands formerly free from schistosomiasis the diseases appear and quickly reach epidemic proportions by introduction of snails into a new irrigation system or by introduction of the disease by immigration of infected people. In arid lands where schistosomiasis existed at a relatively modest prevalence of, say, 10-15 percent of the population, and with a correspondingly low intensity (and therefore gravity) of infection, it is common to see prevalence grow quickly to 80-90 percent.

2) For teaching and training. Outdoor education whether of young or of adults is of growing importance in all countries, and this should be especially so among farm­ ing communities whose work consists of cooperating with natural processes. (3) For recreation and cultural reasons. Particularly within reach of towns or large villages, the rise in living standards leads to demand for a variety of different types of recreational areas. This may include open spaces for group activities as well as quiet, personalized areas for walking and observing the landscape.

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Arid Land Irrigation in Developing Countries. Environmental Problems and Effects by Barton E. Worthington

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