Download Drought in Arid and Semi-Arid Regions: A Multi-Disciplinary by Kurt Schwabe, Jose Albiac, Jeffery D. Connor, Rashid M. PDF

By Kurt Schwabe, Jose Albiac, Jeffery D. Connor, Rashid M. Hassan, Liliana Meza González

Offering a cross-country exam and comparability of drought knowledge and event, this e-book indicates how scientists, water managers, and coverage makers technique drought and water shortage in arid and semi-arid areas of Spain, Mexico, Australia, South Africa and the United States.

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Extra resources for Drought in Arid and Semi-Arid Regions: A Multi-Disciplinary and Cross-Country Perspective

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Lettuce, broccoli, onion, all of which are short-season and cool-weather tolerant). An alternative would be to develop a dry land production strategy that uses stored soil water and rainfall to produce a crop. This is typically done with a grain crop planted in the early winter that relies on winter rain for production. A decision can be made in the spring to provide irrigation to complete the crop or to accept yield losses and let the crop mature on existing soil water. This provides a moneymaking opportunity with little expenditure.

In regions with winter rainfall, soil and crop residue management will be important to improve infiltration and provide soil water storage. Timeliness of operation, ensuring evenness of establishment, and nutrient management will contribute to improved yield potential. Water supply management to reduce evaporation and surface runoff, and deep percolation losses is another important consideration. Irrigation water management depends on the crop selection, the irrigation system, and the production goals.

Measures and policies adopted prior to 1980 when AD was managed as an abnormal disaster event requiring emergency government assistance (which mainly covered the livestock sub-sector in areas declared as disaster drought areas) are reviewed. The chapter identifies shortcomings of this reactive approach and the difficulties encountered that rendered this strategy ineffective in retarding the degradation of key resources, including land used for grazing and water. A comprehensive review is then provided of the important policy improvements and measures introduced in the 1980s to discourage overstocking and to reduce the pressure on the natural resource base, particularly land used for grazing and water resources.

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