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" Most new lands brought under cultivation are marginal and ecologically fragile and cannot make up for the land being removed from cultivation each year because of urbanization and land degradation. The... "
Rural Well-being: From Vision to Action : Proceedings of the Fourth Annual ... - Страница 8
под редакцията на - 1997 - 433 страници
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Rural Development: From Vision to Action

Alex F. McCalla, Wendy S. Ayres - 1997 - 157 страници
...the twentieth century. Why? Because new lands are marginal and environmentally sensitive and may not make up for the land being removed from cultivation each year because of urbanization and environmental degradation. New irrigation projects are increasingly expensive and subject to much stricter...

Food Security and Nutrition: The Global Challenge

Uwe Kracht, Manfred Schulz - 1999 - 692 страници
...and more irrigation, because land and water are becoming increasingly scarce (Feder and Keck 1994). Most new lands brought under cultivation are marginal...to be reallocated for municipal and industrial use. The challenge is worldwide, and both technological and political in nature. The technological aspect...
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The Challenge of Rural Development in the EU Accession ..., Томове 23–504

Csaba Csáki, Zvi Lerman - 2001 - 210 страници
...irrigation, because land and water are becoming increasingly scarce (Mitchell, Ingco, and Duncan). Many new lands brought under cultivation are marginal and...to be reallocated for municipal and industrial use. Thus expansion of irrigation or increased intensification through irrigation are not viewed as major...

Managing for Healthy Ecosystems

David J. Rapport, Bill L. Lasley, Dennis E. Rolston, N. Ole Nielsen, Calvin O. Qualset, Ardeshir B. Damania - 2002 - 1552 страници
...becoming increasingly scarce (Crosson and Anderson, 1992; Mitchell et al., 1997; McCalla, 1998). Many new lands brought under cultivation are marginal and...ecologically fragile and cannot make up for the land removed from cultivation each year because of urbanization and land degradation. Sources of water that...
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