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註釋Introductory overview: soil, water and civilization; Soil and water as critical factors in the history of the fertile crescent; The future role of irrigation in meeting the world's food supply; Is irrigated agriculture sustainable?; Global overview of soil erosion; Land degradation in the world's arid zones; Agriculture in a changing global environment; Role of geopurification in the future water management; Soil physics and groundwater quality; International agricultural research and development - future challenges.