Rapidly shrinking natural resource base due to increasing population and competition for water among all other sectors is increasing the damage to ecological foundation of agriculture through soil degradation by erosion, water logging, salinization and siltation of reservoirs. There is a wide gap between creation and re-utilization of water both in qualitative and quantitative aspects. Rapid urbanization, industrialization and population explosion coupled with global climatic changes and over exploitation of groundwater are the main reasons.

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