Challenging threat for the world is the change in the environment. Future trends of climate shows that if there will be increase in surface temperature and evapotranspiration (ET0), so it affects the hydrological cycle i.e. water availability, which is the most important element of agriculture (Naheed and Rasul, 2000). As the global demand of water has increased, whereas the available amount of water is limited, it is estimated that about 3.5 billion people will face severe water shortage by the year 2025 (FAO, 2001). The consumption of water for non-irrigation purpose increases to 62% from 1995-2025 (IWMI, 2002). According to the scenario, future conflicts among the nation will be on ease access to water (PSF, 1999). Pakistan has a rich and vast natural resource base, covering various ecological and climatic zones; hence the country has great potential for producing all types of food commodities. Agriculture has an important direct and indirect role in generating economic growth. The importance of agriculture to the economy is seen in three ways: first, it provides exchange earnings; and third, it provides a market for industrial goods. It is the second largest sector, accounting for over 21 percent of GDP, and remains by far the largest employer, absorbing …show more content…
This can be achieved because available information’s indicate that there is a wide gap between actual and attainable crop water productivity, especially in Pakistan. With water shortages constraining food production growth, our agriculture sector the world needs and effort to improve water productivity similar to the one that nearly tripled land productivity over the last-century by green