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Enhancing Water Use Efficiency in Irrigated Agriculture

USDA-ARS, Conserv. and Production Res. Lab., P.O. Drawer 10, Bushland, TX 79012

View larger version (26K): [in a new window]   Fig. 1. Illustration of the growth of the world's population, irrigated area, and irrigated land per person. Data were taken from several sources, including Rhoades (1997), Ghassemi et al. (1995), Worldwatch Institute (1999), and Food and Agriculture Organization of the United Nations [FAOSTAT] (1999)

View larger version (23K): [in a new window]   Fig. 2. Trend in U.S. irrigated areas since 1969 (ERS, 1997)

View larger version (42K): [in a new window]   Fig. 3. Changes in U.S. irrigated land since the 1992 agricultural census, indicating a net increase of 2.89 Mha (USDC, 1999). Illustration was supplied by the USDA-NASS, Washington, DC

View larger version (29K): [in a new window]   Fig. 4. Planted and irrigated cropland in the USA and the percent of cropland that was irrigated since 1964 (USDC, 1999)

View larger version (36K): [in a new window]   Fig. 5. Change in the percent of U.S. cropland and crop production that is irrigated (USDC, 1999)

View larger version (29K): [in a new window]   Fig. 6. Irrigation systems in use in the USA in 1979 and 1994

View larger version (18K): [in a new window]   Fig. 7. Percentage changes in irrigation systems in the USA from 1979 to 1994 (ERS, 1997)

View larger version (22K): [in a new window]   Fig. 8. Relationship between winter wheat yield and water use efficiency (WUE) at Bushland, TX (Musick et al., 1994)