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Cover: Sprinkler irrigation on the Snake River Plain near Burley, southern Idaho, looking toward Mt. Harrison. About two-thirds of irrigated land in the Pacific Northwest is under sprinkler irrigation (1.7 million ha). Loss of phosphorus in surface runoff from such systems is poorly understood, but may be predicted from a single agronomic soil test. See Turner et al., "Phosphorus in Surface Runoff from Calcareous Arable Soils of the Semiarid Western United Statest, p. 1814-1821. Photo by Dr. Dennis Kinkaid.