Influence of Irrigation on Severity of Potato Early Dying and Tuber Yield

The effects of three different irrigation regimes on potato early dying and associated yield loss were assessed in potato cultivar Russet Burbank grown in field microplots at two environmentally distinct locations in Oregon. Fumigated soil was either noninfested or infested with 5, 10, or 25 colony-forming units of Verticillium dahliae per gram of soil (cfu). Microplots were drip-irrigated to provide deficit, moderate, or excessive amounts of irrigation water. Moderate irrigation was approximately equal to estimated consumptive use (ECU); the deficit and excessive regimes were 50 and 150% of ECU in 1987 and 50 and 200% of ECU in 1988, respectively []