Abstract
Abstract ‘Kennebec’ and ‘Irish Cobbler’ potatoes were irrigated when 1/3 or 2/3 of available soil moisture was depleted in a 3-year study. Control plots were not irrigated. Soil temperatures at 4-inch depth were equal in irrigated and non-irrigated soils one year and 2° and 7°F (1.1° and 3.9°C) cooler in irrigated soils the other 2 seasons. U.S. No. 1 yield of ‘Kennebec’ was greater with irrigation when 1/3 available moisture was depleted in a low rainfall and high temperature season. ‘Irish Cobbler’, the same season, produced greatest yield by irrigating when 2/3 available moisture was depleted. Number of U.S. No. 1 tubers differed between seasons and followed yield trends. Specific gravity and number and weight of tubers were all inversely related to air and soil temperatures. Air and soil temperatures apparently are the major factors affecting potato yield under Kansas growing conditions.
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