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Accepted for publication November 24, 1961.
Synopsis: Yield depressions of 10 to 35% in irrigated spring wheat resulted from severe soil moisture stress. Reductions were greatest when stress was imposed during or after heading. Grain yield responses to nitrogen were due largely to increased head population. There appears to be no benefit in the irrigation of spring wheat prior to the boot stage unless moisture stress as indicated by wilting or curling of leaves is observed.
2 Soil Scientists, Northwest and Northern Plains Branches, Soil and Water Conservation Research Division, ARS, USDA, Boise, Idaho, and Mitchell, Nebraska; formerly at Irrigation Experiment Station, Prosser, Washington.
Received for publication May 11, 1961. Accepted for publication November 24, 1961.
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