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It has long been maintained by irrigation experts in the United States that irrigation should be started earlier in the Southwestern United States than in the Northwestern states. Fortier (5) noted in 1923 that where either the elevation or the latitude was greater, the climate was usually cooler, the growing season for tree fruits shorter, and the irrigation requirement less. The same conclusion was reached later by Thome and Petersen (8) with respect to crops in general. In Canada, Baier and Russelo (2) used a fixed growing season of 153 days (May 1 to September 30) for use of past meteorological records to estimate probable future irrigation requirements. This 153-day growing season has since been compared by Sly and Baier (7) with a growing season limited in spring and fall by a temperature of 5.0
estimation of irrigation requirement using different criteria for determining the growing season
Wilcox, J.C. and W.K. Sly 1975. ESTIMATION OF IRRIGATION REQUIREMENT USING DIFFERENT CRITERIA FOR DETERMINING THE GROWING SEASON. Canadian Agricultural Engineering 17(2):114-118.
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