Abstract
Many factors contribute to the decisions that impact the amount of water furrow irrigators apply annually. Precipitation received during the irrigation season plays an important role in determining seasonal irrigation requirements. The general characterization of the geography in which an irrigator operates may also influence annual irrigation amounts. Records from furrow irrigation systems were analyzed for 312 site-years of studies in the central great plains (USA). The effect of in-season precipitation and geographic characteristics (upland or river valley) were estimated. Furrow irrigators respond to high rainfall years by applying less irrigation water, but do not change water application between low and medium rainfall years. The general geographic class in which an irrigator is located does not appear to affect seasonal irrigation amounts.
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