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<br />I l 2468 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1.2.2 Farmington Experiment Station <br />New Mexico State University and New Mexico Water Resources Research <br /> <br />Institute (WRRI) have conducted a number of irrigation and water use <br /> <br />related research projects at the San Juan Branch Agricultural <br /> <br />Station in Farmington. Two major reports have been completed <br /> <br />concerning consumptive use in that area. <br /> <br />"Consumptive Use and Yields of Crops in New Mexico" was published in <br /> <br />1979 and gives a water use production function for the state and <br /> <br />identifies water requirements for five areas. Their results are <br /> <br />supportive of the Blaney-Criddle formula as a method to estimate ET <br />under average conditions. (Note Sammis' 'et al used the original <br />Blaney-Criddle formula with crop growth stage coefficients <br />developed for New Mexico.) There appears to be a more direct and <br /> <br />stable correlation between yield and consumptive use of alfalfa than <br /> <br />for other crops. The use of locally calibrated crop production <br />functions having high coefficients of determination appears to be a <br />good method of estimating consumptive use provided reasonable <br /> <br />estimates of yield can be determined for the area. A single water <br /> <br />use production function for alfalfa at 0 percent moisture is <br /> <br />recommended state wide. It has the form: <br /> <br />Y = -.896 + .147 ET (t/ac/in) <br /> <br />(3 ) <br /> <br />Converted to field dry weight at 12 percent moisture the equation has <br />the form: <br /> <br />Y = -1.00 + .165 ET'(t/ac/in) <br /> <br />(4) <br /> <br />A second WRRI research report was published in 1983 titled "Water Use <br /> <br />1- 5 <br />