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According the RTI, during the spring and summer growing season for wheat planted in the fall <br />(winter wheat), the spectral signature is essentially the same as wheat planted in the spring <br />(spring wheat). For the spring and summer portion of the growing season for "winter wheat", <br />TR-21 crop coefficients and growing season starting temperature are identical to small grains. <br />Table 5 shows the growing season and average ET for winter wheat and spring grain at the <br />Byers and Longmont climate stations. The spring portion of the growing season is reported <br />separately from the winter portion for the Byers area. As shown, the spring growing season is <br />the same for winter wheat and for spring grains, consistent with TR-21 recommendations. The <br />ET is approximately 4-inches greater for winter wheat, accounting for the fall germination <br />period. Because the ET is much higher at both climate stations for winter wheat than for spring <br />grains, we do not recommend including winter wheat in the small grains category. <br />Table 5 <br />Cro Information from the Colorado Irri ation Guide <br /> <br />Crop <br />Station <br />Growing Season <br />Growing <br />Days Avg <br />ET <br />(inches) <br />Wheat <br />Winter Byers 9/9 <br />4/1 10/25 <br />7/15 46 <br />105 16.42 <br /> Longmont 8/15 7/15 334 18.46 <br />Grain, Byers 4/1 7/20 110 12.49 <br />Spring Longmont 4/1 7/15 105 11.36 <br />Results <br />Table 6 shows the recommended SPDSS crop types to be categorized in the South Platte River <br />basin during the irrigated acreage assessment and subsequent consumptive use modeling. Note <br />that potatoes represent less than one percent of crops grown in any county and for the entire <br />South Platte basin and we believe it will be difficult to distinguish them separately. Therefore, if <br />parcels growing potatoes are identified, they should be included in the vegetables category. Note <br />that with the exception of Sunflowers, the identified crops have been reported in the basin during <br />the entire 1950 through current year study period. CASS shows that sunflowers became a <br />significant crop around 1990. <br />Page 9 of 13 <br />