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<br />003102 <br /> <br />. <br /> <br />. <br /> <br />- 4 - <br /> <br />of 5,000 feet show that saltcedar has produced an abundance <br /> <br />of viable seed each year and new seedling infestations have <br /> <br />become established each summer on wet sand and silt bars along <br /> <br />streams and around reservoirs. Short growing seasons and win- <br /> <br /> <br />terkill have retarded growth of saltcedar but the species <br /> <br /> <br />appear sufficiently well adapted to comprise a potential seri- <br /> <br /> <br />ous weed pest on irrigation systems and streams in Northern <br />States and at high altitudes. <br /> <br />Economic evaluation of any program inVOlving eradication, <br /> <br />control or replacement vegetation will necessarily be based on <br /> <br />the amount of water saved or converted to use by beneficial <br /> <br />types of vegetation. <br /> <br />At present evapotranspiration of phreatophytes in Colo- <br />rado can only be estimated by empirical formulas used to trans- <br /> <br />fer data from outside areas. At best, values obtained are <br /> <br />only rough estimates. Differences in temperature, elevation, <br /> <br />length of frost-free period, soils, depths to water, quality <br /> <br />of water, and the kind and density of growths are factors <br /> <br />affecting water use that vary from one environment to another. <br /> <br /> <br />Theae factors apply to each type of phreatophyte found in Colo- <br /> <br /> <br />rado, not only to the nonbeneficial but to the beneficial types. <br /> <br /> <br />For example, saltgrass in the Arkansas Valley is being used <br /> <br />.~. ~ <br />