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<br />I <br />I <br /> <br />I <br /> <br />1846 <br />sensitive crops. Soil permeability may be impacted by adverse <br />sodium concentrations or low irrigation water salinity. Soil <br />permeability problems may occur with irrigation from Piedra River/ <br />Vallecito Creek, San Juan and Los Pinos River waters because of low <br /> <br />salinity. Irrigation with Mancos River water may also result in <br /> <br />soil permability problems because of its sodium content. Toxic ion <br /> <br />effects may result from irrigation with Mancos River water which has <br />a sodium concentration sufficiently high to potentially cause crop <br />root and foliage toxicity and subsequent yield reduction in <br /> <br />sensitive crops. Potential irrigation water sources for the Ute <br /> <br />Indian reservations are generally excellent with the exception of La <br /> <br />Plata and Mancos River waters which may reduce the potential yields <br /> <br />of salt sensitive crops. <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />1.3.3 Soil Suitability <br />An irrigation suitability land classification study was performed by <br />the firm of Stoneman- Landers, Inc. on Ute Indian Reservation lands. <br />Irrigation suitability land classification standards were developed <br />and the mapping was performed using Bureau of Indian Affairs (BIA) <br />land classification mapping standards. Reservation lands were <br />placed into either one of four arable land classes or one non-arable <br />'land class. The summary of the irrigation suitability land <br />classification study performed by Stoneman & Landers, Inc. is <br />presented on Table 1.2. The land classification analysis provides <br />the basis for the evaluation of project soil characteristics in <br />relation to crop suitability and production requirements. The <br /> <br />I <br />I <br />I <br /> <br />1- 8 <br />