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Figure <br />18. SAR-Conductivity Classification of Ground Water <br />Irrigation Suitability, Nuc]a Mine, Montrose County, Colorado <br />Specific t:onduuntt, in pSlcm a1 ZS°C <br />100 Z 3 1 5 6 7 8 1000 Z 7 1 5000 <br />~xpl~ana~ti~on <br />W'1 e] 1 GW-N1 <br />2 Well GW-N3 <br />3 Well GW-N4 <br />4 Wel! GW-N5 <br />5 We I 1 GW- N6 <br />6 Well GW-N9 <br />7 Spoil Spring #1 <br />8 Hi ghwa 11 Spring <br />*Mean Values for <br />the Period of Record <br />4 <br />I <br />5, 6, 7 <br />• <br />Sel,nitY MSer0 <br />CONOUCTIVIiY <br />C1 Low-salinity water: Can be used for irrigation with most crops on <br />most soils with little likelihood that soil salinity will develop. <br />C2 Medium-saiinity water: Can be used if a moderate amount of <br />leaching occurs. <br />C3 High-salinity water: Cannot be used on soils with restricted drainage. <br />With adequate drainage, special management for salinity control may <br />be required and plants with good salt tolerance should be selected. <br />C4 Very high salinity water: Is not suitable for irrigation under <br />ordinary conditions. <br />SODIUM <br />S1 Low-sodium water: Can be used for irrigation on almost all soils <br />with little danger of the development of harmful levels of <br />exchangeable sodium. <br />52 Medium-sodium water: Will present an appreciable sodium hazard in <br />fine-textured soils having a high cation-exchange capacity, <br />especially under low-leaching conditions. <br />. 53 High-sodium water: May produce harmful levels of exchangeable <br />sodium in most soils and will require special soil management - <br />good drainage, high leaching and organic matter additions. <br />S4 Very high sodium water: Is generally unsatisfactory for irrigation <br />purposes except at ]ow and perhaps medium salinity. <br />95 <br />