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<br />STATE 0~= COLOR~~O <br />DIVISION OF MINERALS AND GEOLOGY <br />DeNd+lmenl a( Natural Resources <br />1313 Sherman St.. Room 215 <br />Denver, Coloracb 80203 DIVISION O F <br />Phone: 13031866-3567 MINERAL S <br />FA%: (3031 8328105 & <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br /> <br />bill Owens <br />INTERNAL, MEMO °°'°`°°` <br />Crep E. Walther <br />E>eculiv~ Ducaur <br />M¢hael B. Long <br />Drvisiun DiRClor <br />TO: Byron Walker 29 Nov 2(ll)l <br />Ft•om: Jim Burnel~~ <br />Subj: 'Tolerance levels of plants to SAR (Sodium Absorption Ratioj in soils <br />Byron; cone information on the interpretation of the Sodium Absarption Ratio (SAR}: <br />7'he u5 Suii Laboratory has derived an empirical formula for converting SARto the <br />F~x::hangeable Sodium Percentage (ESP) of a soil, and i.n turn use these ESF.vulues in a <br />gi;~era! ove«~iew for plant tolerance. <br />ESP= 1,95 SAR.+ 1.8 <br />Sa. for cur purposes, au <br />SAk of .l = ESP of 3.75 <br />SAR of 10 = ESP of 2 L3 <br />SAR of 18 = ESP of 36.9 <br />SAR of 24.3 = ESP of 49.2 <br />