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n <br />u <br />sodium adsorption ratio (SAR); and electrical conductivity (EC). The results <br />of che,nical and physical analyses era in Illustration D. <br />',caste areas 1 through 6, represented by holes R1 through Rb, have predominately <br />suitable material throughout. Hole R9A, r=presenting waste areas 7, 8, and 9, <br />has two marginally unsuitable strata due to hign SAR and clay percentage values. <br />Further sa,npling will be need ad to assess the severity of the problem in these <br />threw areas. <br />~~~ <br />Important physical and chemical parameters are individually discussed below. <br />Tha discussion focuses on parameters having marginal values. <br />• Sodium Adsorption Ratio <br />Che most pervasive parameter affecting suitability is the sodiwn adsorption ratio <br />(SAR). High values (greater than 15) indicate relatively high concentration of <br />sodium ions which are toxic to plants when excessive 1=vale exist. SAR values <br />in the range of 10 to 15 are marginally suitable depending on placement and soil <br />texture. Values in this range can inhibit plant establish.nent if placed on or <br />very near the surface. Heavy or clayey textures often accentuate the proble,n <br />by providing high capillarity, swelling of colloids thereby slowing drainage, <br />and stronger adsorption of sodium ions. <br />• <br />II.I-22 <br />