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be a sufficient amount to meet the requirements for native <br />species. pH is not a factor in R availability in the range of <br />pH's that were common to the samples. <br />2.2 Salts <br />As measured by EC, calcium, sodium, magnesium, boron, <br />chlorine, and SAR in the refuse material, all salts appear to be <br />within normal plant tolerance ranges. EC values for all refuse <br />material ranged from .06 to 3.0. From an aricultural standpoint, <br />soil is not considered saline if the EC value is below 4.0. Old <br />refuse material in the 15-30 ctn depth had a significantly greater <br />EC value than the topsoil, although, values are still within <br />• normal plant tolerance range. Older refuse material also had a <br />significantly greater EC value (1.23) than the new refuse (0.71). <br />Higher EC values for the older refuse material may be due to <br />capillary rise of salts over time. <br />Sodium content of the topsoil and new refuse material showed <br />a high amount of variation between the different mines. New. <br />refuse contained the greatest amount of sodium (X=1.66 meq/100g) <br />and the older refuse material contained the least (X=.28 meq/- <br />100g). Plant tolorance for sodium is indicated by the sodium <br />absorption ratio (SAR) values. Determination of sodicity in <br />soils of refuse is arbitrarily based on SAR. Soils are generally <br /> <br />2-6 <br />