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n <br />-e1 <br />considered non-sodic if SAR values are below 13. The SAR <br />equation determines the ratio of sodium to calcium and magnesium. <br />SAR values for topsoil and refuse are well within plant tolerance <br />ranges. New refuse had the highest SAR's (1.58) and old refuse <br />had the lowest (0.19). <br />Calcium content also showed wide sample variation from 13.0 <br />to 175.0 meq/100g. The old refuse material contained the highest <br />average amount of calcium. However, the average was influenced <br />by one sample which contained 94.8 and 175.0 meq/100g of calcium. <br />Otherwise, calcium content of refuse material was within general <br />ranges found in topsoil. <br /> <br />Magnesium content of the topsoil was significantly higher <br />than the new refuse and also higher than the old refuse. <br />Embleton (1966) indicates that soils which contain less than 50 <br />ppm magnesium are probably deficient, Values for both topsoil and <br />refuse ranged from 69.3 ppm (.57 meq/100g) to 970 ppm (7.98 <br />meq/100g) and are in sufficient quantities for plant growth. <br />Boron toxicity is commonly associated with coarse soil <br />texture and increasing pH from 7 to 9 (Peterson and Newman, <br />1976). Samples showed a wide range of variation in both topsoil <br />and refuse content of boron (18.4 to 224.4 ppm). Old refuse <br />material had a greater mean boron content than topsoil or new <br />~~ <br />2-7 <br />