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7 The lower limit of 8 is recommended by Barrett (1980), DEQ (1985), <br />• USDA (1983), OSM (1985), Schafer (1979, 1980), and BLM (1977). Both <br /> DSL (1983) and SEAid (1979) indicate lower limits of 4 and 6 niay be <br /> essential for certain plant species. The upper limit of 12 is <br /> proposed by DEQ (1985) and OSDI (1985), whereas USDA (1983) and BLM <br /> (1977) recommend 16, SEAPd proposes 9, while CSL (1983) and Schafer <br /> (1979, 1980) specify 8. <br />8 These values are recommended by OSi~I (1985), DSL (1983), and DEQ (1985) <br /> with the exception that DEQ (1983) proposes an upper limit of 80. <br />9 S ecific level de ends u on cla mineralo <br />p p p y gy, soil texture and <br /> saturation percentage according to Dollhopf et al. (1983) and DSL <br /> (1983). <br />10 These values are similar to those recommended by Barrett (1980), DSL <br /> (1983), DEQ (1985), USDA (1983), OSM (1985), Schafer (1919, 1980), and <br /> BLM (1977). <br />11 proposed by OSI+I (1985) . <br />12 These values are similar to those recommended by Barrett (1980), DSL <br /> (1983), Schafer (1979, 1980), OSM (1985), and BLM (1977). SEAM (1979) <br /> proposes 12. <br />13 proposed by OSM (1985). <br />• 14 This value is supported by DEQ (1985) and Smith (1974). Units are <br /> tons of CaC03 required per acre furrow slice. <br />1'' Confirmed by Barth (1986). These iron levels may not be toxic but niay <br /> cause significant nutrient imbalance. <br />16 This value is supported by Sutton et al. {1981). Schafer (1980) <br /> proposes 60. <br />17 The actual maximum acceptable molybdenum concentration will depend <br /> upon the plant species proposed in the revzgetation plan seed mix and <br /> their potential for molybdenum accumulation. The depth of replaced <br /> topsoil must also be evaluated. <br />18 Recommended by DSL (1983). <br />19 Presented by Peabody (1985) from data extrapolated from Newnan and <br /> t4unshower (1983). A value of 2 assumes 100 legumes with 2 feet of <br /> topsoil while a value of 8 assumes 100 grasses with Z feet of <br /> topsoi 1 . An upper 1 inii t of 1.0 i s proposed by DSL (1983) and GEQ <br /> (1985). A limit of 0.85 is proposed by Newnan and Munshower (1483) <br /> fcr a site with no topsoil. <br />20 This value is supported by Barth et al. (1931). <br />. 21 <br />pported by Barth et al. (1981) and Sutton et al. <br />This value is su <br /> (1981). <br /> 6-44 Revised 11/01/86 <br />