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• <br /> <br />WDEO (1985). A limit of 0.85 is proposed by Neuman and Munshower (1983) for a site with <br />no topsoil. <br />21. Proposed by MDSL (1983) and WDEO (1985). <br />22. Recommended by USDI-OSMRE (1985a); Schafer (1979, 1980) proposed 2.0. <br />23. Proposed by WDEO (1985). The lower limit proposed by Sutton et al. (1981). <br />24. Recommended by Singleton and Barker (1980). <br />25. This value proposed by Barth et al. (1981). <br />26. This value is supported by WDEO (1985), Smith (1974), and Sutton et al. (1981). Units <br />are tons of CaCO3 equivalent/1000 tons. <br />27. These values supported by Sutton et al. (1981) and Lindsay and Novel (1978). Schafer <br />(1980) proposes 60. <br />28. These values supported by Barth (1986) and Lindsay and Novel (1978). The high iron <br />level (300 ppm) may not be toxic but may cause significant nutrient imbalances. <br />29. These values are recommended by Barth et al. (1981), Sutton et al. (1981), and Lindsay <br />and Novel (1978). <br />30. This value recommended by MDSL (1983), WDEO (1985), and Barth et al. (1981). <br />31. This value supported by USDI-OSMRE (1985a), Schafer (1979, 1980), Barth et al. <br />(1981), and Sutton et al. (1981) propose 2.0. <br />32. This value recommended by WDEO (1985) and USDA (1957). <br />33. This value proposed by Sutton et al. (1981). <br />34. This value proposed by Schafer (1980); Barth et al. (1981) recommends 0.8. <br />35. This value supported by Schafer (1980). <br />• Revised 27 Aug 2002 28 <br />