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study found that the point at which nu significant increase in crop production <br />• occured was 45 cm of replaced topsoil. <br />However, for rangelands, 30 cm of soil "...produced the greatest species diver- <br />sity and no significant difference in bidmass production or cover were found <br />between 30, 45, or 60 cm of topsoil." (Red cote, 1986) <br />The combined study found that fertilizing spoils with phosphorus, or spoil <br />manipulations such as disking or ripping (scarification) had no positive affect <br />on plant establishment. <br />ality of Growth Medium <br />The quality of the growth medium will be a major determinant of vegetation suc- <br />cess. Factors such as pH, CEC, EC, ESP, texture and nutrients can all signifi- <br />cantly affect plant growth. As is evidenced by the soils information provided <br />for Trapper Mine in Section 2.6, the soils present and available to use fur <br />reclamation generally have good p1anC growth media characteristics. All of the <br />• important parameters fall within acceptable limits for plant growth. <br />Lo am s, silt loam s, clay looms and sandy clay looms are the predominant soil tex- <br />tures within the proposed mine plan area. These soils exhibit moderate to moder- <br />ately slow water permeability, but have a fairly high moisture storage capacity <br /> <br />3-53a <br />REVISED FEB 13 '87 <br />