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lowering of the pH. <br />2.5 Color - Temperature <br />Refuse material is generally a black to grey color unless <br />salts accumulate at the surface. This dark surface creates <br />extreme surface temperatures and may be a major factor in <br />reducing seed germination and plant establishment. Furthermore, <br />the dark color persists with time; thus, methods to decrease soil <br />surface temperatures would probably have to be implemented for <br />plant establishment. Zt was observed that a shallow depth of <br />soil over the refuse reduced soil temperatures and encourged <br />seedling development. Mulching or other amendments may perform <br />• similar functions. <br />.~ <br />2-11 <br />