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Characteristic <br />Preferred Ranges <br />Particle size <br />3/8 -1/2 in. screen and 2 -3 in. screen; ratio = 3:1 <br />Moisture content <br />20 -50% <br />Soluble salt <br />3.0 - 6.0 mmhos /cm <br />Organic matter <br />40 - 70% <br />pH <br />6.0 - 8.0 <br />Nitrogen content <br />0.5 - 2.0% <br />Human made inerts <br />0.0 - 1.0% <br />Application rate /size <br />20 -30 tons per acre <br />GCC Rio Grande, Inc. -Red Rock Mine <br />Drought Management Plan <br />• Fosters the growth of soil microbial populations and humate <br />production, which in turn enhances soil aggregate formation; <br />Organic matter application rates typically will be based on slope gradients and lengths. Longer, <br />steeper slopes will typically receive higher application rates than shorter, flatter ones. Organic <br />matter applications will normally range between 20 and 30 tons per acre. Organic matter may or <br />may not be incorporated depending upon the nature of the application and the conditions of the <br />site where it is to be applied. Generally, a mix of fine and course grades of organic matter is <br />best for controlling erosion. Fine organic matter (passing through a 3/8 -1/2 inch screen) <br />interfaces more effectively than larger sized particles at the soil surface. Higher organic matter <br />content in the upper soil profile increases water infiltration and water holding capacity. In <br />addition, the fine organic matter is essential for rapid vegetation establishment and long -term soil <br />and plant health. The long -term nutrient value that organic matter supplies comes from the finer <br />portion. Coarse grades of organic matter (passing through a 2 -3 inch screen) help prevent <br />splashing of raindrops directly on the soil surface and are less likely to be disturbed by rainfall <br />and storm runoff. The coarse grades also perform like filters by "stopping" or "catching" soil <br />particles already in motion. Table 1 provides general specifications for organic matter capable of <br />reducing erosion and enhancing plant growth. <br />Table 1. Organic Matter Specifications <br />Habitat Management, Inc. <br />8 <br />03 / 03 / 2003 <br />