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f. • • 4, To soil a lication The recommendation for topsoil should be based primarily on need and cost. Topsoil is needed on sites having an exposed soil surface low in organic matter and texture class ificatien of clay loam or heavier. This need increases significantly if the soils are inherenl-ly dry, if tl;e slopes are greater than 6:1 and if the slope aspect is soutl: or southwest. The total cost of topsoil should include cost of purchase, trans- portation, and application. Topsoil should be applied after shaping and grading have been completed • and the site tilled to a depth of aooroximasgiv 6 inches. Tillage permits topsoil to bind with existing soil. Rinding of soil layers prevents air pockets, encourages root penetration, and prevents topsoil slippage on slopes. Following application of topsoil, final steps in seedbed preparation should be completed. 5. Fertilizer applicati~ A. Most critical areas should be fertilized. B. If fertilizer is recommended, rate of application should not be less than 50 lbs/A of nitrogen applied as part of a complete fertilizer with an analysis ratio of not less than 10-6-4 (NPK). C. Time of application should normally be immediately prior to • seeding. If proper equipment i.s used, fertilizer may be applied at time of seeding. If' the nutrient content of the soil is sufficient for establishment, it may be desirable to apply fertilizer after grass is well established, This pro- cedure allows the grass, rather than weeds, to better utilize the plant nutrients, , 6. Mulching A. All critical areas will be mulched. lFor purposes of establishing vegetation, a critical area is described as a site having adverse conditions. to the extent that normal farming practices will not period of time, For instance, all dams will be mulched, but often it is not necessary to mulch the flat borrow areas, even though the entire acreage is reported as cr:tical area planting). Page 2 of 4