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<br />REVEGETATION RECOMMENDATIOPIS <br />The following recommendations are based on the revege- <br />tation plot studies, field observations and general experi- <br />ence. <br />Depth of Sand over Clay Shale <br />we recommend a minimum of three feet of sand over the <br />clayey spoil. The top foot should consist of existing top <br />soil. This recommendation is largely subjective, because <br />the depth-of-sand plots can not reveal ecological conse- <br />quences for several years, Shallow sand depths, as found <br />in the northeast corner of section 30, tend to exclude sand- <br />sage and the important tall grasses prairie sandreed and <br />sand bluestem. <br />we also recommend pitting or furrowing of the clay shale <br />spoil on the contour, if there is appreciable slope, before <br />covering with sand to hold sub-surface water and prevent <br />downslope seeps. <br />Seed Mixture <br />we recommend the following seed mixture: <br />Prairie sandreed at 10 pls (pure live seed)/sq.ft. <br />Sand bluestem at 4 pls, <br />Blue grama at 9 pls, <br />Western wheatgrass at 4 pls, <br />Sand dropseed at 1 pls, <br />Indian ricegrass at 1 pls, <br />Sideoats grama at 1 pls, <br />Little bluestem at 1 pls. <br />Compared to the seed mixture used•on the plot trials, <br />.the recommended mixture includes more sand bluestem, which <br />• is more common in the natural plant community than was <br />known when the plots were prepared. <br />1 <br />