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76 <br />shale to the overlying soil material. The control or soil check panel <br />• was ripped to a depth of 30 cm and graded to surface contour. <br />The completed, artificial soil-shale profiles are: <br />1. Processed shale without any surface covering, <br />2. 30.5 cm soil over retorted shale, <br />3. 91.5 cm soil over retorted shale, <br />4. Soil check with no retorted shale, <br />5. 61 cm soil aver retorted shale, and <br />6. 61 cm soil aver 30.5 cm capillary barrier aver retorted shale. <br />The experimental design far the Retorted Shale Successional Study <br />consists of three treatment variables (sail-shale profile, seed mixture, <br />and fertilizer treatment) applied in a split-split block design <br />(Figure 26). The basic design was replicated three times. Both the <br />three seed mixtures and the three fertilizer treatments were randomized <br />prior to application. The study was drilled with the three seed mixtures <br />(Table 10) in the fall of 1977. The three fertilizer treatments were as <br />follows: <br />Nitrogen Phosohorus <br />112 kg/ha 56 kg/ha <br />56 kg/ha 28 kg/ha <br />0 kg/ha 0 kg/ha <br />Phosphorus was applied prior to seeding while the nitrogen was not <br />applied until the end of the first growing season. <br /> <br />