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C <br />ALLEN MINE <br />Methods <br />Three study plots were established at the Allen Mine: The Main Plot and <br />Species Evaluation Plot are located on a level area of the shale waste <br />material; the Slope Plot is situated 20 m north of the Main Plot on a southeast - <br />facing slope (Figure 9). <br />Main Plot <br />The plot arrangement is a split plot block design with three replications <br />uniform application of 220 kg P205/ha as triple phosphate and 66 kg K20/ha as <br />muriate of potash. Each treatment was split and half treated with 3,360 kg of <br />gypsum per hectare (Figure 9). The phosphorus, potassium, and gypsum were <br />surface appliedna d worked into the waste material by rototilling. Nitrogen <br />additions as ammonium nitrate in Treatments 3-8 was added in split applications: <br />half applied in November 1976 and the remainder in May 1977. Treatments <br />studied included: <br />Treatment 1: Control (no fertilizer, no mulch) <br />Treatment 2: 220 kg P205/ha, 66 kg K20/ha <br />Treatemnt 3: 220 kg P205/ha, 66 kg K20/ha, 66 kg N/ha <br />Treatment 4: 220 kg P205/ha, 66 kg K20/ha, 132 kg N/ha <br />Treatment 5: 220 kg P205/ha, 66 kg K20/ha, 66 kg N/ha + excelsior mulch • <br />41 <br />of eight <br />treatments, each split <br />by an <br />application <br />of <br />gypsum. <br />Subplots measure <br />C3.1x9.0 <br />m. All treatments, with <br />the <br />exception of <br />the <br />Control, <br />• <br />received a <br />uniform application of 220 kg P205/ha as triple phosphate and 66 kg K20/ha as <br />muriate of potash. Each treatment was split and half treated with 3,360 kg of <br />gypsum per hectare (Figure 9). The phosphorus, potassium, and gypsum were <br />surface appliedna d worked into the waste material by rototilling. Nitrogen <br />additions as ammonium nitrate in Treatments 3-8 was added in split applications: <br />half applied in November 1976 and the remainder in May 1977. Treatments <br />studied included: <br />Treatment 1: Control (no fertilizer, no mulch) <br />Treatment 2: 220 kg P205/ha, 66 kg K20/ha <br />Treatemnt 3: 220 kg P205/ha, 66 kg K20/ha, 66 kg N/ha <br />Treatment 4: 220 kg P205/ha, 66 kg K20/ha, 132 kg N/ha <br />Treatment 5: 220 kg P205/ha, 66 kg K20/ha, 66 kg N/ha + excelsior mulch • <br />41 <br />