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<br />3. 6 tons/acre <br />4. 8 tons/acre <br /> <br />The lime used for the study was CaC03 waste from the sugarbeet refining <br />process. The amount of lime used for each individual treatment was weighted <br />and spread by hand as evenly as possible. After all plots wer> limed, the <br />plot area was rototilled twice. The plot area was fertilized by hand <br />broadcast at the rate of 200 lb P205/acre (0-46-0) and 200 lb K20/acre <br />(0-0-50). Nitrogen was applied after germination at the rate of <br />60 lb N/acre (33-0-0). The plots were mulched with alfalfa hay at the rate <br />of 2 tons/acre. The amount of alfalfa mulch applied to each plot was <br />estimated by the weight of the bales, after which the mulch was hand spread <br />as evenly as possible, the plot area was again rototilled twice and <br />cyclone-seeded with the Climax seed mixture at the rate of 40 11~/acre. The <br />plots were lightly raked to cover the seeds. The seeding oF~eration was <br />completed on 23 July 197fi. <br />Examination of the plots on 25 August 1977 revealed a good stand of grasses <br />on all plots. As expected, no differences among the lime rates treatments <br />were evident at that time since the pyrite oxidizes over a period of time. <br />Long term observations are planned to evaluate the effects of the different <br />rates of lime application. <br />9.1.6 Straw Mulching Study in Tailing 1976 <br />Apparently, favorable plant growth resulting from high manure application <br />rates (Section 9.1.4) on the tailing was partly due to the more favorable <br />microclimate created-the manure protected the seedlings from wind erosion <br />and modified the temperatures. The manure may also have im:reased the <br />water-holding capacity of the tailing. Although effective, transportation <br />of large quantities of manure to Climax was very costly. Therefore a study <br />at Climax by Dr. Berg and Henry Barrou to test the effectiveness of straw <br />mulch in enhancing plant growth on tailing was established. <br />The mulching study consisted of six treatments, replicated three times. <br />13 <br />