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<br />application. The control plots (no manure) had considerable winter <br />kill to the point that they were practically bare. Border effect <br />from sand blowing was quite noticeable along the west :;ide, but not <br />on the east side of the plot area. <br />• 20 August 1976. Great differences are evident among t:he fertility <br />treatments within each plot. The northern half of each plot was <br />fertilized in the spring of 1975 at the rate of 6Ci lb/acre as <br />NH4N03. The main differences between plots were in the height, <br />thickness, and color of the grass. Also, the number and size of <br />seed heads on the area fertilized this year and last year was quite <br />impressive when compared to areas with no N application. These <br />differences were especially noticeable on plots receiving low <br />application rates of manure. Considerable winter kill was found on <br />control and plots with low rates of manure. Border effect due to <br />sand blowing was more evident this year, not only on the outside <br />edges, but also on plots adjacent to the controls and low manure <br />application plots where large areas were either bare or with low <br />plant density. <br />9.1.5 Lime Rate Study on Tailing 1976 <br />The oxidation of pyrites makes it very difficult to predict the amount of <br />lime needed for long-term neutralization of acid tailing in the field. In <br />1976, Dr. Berg and Harry Barrou of CSU conducted a study to (1) determine <br />the optimum lime rate to apply to coarse-textured Climax tailing under field <br />conditions, (2) monitor the acidity levels of the tailing treatrt~ents over a <br />long term and (3) monitor lime movement in the tailing profile as affected <br />by natural precipitation over time. <br />The study tested four lime rates over three applications. The lime rates <br />were <br />1. 2 tons/acre <br />2. 4 tons/acre <br />12 <br />