1980-07-11_REVISION - M1977493 (8)

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Materials and Methods This manure study on the tailing contained five treat- ments ( control, 10, 20, 40, and 80T/A of manure) with four re- plications. The plot area was 48 feet wide by 180 feet long , and each individual plot was 12 feet wide by 36 feet long . Greenhouse work showed that to maintain a pH of 7 on the tailing, four times the lime requirement obtained by labora- tory test had to be added. This is equivalent to a liming rate of 2 tons CaCO3 per acre foot for the tailing in the plot area. This amount of lime as CaO was evenly applied to the tailing with a fertilizer spreader on September 13 and 14 of 1973 . After the lime was spread , the plot area was rototilled to a depth of 6 inches. The tailing was limed in late summer so that snowmelt could leach the salts before seeding in the spring and also to give enough reaction time for the lime to neutralize the tailing in the mixed-layer. The manure was applied in late summer to allow the snowmelt to leach any possible build-up of salts as a result of the manure treatments. On June 3 , 1974 , the plot area was rototilled again and broadcast fertilized at the rate of 150 lbs/A P2O5 ( 300 lbs. 0-46-0/A) and 200 lbs./A K2) ( 400 lbs. of 0-0-60/A) . The control plot was fertilized with ammonium nitrate at the rate of 60 lbs. N/A. Five inches of snow that had accumulated on the tailing during the night of June 3 were rototilled into the tailing along with the fertili- zers. The plots were seeded on June 6 , 1974 , on 5 inches of snow with the Climax seed mixture . The seeds were broadcast by cyclone seeder over the freshly rototilled tailing and seeded at the rate of 40 lbs/A. No attempt was made to cover the seeds. Results A. September, 1974 : Visual evaluation of the plots was made during the second week of September, 1974 . This evaluation reflected the plant stand and vigor for the fast growing season. The overall stand was good on all treatments , plant vigor was 9-7