Laserfiche WebLink
<br />Greenhouse work showed that to maintain a pH of 7 on the tailing, four times <br />the lime requirement predicted by laboratory tests had to be added. This is <br />equivalent to a liming rate of 2 tons CaC03 per acre ft for tFie tailing in <br />the plot area. This amount of lime as Ca0 was evenly applied to the tailing <br />with a fertilizer spreader on 13 and 14 September 1973. After the lime was <br />spread, the plot area was rototilled to a depth of 6 in. the tailing was <br />limed in late summer so that snowmelt could leach the salts before seeding <br />in the spring and also to give enough reaction time for the lime to <br />neutralize the tailing in the mixed-layer. The manure was applied in late <br />summer to allow the snowmelt to leach any possible build-up oi' salts as a <br />result of the manure treatments. On 3 June 1974, the plot area was <br />rototilled again and broadcast fertilized at the rate of 150 lb P205/acre <br />(300 lb 0-46-0/acre) and 200 lb K20/acre (400 1b 0-0-60/acre). The control <br />plot was fertilized with ammonium nitrate at the rate of 60 lb NJacre. Five <br />inches of snow that had accumulated on the tailing was tilled along with the <br />fertilizers. <br />The plots were seed on 6 June 1974 with the Climax seed mixture.. The seeds <br />were broadcast by cyclone seeder over the freshly rototilled tailing at the <br />rate of 40 lb/acre. No attempt was made to cover the seeds. <br />Results <br />• September 1974. Visual evaluation of the plots during the second <br />week of September 1974 revealed that the overall steind for the <br />first growing season was good on all treatments; plant vigor was <br />much greater on the high rate manure plots. The west side of the <br />plots area was slightly affected by blowing tailing. <br />• 4 September 1975. Ground cover by vegetation was much greater for <br />the high manure plots (Tables 3 and 5). The northern half of each <br />plot was fertilized on 19 June 1975 at the rate of 60 lb N/acre as <br />NH4N03. The grass in all the manure treated plots responded to N <br />fertilization, even in the plots with 80 tons/a~:re manure <br />11 <br />