Ecological Studies on the Revegetation Process of Surface Coal Mined Areas in North Dakota. 2. Physical and Chemical Properties of Overburden and Topsoils as Affected by Time and Amendments.
Safaya-NM; Bares-RH; Malakondaiah-N; Nicholson-SA
NTIS: PB/83-171330 :180 pages
Field experiments were conducted at six coal mine sites in Oliver and Mercer Counties, North Dakota, to determine the subsequent effects of a single application of selected amendments on spoil and topsoils over the 5-year period, 1974-78. Considerable variations in the physical and chemical properties were found in mine spoils from site to site. The texture of spoils ranged from sandly clay loams to loamy sands. The ph of the sites ranged from 6.5 to 8.2. In many cases, the ph values of mine spoils were not significantly different from the topsoils. The electrical conductivity did not exceed 6 mmhos cm-1 at the test sites even though in other studies much higher values were recorded in the vincinity. The spoils can be classed as moderately saline to nonsaline. The sodium adsorption ratios (sar) ranged from less than 1 to 32, with the lowest sar values in the topsoiled sites. Some of the spoils were highly calcareous. The spoils that were the least calcareous showed the calcium carbonate equivalent three times higher than that of the topsoil.
CP; Final Contract Report;
NTIS Accession No.
University of North Dakota