Abstract
Unweathered, acidic fly ash from a coal-fired power plant was applied to alfalfa meal-amended agricultural soil at levels equivalent to 0, 100, 400, and 700 tonne ha−1. Amended soils were placed in respirometer jars and monitored for C02-C evolution over a 37-day period. Fly ash applications of 400 and 700 tonne ha−1 reduced C02-C production significantly compared to 0 and 100 tonne ha−1 treatments. Carbon dioxide-carbon from all treatments was considerably greater than that from soil treated with 1000 ppm CdCl2. The results suggest that soil heterotrophic microbial activity may be impacted minimally by relatively low levels of fly ash application, but may be inhibited by higher levels of fly ash. Several metals were present at potentially toxic levels in the fly ash employed and may have accounted for the inhibition of CO2 C evolution. The availability of some of these metals was indicated in companion plant uptake experiments.
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Arthur, M.F., Zwick, T.C., Tolle, D.A. et al. Effects of fly ash on microbial C02 evolution from an agricultural soil. Water Air Soil Pollut 22, 209–211 (1984). https://doi.org/10.1007/BF00163101
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DOI: https://doi.org/10.1007/BF00163101