Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 74, Issue 4, Pages 769-775Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2010.10.041
Keywords
Coal fly ash; Laterite soil; Soil nutrients; Total microbial count; Soil enzyme activity
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Funding
- Department of Science and Technology, Government of India, New Delhi [SP/SO/C-40/2000]
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Short-term laboratory and field studies showed dose-based effect of coal fly ash on chemical and microbial properties of laterite cropland soil. Sandy loam soil mixed with farmyard manure (10% w/w) and amended with fly ash at 5%, 10%, 20%, 40% w/w (50-400 t ha(-1)) was incubated in the laboratory and added to field plots. The pH, EC, PO4, Ca and Na of soil increased with dose and time, but OC. NO3 and K decreased. There was temporary inhibition of bacteria, fungi and actinomycetes populations at 5% and 10% doses, but 20% and 40% were harmful. Activities of major soil enzymes declined at higher doses. Amylase, cellulase and invertase recovered in 5% and 10%, these doses did not affect dehydrogenase but benefited phosphatase and arylsulphatase activities. The above assessments showed that up to 100 t ha(-1) fly ash is apparently safe to microbial characteristics of tropical red laterite soil. (C) 2010 Elsevier Inc. All rights reserved.
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