title: Dose-related effect of fly ash on edaphic properties in laterite cropland soil.
abstract: 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, PO(4), Ca and Na of soil increased with dose and time, but OC, NO(3) 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.
authors.affiliation: Soil Ecology Laboratory, Department of Zoology, Visva-Bharati University, Santiniketan 731235, West Bengal, India.
authors.forename: Gourab
authors.initials: G
authors.lastname: Roy
authors.forename: Vadakepuram Chacko
authors.initials: VC
authors.lastname: Joy
mesh_terms: D039903:Actinobacteria / Q000187:drug effects / Q000201:enzymology; D000383:Agriculture; D001419:Bacteria / Q000187:drug effects / Q000201:enzymology; D002118:Calcium / Q000032:analysis; D002244:Carbon / Q000032:analysis / Q000633:toxicity*; D060729:Coal Ash; D004305:Dose-Response Relationship, Drug; D005658:Fungi / Q000187:drug effects / Q000201:enzymology; D006863:Hydrogen-Ion Concentration; D007194:India; D007220:Industrial Waste; D008372:Manure; D008903:Minerals / Q000737:chemistry; D009566:Nitrates / Q000032:analysis; D052638:Particulate Matter / Q000633:toxicity*; D010710:Phosphates / Q000032:analysis; D011188:Potassium / Q000032:analysis; D012964:Sodium / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000633:toxicity*; D018505:Waste Management
chemical_list: D060729:Coal Ash; D007220:Industrial Waste; D008372:Manure; D008903:Minerals; D009566:Nitrates; D052638:Particulate Matter; D010710:Phosphates; D012987:Soil; D012989:Soil Pollutants; D002244:Carbon; D012964:Sodium; D011188:Potassium; D002118:Calcium