title: Circulating fluidized bed combustion product addition to acid soil: alfalfa (Medicago sativa L.) composition and environmental quality.
abstract: To reduce S emissions, petroleum coke with a high concentration of S was combusted with limestone in a circulating fluidized bed (CFB) boiler. The combustion process creates a bed product that has potential for agricultural uses. This CFB product is often alkaline and enriched in S and other essential plant nutrients, but also contains high concentrations of Ni and V. Agricultural land application of CFB product is encouraged, but little information is available related to plant responses and environmental impacts. CFB product and agricultural lime (ag-lime) were applied at rates of 0, 0.5, 1.0, and 2.0 times the soil's lime requirement (LR) to an acidic soil (Wooster silt loam). The 2.0x LR application rate of CFB product was equivalent to 67.2 Mg ha(-1). Alfalfa yield was increased 4.6 times by CFB product and 3.8 times by ag-lime compared to untreated control. Application of CFB product increased the concentration of V in soil and alfalfa tissue, but not in soil water, and increased the concentration of Ni in soil and soil water, but not in alfalfa tissue. However, these concentrations did not reach levels that might cause environmental problems.
authors.affiliation: School of Environment and Natural Resources, The Ohio State University, Wooster, Ohio 44691, USA.
authors.forename: Liming
authors.initials: L
authors.lastname: Chen
authors.forename: Warren A
authors.initials: WA
authors.lastname: Dick
authors.forename: David
authors.initials: D
authors.lastname: Kost
mesh_terms: D016573:Agrochemicals / Q000737:chemistry*; D002119:Calcium Carbonate / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003077:Coke / Q000032:analysis; D004777:Environment; D006863:Hydrogen-Ion Concentration; D000455:Medicago sativa / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013455:Sulfur / Q000737:chemistry; D014131:Trace Elements / Q000032:analysis; D014867:Water / Q000737:chemistry
chemical_list: D016573:Agrochemicals; D003077:Coke; D012987:Soil; D014131:Trace Elements; D014867:Water; D013455:Sulfur; D002119:Calcium Carbonate