The study was initiated to investigate the feasibility of using CFB
ash as a soil amendment using some of the lime-based minerals in
the residue as a substitute for limestone. The CFB ash, typical of
ash from high sulphur coal-fired fluidized bed combustors, was
found to be an acceptable liming agent for vegetable crops and
mixed forage, with no significant adverse effects on crop quality
or excessive soil loading of metals. Two years of testing on
turfgrass indicates that CFB ash may also be used as a fast-acting
limestone substitute on turfs. Within the first year, ash applied
at the soil lime requirement increased very low soil pH to a range
considered optimal for nutrient availability and crop growth. A
high persistence of liming effects in both ash and limestone
treatments suggests that the materials have comparable residual
activity. This research is of interest to agrologists, waste
management specialists and policy makers.
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