Abstract
A serial batch leaching experiment was carried out to evaluate the release of elements from wood ash mixed with a strongly acidic forest soil sample. Wood ash application resulted in increased leachate pH, dissolved organic carbon (DOC), and electrical conductivity (EC). Increasing application of wood ash increased cumulative release of inorganic carbon (IC), chloride (Cl), nitrate (NO3), sulfate (SO4), potassium (K), sodium (Na), calcium (Ca), magnesium (Mg), manganese (Mn), phosphorus (P), and copper (Cu). Release of NO3, P, iron (Fe), aluminum (Al), Cu, and lead (Pb) continued. Large amounts of DOC, K, Ca, and SO4 were mobilized. Inorganic C, Fe, and Mg were released in moderate quantities. Manganese, Na, Al, Cl, and NO3 were released in limited amounts. Amounts of leached P, Pb, and Cu were lower. The mixed order equation adequately described the release of elements in the soil‐ash mixture. Accumulation of elevated amounts of trace elements does not appear to be a problem when higher wood ash rates are avoided. Wood ash should be applied in split application to avoid short‐term concentrated alkaline and salty conditions that could interfere with plant growth.
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