Abstract
Abstract Land application of wood ash is a rapidly growing disposal option for industries combusting wood for steam or electricity. Recent research has demonstrated that wood ash is a valuable soil amendment and liming agent. The objective of this study was to examine the potential phytotoxic components of wood ash and their interactive effects in order to determine appropriate land application rates. Bush beans (cv. ‘Blue Lake 274') were grown under greenhouse conditions in an acidic Palouse silt loam soil treated with a background concentration of wood ash equivalent to 10 mt/ha (0.09 kg/ha of B, 462 kg/ha of K, and pH 6.5). The ash‐soil mixture was then amended with different concentrations of B, K, and CaO (for pH change) in a completely randomized factorial experiment. Soil pH and K concentration appeared to be the major rate limiting components in land application of wood ash. Bean yield was adversely impacted when application rates resulted in a soil pH >6.5 and 2,662 kg K/ha. Since pH was the most...
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