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Fig. 3. pH before and after pea cultivation in dilution series of two of the ash extracts used in the toxicity test. These are extracts of fly ashes with (a) high and (b) low alkalinity, originating from the incineration of bio fuel (BA1) and wood construction waste (WA), respectively. Seedlings growing in dilutions in which the pH decreased to below 7 all displayed growth similar to that of the controls (n = 3, ±SE).

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