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Dehydrogenase activity (DHA) μgTPF g–1 24 h–1 in the sediment. Control: no biochar; T1: paddy straw biochar (PSB) application in sediment; T2: sediment amended with KOH-activated PSB; T3: sugar cane bagasse biochar (SBB) application in sediment; T4: sediment amended with KOH-activated SBB.
