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Abstract
Allelopathic effects of Chenopodium album L. leaf aqueous extract on nitrification were investigated. In the presence of leaf extracts, complete nitrite oxidation to nitrate was delayed significantly. Also, in the presence of leaf extract the amounts of both nitrite and nitrate produced were significantly higher than those in control solutions. This increase was attributed to protein hydrolysis and ammonification of resulting amino acids present in leaf extracts. The delay in nitrification was proposed to be due to the presence of phenolic acids in this plant.