Allelopathic effects of plant seeds on nitrification: effects on ammonium oxidizers
1992
Kholdebarin, B. | Oertli, J.J.
Effects of cotyledon powder from seeds of higher plants (tea and several varieties of oaks) known to be rich in phenolic compounds on biological oxidation of NH(+4) and NO(-2) to NO(-3) were investigated. Treating culture solutions with cotyledon powder resulted in a rapid disappearance of both NH(+4)-N and NO(-2)-N during the first 2-3 days of the experiments. Such losses were believed to be due to fixation of NH(+4) and volatilization of NO(-2)-N by phenolic substances and also to reactions with other organic C compounds present in cotyledon tissues. It is also suggested that some of the NH(+4)-N and 4 NO(-2)-N may have been immobilized by heterotrophic bacterial growth.
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