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A researcher extracting a gas sample from soil in tropical forest at El Verde, Puerto Rico, site of the Luquillo Long-Term Ecological Research Program.
The Feammox pathway: the conversion of ammonium (NH4+, a key plant nutrient) to inert dinitrogen gas (N2, the main constituent of the atmosphere) or other nitrogen forms under anaerobic conditions. The Feammox pathway uses iron oxides (Fe), which are abundant in many soils.