Haber process used to manufacture nitrates which are applied to the soil., Draining bogs reduces the anaerobic processes of denitrification, Ionising processes increase due to combustion., Leguminous plants are grown which increases nitrogen fixation., Incinerating sewage returns nitrogen to the atmosphere., Using sewage as fertiliser adds nitrogen to the DOM in the soil., Once food is harvested and eaten some nitrogen is lost in waste faeces., Nitrogen pollution in waterways caused by sewage can lead to eutrophication., Harvested plants are eaten as food., Harvested animals are eaten as food., Increased plant growth rate depletes nitrates from the soil., Harvesting plants means less organic matter is returned to the soil., Harvesting animals means less nitrogen is returned to the soil when they die., Less organic fertiliser use results in less natural ammonification., Less ammonia ions in the soils results in less oxidation by Nitrosomonas., Less nitrite ions in the soil results in less oxidation by Nitrobacter.

Nitrogen Cycle

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