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The 65 pages that link to Nitrogen cycle, each with the reason it gives.

• AmmoniaNarrower topic: Ammonia is a central intermediate in biological and human-altered nitrogen flows.

• Nitrogen fixationNarrower topic: Fixation is the cycle’s entry route from atmospheric nitrogen into reactive forms.

• Green RevolutionNarrower topic: Heavy synthetic nitrogen use altered nutrient flows and contributed to pollution.

• AnthropoceneNarrower topic: Industrial fertilizer production and use have substantially altered nitrogen flows and left sedimentary signals.

• NitrogenNarrower topic: It traces how nitrogen changes form and moves through ecosystems.

• Nitrous oxideNarrower topic: Microbial steps in the nitrogen cycle generate most naturally occurring and agricultural nitrous oxide.

• UreaNarrower topic: Urea carries biologically processed nitrogen back into soils and ecosystems.

• Biological nitrogen fixationNarrower topic: Fixation is the main natural route that brings atmospheric nitrogen into many ecosystems.

• NitrateNarrower topic: Nitrate is one of the cycle’s mobile, biologically available forms of nitrogen.

• Fritz HaberNarrower topic: Haber’s process intervened in the natural cycle by adding reactive nitrogen at industrial scale.

• Haber processNarrower topic: Industrial fixation adds reactive nitrogen to natural cycles on a scale comparable to biological fixation.

• Nutrient pollutionNarrower topic: It explains how reactive nitrogen reaches ecosystems and changes form after release.

• NitrificationNarrower topic: Nitrification is one microbial transformation within this larger cycle.

• Nitrogen fertilizerNarrower topic: Soil transformations in the nitrogen cycle determine which fertilizer forms plants can absorb.

• Greenhouse gas emissions from agricultureNarrower topic: It explains how applied nitrogen can become nitrous oxide.

• Plant nutritionNarrower topic: Plant nitrogen supply depends on transformations in the wider nitrogen cycle.

• NitrogenaseNarrower topic: Nitrogenase introduces biologically available nitrogen into the cycle.

• Synthetic fertilizerNarrower topic: Fertilizer nitrogen enters this wider cycle, where it can nourish crops or escape into the environment.

• FrankiaNarrower topic: Frankia fixation introduces atmospheric nitrogen into the biological nitrogen cycle.

• Nitrous acidNarrower topic: Nitrite and related nitrogen species occur as intermediates in this cycle.

• Ostwald processNarrower topic: The process industrially fixes and transforms nitrogen into biologically available compounds.

• Intensive farmingNarrower topic: Intensive fertilizer use alters this global cycle through excess reactive nitrogen.

• AnaerobicNarrower topic: Anaerobic microbial reactions drive key steps, including denitrification.

• Dinitrogen pentoxideNarrower topic: N₂O₅ is one atmospheric route transferring reactive nitrogen into nitrate.

• NitrososphaeriaNarrower topic: Their metabolism helps regulate nitrogen availability and transformations in ecosystems.