Milestones in order. This is history, not a weekly activity grid.
- Boussingault rotations
- Hellriegel and Wilfarth
- Winogradsky nitrifiers
- Beijerinck Azotobacter
- Haber ammonia
- Bosch scale-up
- Anammox named
- Comammox described
Darker cells mean a higher score for this topic on that metric.
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Quick answers
Where should I start with Nitrogen cycle?
Read Identity → How they live → Body & health, then use compare rails.
Is this page advice for Nitrogen cycle?
Public-health education — not a care plan, prescription, or outbreak briefing.
What does the local lens add?
It names everyday desks for Beneficial allies before English norms look universal.
Are the scores a ranking of Nitrogen cycle?
No — editorial 0–100 browsing aids inside this atlas only.
How do I compare Nitrogen cycle to neighbours?
Use related cards and best-of / quiz rails after the first three chapters.
Which chapter is densest?
How they live and Body & health carry mechanisms; skim Identity first.
People knew legumes enrich soil before they knew bacteria. Chemistry then named the gases; microbiology named the workers.
The 20th century added a factory that now rivals the nodule.
Timeline
Jean-Baptiste Boussingault measures that legumes enrich soil nitrogen.
Living nodules, not just soil magic, explain legume nitrogen.
Chemolithotrophic nitrifiers are isolated as a teaching pair.
Free-living aerobic fixers join the nodule story.
Fritz Haber demonstrates high-pressure catalytic ammonia.
Carl Bosch industrialises the process at Oppau — bread and explosives share a factory.
Anaerobic ammonium oxidation is recognised as a missing shortcut.
Complete ammonia oxidisers collapse the two-step textbook in some lineages.
History is bread, rivers and treatment plants.
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