Linked from
The 27 pages that link to Phosphorus cycle, each with the reason it gives.
Biogeochemical cycleBroader topic: Its slow geological transfers often limit biological production.
PhosphateNarrower topic: It traces phosphate through ecosystems and human supply chains.
Agricultural chemistryRelated: Its slow recycling and limited availability shape fertilizer needs.
Carnivory in plantsRelated: Captured prey can provide phosphorus where soil supplies little.