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Largest P reservoir
Rocks & ocean sediments
What phase does the P cycle lack?
Atmospheric phase
Where is P a limiting nutrient?
Because it cycles slowly phosphorus is often a limiting nutrient in aquatic & terrestrial ecosystems.
Major natural source of P
weathering or rocks releases PO4-3) which is carried by runoff into nearby soils & bodies of water.
Synthetic sources of P
Fertilizers & detergents
(Run off carries P into nearby bodies of water)
Geological uplift
Tectonic plate collision that forces up rock layers and creates mountains.