1) Greatest reservoirs of phosphate are the insoluble ferric and calcium phosphates in rocks (rock phosphate) in combination with calcium, iron and aluminium. Slow process of weathering releases phosphates to the soil.
2) Phosphates are also added to the soil by man in the form of artificial fertilizers.
3) Some quantity of phosphorus is deposited in deep sediments in oceans and is brought to the cycle by upwelling (but not extensive).
francis1897 answered the question on February 27, 2023 at 08:44
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