The end product of the reaction in both cases is ammonium ions. Uptake of phosphate ions by the plant. Rate of weathering of apatite. The presence of soil organic matter that complexes with phosphate. Phosphorus cycling is a perfect biogeochemical cycle.
Energy flows, nutrients cycle.
Most phosphorus is present in the labile soil pool. Phosphorus fertilizers are made from many different types of phosphate minerals. Under anaerobic conditions phosphate is always insoluble. The albedo value for snow is very high. Interstadials are temporary cold periods.