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The Phosphorous Cycle Source: http://vincejtremante.tripod.com/cycles/phosphours.htm - The combination of three factors makes phosphorus a nutrient of concern in most ecosystems: Most soils have only small amounts from the weathering of unevenly distributed rocks. Phosphorus is more insoluble than other nutrients and less mobile, hence less phosphorus travels in the soil solution; roots generally must grow into a zone of phosphorus availability. Phosphorus that drains from the land to the ocean is used by organisms in the surface waters, but a considerable amount is lost to the sediments in the shells and bones of marine organisms and by precipitation and settling of phosphates. ES – Biogeochemical Cycles (Handout) SCI44E pg. 1