2Interesting Facts Phosphorous is a non-metal It is essential for the body's energy transport molecules and for holding DNA and RNA molecules togetherMany non-metals are absolutely essential for body functioning like nitrogen, oxygen, sulfur, etc.
3More Facts…..Oxygen, carbon and nitrogen cycles include gases in the atmosphere. The phosphorous cycle is an example a non-metal cycle that does not have a gas as part of its cycle.
4Importance of Phosphorus Phosphorus, mainly in the form of the ions, is an essential and important nutrient of both animals and plants.
5What is the Phosphorus Cycle? The phosphorus cycle occurs in many different ways. It can be seen from a soil-based view, an ecosystem like view and in a global view.
6The Phosphorus Cycle Crop Atmospheric harvest deposition Animal ComponentInput to soilLoss from soilThe Phosphorus CycleCropharvestAtmosphericdepositionAnimalmanuresand biosolidsMineralfertilizersPlantresiduesRunoff anderosionPrimaryminerals(apatite)Organic phosphorusMicrobialPlant residueHumusPlantuptakeMineralsurfaces(clays, Fe andAl oxides,carbonates)WeatheringAdsorptionImmobilizationMineralizationSoil solutionphosphorusHPO4-2H2PO4-1DesorptionSecondarycompounds(CaP, FeP, MnP, AlP)DissolutionLeaching(usually minor)Precipitation
12Phase Three3) Fertilizers contain both nitrogen and phosphates. Both of which are essential for living cells. The phosphate is essential for DNA, RNA.
13Phase Three (cont.)If farmers place too much fertilizer on their fields, this may alter the phosphorus cycle. An excess of phosphates entering from farmland runoff or erosion may cause rapid growth of algae and other kinds of plants that live in water.
19Phase Six6) Plants or producers are the key in passing on phosphates to other living things. Phosphate enters the plants through the root system. Once inside they become part of the plant's DNA and RNA.
26Phase Nine9) Over time , phosphates are slowly dissolved from rocks by chemical weathering mainly through rain and melting snow. It is then carried into waterways where it enters the water or aquatic phase of the phosphorus cycle.
30Phase Eleven11) Next, animals ingest the plants and by doing so receive the needed phosphate. Once again the idea of direct and indirect comes into playExample: Little fish eats a plant*DirectBig fish eat little fish*Indirect
32Phase Twelve12) In the next step there are two possible outcome. Sea life returns phosphates as dissolved phosphates through death or through excretion of waste materials from their cells or bodies. From here they can either…..
33Phase twelve continued Return to the plantsand producersSettle at the bottom and form marine sedimentsor
35Phase Thirteen13) If the dissolved phosphate becomes marine sediments it can remain at the bottom of a body of water indefinitely. The process by which it is brought back to the surface is known as crustal uplift
40Phosphorus Cycle in Lakes Another prime example of the cycle occurs in lakes. Aquatic plants take in dissolved inorganic phosphorus. Once again the idea of indirect and direct comes into play as the animals eat the plants and one another to get it.Dead animals phosphorus either goes to the plants again or go to the bottom and the cycle repeats
43In SoilIn soil, phosphate is absorbed on clay surfaces and organic matter particles and becomes incorporated . Animals then eat the plants to get the phosphorus and others eat them and continue the cycle.
44Soil continuedAs the animals die they release phosphorus as a waste product in urine and feces. Phosphorus is then released back to the soil when plants or animal matter decomposes and the cycle repeats.
46Globally The earths crust is a main holding place for phosphorus. On land it is found as phosphates.Through erosion phosphates enter rivers and streams which lead them to the ocean.Once in the ocean the phosphorus accumulates on continental shelves in the form of insoluble deposits.
47Global continuedOver time the crustal plates rise from the sea floor and expose the phosphates on land.After more time, weathering will release them from the rock and the cycle's geo-chemical phase begins again.
48Crop residue and manure return phosphate to soil Removal by cropsCrop residue and manure return phosphate to soilRunoff to Water BodyPhosphate Added in FertilizerUptake of PhosphateMineralization of Organic PhosphateInorganic Available PhosphateFixed Phosphate