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Phosphorus

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  7. Phosphorus Fertilizers SOIL 5813 Soil-Plant Nutrient Cycling and Environmental Quality Department of Plant and Soil Sciences Oklahoma State University Stillwater, OK 74078 email: wrr@mail.pss.okstate.edu  Tel: (405) 744-6414  Phosphorus Use Efficiency ? Rock Phosphate Ca 10 (PO 4 ) 6 (OH) 2   Hydroxyapatite (bones, teeth) “bone - meal”  bones in acid soils? Ca 10 (PO 4 ) 6 F 2 or Cl 2  or OH 2  Fluorapatite 27-41% P 2 O 5   Total P in soils (90 to 2000 lb /acre, avg. of 800 in the surface horizon) Calcium Orthophosphates P fertilizers: water soluble citrate soluble (dissolves more P than water) OSP ordinary superphosphate (0-20-0)  rock phosphate + sulfuric acid  mixture of monocalcium phosphate and gypsum  16-22% P 2 O 5  (90 % water soluble)  8-10% S as CaSO 4    H 2 SO 4 (NH 4 ) 2 SO 4 20%Nammonium sulfateHNO 3 NH 4 NO 3 33%Nammonium nitrateCO 2 (NH 2 ) 2 CO45%NureaH 3 PO 4 NH 4 H 2 PO 4 11-18%Nammoniated phosphates11-48-018-46-0HNO 3 /rock phosphatenitric phosphatesNH 3  +  3CH 4  + 3O 2  + 2N 2  4NH 3  + 3CO 2 High temp (1200°C)High pressure (200-1000 atm)(magnetite, Fe 3 O 4 ) catalystMethaneAnhydrous Ammonia Haber-Bosch: (Germany, 1910)
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