... NO3 is the amount of nitrate in the soil layer (kg N ha 1 ). The C:P ratio is calculated as(7 .14 )7.2.3 INORGANIC PHOSPHORUS SORPTION The inorganic P pool, originating either from mineralization ... Station, TXCONTENTS7 .1 SWAT Model Background 16 47.2 Phosphorus Modeling in SWAT: Soil Phosphorus Interactions 16 77.2 .1 Initialization of Soil Phosphorus Levels 16 87.2.2 Mineralization, Decomposition, ... Immobilization 17 07.2.3 Inorganic Phosphorus Sorption 17 17.2.4 Leaching 17 37.2.5 Fertilizer Application 17 37.2.6 Phosphorus Uptake by Plants 17 4© 2007 by Taylor & Francis Group, LLC 17 4 Modeling Phosphorus...