nut_pminrl2 Subroutine

subroutine nut_pminrl2()

Uses

  • proc~~nut_pminrl2~~UsesGraph proc~nut_pminrl2 nut_pminrl2 module~basin_module basin_module proc~nut_pminrl2->module~basin_module module~hru_module hru_module proc~nut_pminrl2->module~hru_module module~organic_mineral_mass_module organic_mineral_mass_module proc~nut_pminrl2->module~organic_mineral_mass_module module~output_landscape_module output_landscape_module proc~nut_pminrl2->module~output_landscape_module module~soil_module soil_module proc~nut_pminrl2->module~soil_module module~time_module time_module proc~nut_pminrl2->module~time_module module~carbon_module carbon_module module~organic_mineral_mass_module->module~carbon_module module~soil_module->module~carbon_module 
~ ~ ~ PURPOSE ~ ~ ~
this subroutine computes p flux between the labile, active mineral
and stable mineral p pools.  
this is the alternate phosphorus model described in Vadas and White (2010)
~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
Intrinsic: Min
~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~

loop through soil layers in this HRU make sure that no zero or negative pool values come in Convert kg/ha to ppm so that it is more meaningful to compare between soil layers **Soluble - Active Transformations**

Dynamic PSP Ratio PSP = -0.045log (% clay) + 0.001(Solution P, mg kg-1) - 0.035(% Organic C) + 0.43 Limit PSP range Calculate smoothed PSP average Store PSP for tomrrows smoothing calculation **Dynamic Active/Soluble Transformation Coeff******

on day 1 just set to a value of zero days since P Application days since P deficit Calculate P balance P imbalance

Move P between the soluble and active pools based on Vadas et al., 2006 Net movement from soluble to active Calculate Dynamic Coefficant
limit rate coeff from 0.05 to .5 helps on day 1 when a_days is zero add a day to the imbalance counter Net movement from Active to Soluble
Calculate Dynamic Coefficant limit varc from 0.1 to 1 add a day to the imbalance counter ** Active - Stable Transformations ** Estimate active stable transformation rate coeff original value was .0006 based on linear regression rate coeff = 0.005 @ 0% CaCo3 0.05 @ 20% CaCo3 Estimate active/stable pool ratio Generated from sharpley 2003 Store todays ssp for tomarrows calculation *** Account for Soil Water content, do not allow movement in dry soil**** range from 0-1 1 = field cap If total P is greater than 10,000 mg/kg do not allow transformations at all Allow P Transformations Add water soluble P pool assume 1:5 ratio based on sharpley 2005 et al

Arguments

None

Calls

proc~~nut_pminrl2~~CallsGraph proc~nut_pminrl2 nut_pminrl2 alog alog proc~nut_pminrl2->alog