Nutrient Balance

Nutrient balance output can be printed at basin, LSU, HRU, and HRU-lte level by entering "y" in the basin_nb, lsunit_nb, hru_nb, and hru-lte_nb lines in print.prt, respectively. Nutrient balance output can be printed at daily, monthly, yearly, and average annual time steps. The names of the nutrient balance output files are as follows:

• basin_nb_day.txt

• basin_nb_mon.txt

• basin_nb_yr.txt

• basin_nb_aa.txt

• lsunit_nb_day.txt

• lsunit_nb_mon.txt

• lsunit_nb_yr.txt

• lsunit_nb_aa.txt

• hru_nb_day.txt

• hru_nb_mon.txt

• hru_nb_yr.txt

• hru_nb_aa.txt

Field	Description	Unit
jday	Julian day	n/a
mon	Month	n/a
day	Day of the month	n/a
yr	Year	n/a
unit	ID of the object	n/a
gis_id	Object ID in GIS	n/a
name	Name of the object or SWAT+ setup (basin outputs)	n/a
grzn	Total nitrogen added to soil from grazing	kg/ha
grzp	Total phosphorus added to soil from grazing	kg/ha
lab_min_p	Phosphorus moving from the labile mineral pool to the active mineral pool	kg/ha
act_sta_p	Phosphorus moving from the active mineral pool to the stable mineral pool	kg/ha
fertn	Total nitrogen applied to soil through fertilization	kg/ha
fertp	Total phosphorus applied to soil through fertilization	kg/ha
fixn	Nitrogen added to plant biomass via fixation	kg/ha
denit	Nitrogen lost from nitrate pool by denitrification	kg/ha
act_nit_n	Nitrogen moving from active organic pool to nitrate pool	kg/ha
act_sta_n	Nitrogen moving from active organic pool to stable pool	kg/ha
org_lab_p	Phosphorus moving from the organic pool to labile pool	kg/ha
rsd_nitorg_n	Nitrogen moving from the fresh organic pool (residue) to the nitrate (80%) and active organic (20%) pools	kg/ha
rsd_laborg_p	Phosphorus moving from the fresh organic pool (residue) to the labile (80%) and organic (20%) pools	kg/ha
no3atmo	Nitrate added to the soil from atmospheric deposition	kg/ha
nh4atmo	Ammonia added to the soil from atmospheric deposition	kg/ha
nuptake	Plant nitrogen uptake	kg/ha
puptake	Plant phosphorus uptake	kg/ha
gwtrann	Nitrate added to the soil from the aquifer (gwflow module)	kg/ha
gwtranp	Phosphorus added to the soil from the aquifer (gwflow module)	kg/ha