Definition of variables

Ad Soil water content when air dry (g/g) BD bulk density (g/cm3) Carb Amount of carbohydrates in fresh organic matter (kg/ha) Cell Amount of cellulose in fresh organic matter (kg/ha) CNR C/N ratio of fresh organic matter DCarb Rate of carbohydrate decomposition (1/d) DCell Rate of carbohydrate decomposition (1/d) DLayer Depth of soil layer (cm) DLign Rate of lignin decomposition (1/d) DMinr mineralization rate for soil organic matter (kg N/ha/day) Doy Day of the Year Dul Drained Upper Limit of soil water content (g/g) Fac Factor to convert ppm to kg/ha Fom Fresh organic matter at any time during simulation (kg/ha) Fon Fresh organic N at any time during simulation (kg N/ha) GRCom gross daily decomposition (carb+cell+lign; kg/ha/day) GRCom1 Daily decomposition of carbohydrates (kg/ha/day) GRCom2 Daily decomposity of cellulose (kg/ha/day) GRCom3 Daily decomposition of lignin (kg/ha/day) GRNom Daily release of N (carb+cell+lign; kg N/ha/day) GRNom1 Daily release of N from carbohydrates (kg N/ha/day) GRNom2 Daily release of N from cellulose (kg N/ha/day) GRNom3 Daily release of N from lignin (kg N/ha/day)

Hum Humus in soil (kg/ha) IN Initial inorganic N (mg N/kg) INkg Initial inorganic N (kg N/ha) Lign Amount of lignin in fresh organic matter (kg/ha) Mfac Soil moisture factor (0-1) NHum N in humus (kg N/ha) OC Organic carbon (%) PerCarb Percent Carbohydrates in cover crop PerCell Percent of Cellulose in cover crop PerLign Percent of Lignin in cover crop RHMin Daily Amount of humus mineralized (kg/ha/day) Rnac Daily amount of N immobilized (kg N/ha/day) RnaCum Cumulative amount of N immobilized (kg N/ha) Sat Saturation water content (g/g) St Soil temperature (oC) SumNNom Cumulative Net N mineralized from cover crop and humus (kg N/ha) Sw Soil water (g/g) Tfac Temperature Factor (0-1) TrhMin Cumulative amount of humus mineralized (kg/ha)