AUFERT - Key for automatic fertilization:
AUFERT = 0.0: No automatic fertilization.
AUFERT < 1.0: Automatic fertilizer may be applied to remove some nutrient stress without increasing nutrient concentration above the minimum level; the value of AUFERT is the fraction of potential C production (temperature and moisture limited) which will be maintained.
AUFERT > 1.0: Automatic fertilizer may be applied to remove nutrient stress and increase nutrient concentrations above the minimum level; a value of AUFERT between 1.0 and 2.0 determines the extent to which nutrient concentration is maintained between the minimum and maximum levels.
AUFERT = 2.0: Automatic fertilizer may be applied to remove nutrient stress and increase nutrient concentrations to the maximum level.
Valid Range: 0.0 to 2.0
FERAMT(1) - Amount of N to be added in scheduled month (g m-2).
Valid Range: 0.0 to 9999.0
FERAMT(2) - Amount of P to be added in scheduled month (g m-2).
Valid Range: 0.0 to 9999.0
FERAMT(3) - Amount of S to be added in scheduled month (g m-2).
Valid Range: 0.0 to 9999.0
NO3FRAC - (DayCent5 only) Fraction of N to be added as NO3. The remainder is added as NH4.
Valid Range: 0.0 to 1.0