Minimum value used for the time period before
doy.incr.
minval_after_decr
Minimum value used for time period after
doy.decr.
maxval
Maximum value.
doy.incr
Day of year when increasing from minval_before_incr to
maxval begins.
doy.max
Day of year when maxval is reached.
doy.min
Day of year when minval_after_decr is reached.
shape.incr
Shape parameter of the increasing phase.
shape.decr
Shape parameter of the decreasing phase.
maxdoy
Length of the year, 366 for leap years, 365 for normal years.
References
Jansson, P.-E. & Karlberg, L. (2004): "Coupled heat and mass transfer model for
soil-plant-atmosphere systems."
Royal Institute of Technolgy, Dept of Civil and Environmental Engineering Stockholm