Water stress — fW • growR

Threshold function representing growth limitation due to water stress.

Usage

fW(W, PET)

W: Water stress given as the ratio of water reserves to water holding capacity.
PET: Potential evapotranspiration in mm per day.

A value in the range (0, 1), acting as a multiplicative factor to plant growth.

After equation (6) in McCall et al. (2003).#'

McCall DG, Bishop-Hurley GJ (2003). “A Pasture Growth Model for Use in a Whole-Farm Dairy Production Model.” Agricultural Systems, 76(3), 1183–1205. ISSN 0308-521X, doi:10.1016/S0308-521X(02)00104-X , https://www.sciencedirect.com/science/article/pii/S0308521X0200104X.

fW(0.5, 7)
#> [1] 0.5
fW(0.5, 5)
#> [1] 0.8
fW(0.5, 3)
#> [1] 0.975