fW {growR}

Water stress

Description

Threshold function representing growth limitation due to water stress.

Usage

fW(W, PET)

Arguments

W

Water stress given as the ratio of water reserves to water holding capacity.

PET

Potential evapotranspiration in mm per day.

Details

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

Value

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

References

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.

Examples

fW(0.5, 7)
fW(0.5, 5)
fW(0.5, 3)