f(π), salinity stress function
nT, number of layers with roots (dimensionless)
ri(Δz), relative root distribution in soil layer i (dimensionless)
π(z), soil osmotic head (cm)
π(c), salinity half-rate (cm) [parameter: 3500, Karlberg et al. (2006); 2000, van Genuchten and Hoffmann (1984); Maas, 1986]
pπ, salinity power coefficient [parameter: 2, van Genuchten and Hoffmann, 1984]
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