Table I.

Acronyms for models and definitions of symbols used in mathematical modeling

Acronym		Boundary Condition
EE		External water source Equilibrium
EASE		External water source and Apoplastic Solutes near the Exterior
PEWS		Phloem and External Water Sources
Symbol	Physical Significance	Units
L	Relative elemental growth rate	h−1
	Growth velocity vector	mm h−1
	Water flux vector	mm h−1
	Hydraulic conductivity tensor	mm2 s−1 MPa−1
Ψ	Total water potential	MPa
	Unit normal to the surface
s	Control surface	mm2
V	Control volume	mm3
r	Radial coordinate	mm
z	Longitudinal coordinate	mm
x, y	Cartesian coordinates	mm
J	Jacobian Matrix of Transformation