In a recent paper, de Jong van Lier et al. (2006) developed a methodology to determine the limiting averaged soil pressure head and water content under which plant transpiration is reduced. They presented a numerical finite difference method describing the flow from soil to root and validated it by a derived analytical solution. However, we noticed an error in the derivation and final definition of their analytical solution (Eq. [45] in de Jong van Lier et al., 2006).

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To derive the analytical solution, the continuity equation describing water flow in the soil (Richards' equation) is approximated by steady-rate behavior,...
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