Abstract
We propose here a method, applicable to the whole canopy, for determining the critical value of leaf water potential ψ FC at which stomata begin to close. This method combines the simulation of leaf water potential by means of a model of transfer in the soil-plant system with the simulation of stomatal resistance by means of Bowen's ratio. These simulations necessitate, for the most part, physical measures which can be recorded. After experimental verification, we observed that the simulated ψ FC values correspond well to those obtained by conventional methods, and then that ψ FC values observed throughout the growth cycle of the potato crop remain practically stable ( ψ FC = −0.95 MPa).
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