Abstract
A new attempt to define the volumetric sink term added to the continuity equation for soil-water flow and describing plant water uptake by roots is proposed here. This sink function allows the introduction of plant parameters and the calculation of the actual transpiration rate as a function of time given a pedologic, climatic and cultural situation. This new definition considers physical principles that let us describe a given soil-plant system with more parameters. Apart from the analysis of irrigation problems and devices for which this model is designed, one can easily use it to approach other problems related to the unsaturated zone like natural or artificial recharge of the groundwater table and its relations with the vegetation.
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