Root Density and Water Potential Gradients near the Plant Root

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Abstract
The models of Gardner (1960) and Cowan (1965) for water transfer to the plant root are used to estimate the differences in water potential between the root and the bulk soil for a wide range of root densities and water extraction rates at a series of matric potentials for a Yolo light clay. For root densities and extraction rates reported both in the literature and in this paper there is good evidence to suggest that the large potential gradients originally predicted by Gardner and Cowan are restricted to situations involving very low root densities and high extraction rates in relatively dry soil.

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