R. J. Dunham, P. H. Nye, The Influence of Soil Water Content on the Uptake of Ions by Roots. I. Soil Water Content Gradients Near a Plane of Onion Roots, Journal of Applied Ecology, Vol. 10, No. 2 (Aug., 1973), pp. 585-598
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Dunham et al. (1973) studied this question.
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