Investigation of the root‐soil interface environment of soybean roots showed an accumulation of HCO 3 and an increase in pH as compared to the original soil. The magnitude of the HCO 3 accumulation and pH increases was related to the NO 3 level of the soil solution. This effect was attributed to a greater uptake of anions than cations by the plant so that HCO 3 release maintained electrical neutrality. The pH increased by as much as one unit and HCO 3 accumulation was as great as 35 meq/100 g of dry roots.
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Riley et al. (1969) studied this question.