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Bicarbonate Accumulation and pH Changes at the Soybean (Glycine max (L.) Merr.) Root-Soil Interface¹

ABSTRACT

Investigation of the root-soil interface environment of soybean roots showed an accumulation of HCO₃ and an increase in pH as compared to the original soil. The magnitude of the HCO₃ accumulation and pH increases was related to the NO₃ level of the soil solution. This effect was attributed to a greater uptake of anions than cations by the plant so that HCO₃ release maintained electrical neutrality. The pH increased by as much as one unit and HCO₃ accumulation was as great as 35 meq/100 g of dry roots.

¹ Journal Paper no. 3628, Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy. This study was supported in part by the Crops Research Division, Agricultural Research Service, US Department of Agriculture, under Cooperative Agreement number 12-14-100-8463 (34) with Purdue University. Presented before Div. S-4, Soil Science Society of America, Nov. 12, 1968.

² Research Associate and Professor of Agronomy, Purdue University, respectively.

Received for publication April 10, 1969. Accepted for publication July 18, 1969.