The Difference of Cation Uptake of Soybean Root

Abstract

The interactions of ions in salinity soil solution are factors determining ion uptake by roots. To clarify the relationship between these parameters, differences in uptake due to root washing in solutions of Na⁺, K⁺, Ca²⁺ and Mg²⁺, were studied by the method reported previously.
The transpiration stream concentration factor was found to be nuity in all case. Exudation differed according to the cations, and decreased in CaCl₂. The opposite was noted in all other cases. These findings were shown in relation to K+ concentration in roots. The each cation would thus appear to be a determinant of uptake.