2.3. Determination of Rb+and K+ Rb+and K+were analysed directly, either in the exuded xylem sap or after extraction from the root and shoot tissues,using atomic absorption spectrophotometry (PerkinElmer 1100 B). Two extrac- tion procedures were followed
2.3. Determination of Rb+and K+Rb+and K+were analysed directly, either in the exuded xylemsap or after extraction from the root and shoot tissues,using atomicabsorption spectrophotometry (PerkinElmer 1100 B). Two extrac-tion procedures were followed