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Fig. 6. Growth stage: pollen shed. Relation between brilliant blue and the concentration of radionuclides in the three soil compartments: preferential flow paths; 2-cm fringe just outside the stained flow path areas; soil matrix; each point represents the average of the soil samples taken on horizontal profiles at 15-, 18-, 20-, 35-, 38-, and 40-cm depth. Samples were taken at harvest time when plants reached pollen shed. r denotes the Pearson product-moment correlation coefficient.
