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Fig. 4. Growth stage: pollen shed. Activities of 54Mn, 65Zn, 57Co, and 134Cs measured in the unstained soil matrix, in the stained preferential flow paths, and in the 2-cm fringe just outside the stained flow paths. Samples were taken at harvest time when plants reached pollen shed. Means and standard errors are given. The symbols *, **, and *** indicate significance at the 0.05, 0.01, and 0.001 probability levels, respectively; NS is not significant at the 0.05 probability level and ND is not detectable.
