Abstract
Application of the radionuclide ( 134 Cs) early in the growing season (growth stage II; plant establishment) resulted in low 134 Cs activity concentration in potato tubers across sampling occasions (range 12–130 Bq · kg -1 dry weight (D.W.) for 3 years). Following radionuclide deposition in the middle of the growing season (growth stage III; tuber initiation), 134 Cs activity concentration in tubers across sampling occasions was found to be highest (range 182–870 Bq · kg -1 D.W. for 3 years). When the radionuclide was sprayed on at later stages (growth stage IV = tuber bulking), 134 Cs activity concentrations in tubers across sampling dates decreased (range 70–310 Bq · kg -1 D.W. for 3 years). Deposition in the second half of August (late growth stage, tuber maturation) resulted in yet lower 134 Cs activity concentration in tubers.
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