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Effect of Simultaneous K and Ca Application to Paddy Soil on the Uptake of Radiocaesium and Radiostrontium by Rice
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 Title & Authors
Effect of Simultaneous K and Ca Application to Paddy Soil on the Uptake of Radiocaesium and Radiostrontium by Rice
Choi, Yong-Ho; Lim, Kwang-Muk; Jun, In; Keum, Dong-Kwon; Kim, In-Gyu;
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A radio-tracer experiment was performed in a greenhouse to investigate the effectiveness of the simultaneous application of K and Ca as a countermeasure for reducing the radiocaesium and radiostrontium uptake by rice. Paddy soil (loam of pH 6.5) in soil boxes was spiked with and , and treated with K and Ca in the forms of KCl and , respectively, at agrochemical grades before transplanting. For the seeds of the control plants, soil-to-plant transfer factors (TF, ) of and were and , respectively, whereas the corresponding values for the straws were and , respectively. The TF values of and kept decreasing as the level of the simultaneous application of K and Ca (K/Ca, ) increased up to 33.6/322 and 48.0/460, respectively. The maximum rate of the decrease was around 60% for both radionuclides. Nearly 60% reduction in the TF value of was observed even at the dosage of 33.6/322, which was considered the optimum dosage based on crop productivity as well as reduction in the radiocaesium and radiostrontium uptake by rice. The optimum dosage may depend on various factors so further experiments need to be made for many different conditions.
 Cited by
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