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Comparative dynamics of potassium and radiocesium in soybean with different potassium application levels
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| Title: | Comparative dynamics of potassium and radiocesium in soybean with different potassium application levels |
| Authors: | Matsunami, Hisaya Browse this author | | Uchida, Tomoko Browse this author | | Kobayashi, Hiroyuki Browse this author | | Ota, Takeshi Browse this author | | Shinano, Takuro Browse this author →KAKEN DB |
| Keywords: | Comparative dynamics | | Potassium | | Radiocesium | | Soybean |
| Issue Date: | Jul-2021 |
| Publisher: | Elsevier |
| Journal Title: | Journal of environmental radioactivity |
| Volume: | 233 |
| Start Page: | 106609 |
| Publisher DOI: | 10.1016/j.jenvrad.2021.106609 |
| Abstract: | We conducted a field experiment in soybean with different levels of K application to elucidate the comparative dynamics of 137Cs and K. The inventory of K in the shoots increased substantially from the fifth trifoliate stage to the full seed stage, and as the absorption of K increased, so too did the absorption of 137Cs. Overall, the effect of K application was much greater in terms of 137Cs dynamics than K dynamics or biomass production. K application reduced not only the accumulation of 137Cs in the shoots, but also the distribution of 137Cs to the grains. However, the decrease of 137Cs distribution to the grain had a much smaller effect on 137Cs accumulation in the grains than 137Cs absorption. A positive correlation was also observed between the exchangeable 137Cs/K ratio in the soil and the 137Cs/K ratio in the shoots for each growth stage, and the 137Cs/K ratios in the shoots at the full seed and full maturity stage were much higher than those at the fifth trifoliate and full bloom stage under the same exchangeable 137Cs/K ratio in the soil. These findings suggest a decrease in the discrimination of 137Cs from K during absorption after the full bloom stage. As a result of this and the increase in soil-exchangeable 137Cs/K with growth, radiocesium was more transferable to the shoots after the full bloom stage. Overall, these results suggest that lowering the soil-exchangeable radiocesium/potassium ratio after the full bloom stage by increasing K availability could efficiently reduce the transfer of radiocesium to the grains. |
| Rights: | © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/90115 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 信濃 卓郎
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