Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 67(3): 93-100 (2018)

技術報告Technical Report

バーミキュライト質土壌におけるカリウムの吸着および移動特性Adsorption and Transport Behaviors of Potassium in Vermiculitic Soils

1東京大学大学院農学生命科学研究科Graduate School of Agricultural and Life Sciences, The University of Tokyo ◇ 113–8657 東京都文京区弥生 1–1–1 ◇ 
1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan

2農業・食品産業技術総合研究機構東北農業研究センター福島研究拠点Agricultural Radiation Research Center, National Agriculture and Food Research Organization (NARO) Tohoku Agricultural Research Center ◇ 960–2156 福島県福島市荒井字原宿南50 ◇ 50 Harajukuminami, Arai, Fukushima-shi, Fukushima Pref. 960–2156, Japan

3福島県農業総合センターFukushima Agricultural Technology Centre ◇ 963–0531 福島県郡山市日和田町高倉字下中道116 ◇ 116 Shimonakamichi, Takakura, Hiwada-Machi, Koriyama-shi, Fukushima Pref. 963–0531, Japan

受付日:2017年4月19日Received: April 19, 2017
受理日:2017年10月4日Accepted: October 4, 2017
発行日:2018年3月15日Published: March 15, 2018


It is important to understand potassium (K) behavior in soils since K fertilization is one of the most effective countermeasures to reduce the radiocaesium (RCs) uptake by crops. The K behavior in soils is highly influenced by the clay mineral composition. In this study, we investigated the K behavior for non-vermiculitic and vermiculitic nature of soils at Fukushima Prefecture in Japan. In the adsorption experiments, vermiculitic nature of soils exhibited more adsorption of K onto the soils as compared to non-vermiculitic nature of soil. One dimensional column transport experiments using 42K as a radioisotope tracer showed that almost similar K mobility for all soils as supported by adsorption isotherms of K. However, percentage of exchangeable K in the total K retained in the soil was higher in non-vermiculitic nature of soil, while the percentage of fixed K was higher in vermiculitic nature of soils. Thus, the existence of vermiculite with high K fixation capacity was suggested to reduce K retention as an exchangeable form in vermiculitic nature of soils.

Key words: potassium; vermiculitic soils; adsorption; transport behavior; potasium-42

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