除染後水田における玄米への放射性セシウムの移行係数

日本作物学会紀事

石川 哲也⁴  神谷 隆³  牧野 知之²  中 達雄¹  青野 克己³  赤羽 幾子²  奥島 修二¹  太田 健⁴  江口 哲也⁴  松波 寿弥⁴  藤村 恵人⁴  村上 敏文⁴ 

[1] 農研機構農村工学研究所;農業環境技術研究所;太平洋セメント株式会社;農研機構東北農業研究センター

关键词: 移行係数;    カリ肥料;    玄米;    除染;    水稲;    放射性セシウム;    Transfer factor;    Potassium content;    Brown rice;    Decontamination;    Rice;    Radiocesium;   

DOI  :  10.1626/jcs.85.211

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Paddy fields contaminated with radionuclides released from the Tokyo Electric Power Company's Fukushima Daiichi Nuclear Power Plant were decontaminated between 2012 and 2014 by removal or cleaning of the surface layer of soil. The effects of application of potassium fertilizer and soil amendment (zeolite) on the radiocesium concentration in brown rice, rice growth and grain yield of rice grown in these paddy fields were examined. The concentrations of radiocesium in soil and brown rice were decreased by the decontamination, but the ratio of decrease differed with the fields. Transfer factors (TF) from soil to brown rice (ratio of radiocesium concentration in brown rice to that in the soil) were related to the exchangeable potassium (Ex-K) concentration in the collected soil at harvest, excluding the irregular data. This relationship in decontaminated plots was not distinguishable from that in non-decontaminated plots. This suggested that the field management maintaining a high Ex-K concentration in soil should be applied to inhibit the uptake of radiocesium by rice in decontaminated paddy fields as well as in non-decontaminated paddy fields. The application of zeolite increased the Ex-K concentration in soil and this effect was observed even in the following season. Available nitrogen concentration in soil was decreased by the decontamination and the negative relationship was observed between the available nitrogen concentration and grain yield. This suggested that additional nitrogen fertilizer should be applied to the paddy field when the available nitrogen concentration was decreased by decontamination.

【 授权许可】

Unknown