The effect of fertilization on cesium concentration of rice grown in a paddy field in Fukushima Prefecture in 2011 and 2012
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After the accident of the Fukushima 1 nuclear power plant in March 2011, radioactive cesium was released and paddy field in a wide area of Fukushima Prefecture was contaminated. To reduce radioactive Cs uptake by rice, it is important to understand factors that affect Cs uptake in rice. Here we describe our study in 2011 and 2012 to investigate Cs concentration in two rice cultivars, Koshihikari and Hitomebore, the top two cultivars in Fukushima prefecture, grown under different fertilizer conditions in the contaminated paddy field. Our study demonstrated that high nitrogen and low potassium conditions increase Cs concentrations both in straw and brown rice.
KeywordsRadioactive cesium Fertilizer Rice Fukushima 1 nuclear power plant accident
We greatly appreciate Prof. Yuichi Onda at Tsukuba University and Mr. Shuhei Kanno for cultivating the rice in the paddy field and maintenance of the rice field. This work is supported in part by a grant from the Mitsui & Co., Ltd., Environment Fund and a Grant-in-Aid for the Scientific Research on Innovative Areas from Japan Society for Promotion of Science (no 24110007).
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