title: Influence of the nonexchangeable potassium of mica on radiocesium uptake by paddy rice.
abstract: A pot cultivation experiment was conducted to elucidate the influence of the nonexchangeable potassium (K) of mica on radiocesium ((137)Cs) uptake by paddy rice (Oryza sativa L. cv. Koshihikari), and to evaluate the potential of mica application as a countermeasure to reduce radiocesium transfer from soil to paddy rice. The increase in the exchangeable K concentrations of soils, measured before planting, due to mica (muscovite, biotite, and phlogopite) application was negligible. However, in trioctahedral mica (biotite and phlogopite)-treated soil, the release of nonexchangeable K from the mica interlayer maintained the soil-solution K at a higher level during the growing season in comparison to the control, and consequently decreased the (137)Cs transfer factor for brown rice (TF). The sodium tetraphenylboron (TPB)-extractable K concentration of the soils, measured before planting, was strongly negatively correlated with the TF, whereas the exchangeable K concentration of the soils, also measured before planting, was not correlated with the TF. Therefore, we conclude that TPB-extractable K is more reliable than exchangeable K as a basis of fertilizer recommendations for radiocesium-contaminated paddy fields. Phlogopite-treated soils exhibited higher TPB-extractable K concentrations and lower TF values than biotite-treated soils. We thus conclude that phlogopite application is an effective countermeasure to reduce radiocesium uptake in paddy rice.
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan. Electronic address: tetsueguchi@affrc.go.jp.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Eguchi
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ohta
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ishikawa
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan.
authors.forename: Hisaya
authors.initials: H
authors.lastname: Matsunami
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan.
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Takahashi
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan.
authors.forename: Katashi
authors.initials: K
authors.lastname: Kubo
authors.affiliation: Soil Environment Division, National Institute for Agro-Environmental Sciences, Ibaraki 305-8604, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Yamaguchi
authors.affiliation: Soil Environment Division, National Institute for Agro-Environmental Sciences, Ibaraki 305-8604, Japan.
authors.forename: Nobuharu
authors.initials: N
authors.lastname: Kihou
authors.affiliation: Agricultural Radiation Research Center, NARO Tohoku Agricultural Research Center (NARO/TARC), Fukushima 960-2156, Japan.
authors.forename: Takuro
authors.initials: T
authors.lastname: Shinano
mesh_terms: D000538:Aluminum Silicates / Q000378:metabolism*; D002588:Cesium Radioisotopes / Q000378:metabolism*; D005296:Ferrous Compounds / Q000378:metabolism; D005308:Fertilizers / Q000032:analysis*; D007564:Japan; D012275:Oryza / Q000254:growth & development / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012990:Soil Pollutants, Radioactive / Q000378:metabolism*
chemical_list: D000538:Aluminum Silicates; D002588:Cesium Radioisotopes; D005296:Ferrous Compounds; D005308:Fertilizers; D012990:Soil Pollutants, Radioactive; C517971:muscovite; C047410:biotite; D011188:Potassium; C011934:mica
keywords: Mica; Nonexchangeable potassium; Paddy rice; Radiocesium transfer; Tetraphenylboron