The Increase in the Arsenic Concentration in Brown Rice Due to High Temperature during the Ripening Period and Its Reduction by Silicate Material Treatment

Protima Dhar, Kazuhiro Kobayashi, Kazuhiro Ujiie, Fumihiko Adachi, Junko Kasuga, Ikuko Akahane, Tomohito Arao and Shingo Matsumoto
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Protima Dhar: The United Graduate School of Agricultural Sciences, Tottori University, 101-4, Koyama-cho-minami, Tottori 680-8550, Japan
Kazuhiro Kobayashi: Faculty of Life and Environmental Sciencees, Shimane University, 1060, Nishikawatsu-cho, Matsue, Shimane 690-8504, Japan
Kazuhiro Ujiie: Faculty of Life and Environmental Sciencees, Shimane University, 1060, Nishikawatsu-cho, Matsue, Shimane 690-8504, Japan
Fumihiko Adachi: Faculty of Life and Environmental Sciencees, Shimane University, 1060, Nishikawatsu-cho, Matsue, Shimane 690-8504, Japan
Junko Kasuga: Faculty of Life and Environmental Sciencees, Shimane University, 1060, Nishikawatsu-cho, Matsue, Shimane 690-8504, Japan
Ikuko Akahane: Institute for Agro-Environmental Science, National Agriculture and Food Research Organization, 3-1-3, Kannondai, Tsukuba, Ibaraki 305-8604, Japan
Tomohito Arao: National Agriculture and Food Research Organization; 2-1-18, Kannondai, Tsukuba Ibaraki 305-8666, Japan
Shingo Matsumoto: Faculty of Life and Environmental Sciencees, Shimane University, 1060, Nishikawatsu-cho, Matsue, Shimane 690-8504, Japan

Agriculture, 2020, vol. 10, issue 7, 1-16

Abstract: We investigated the effect of temperature during the ripening period on the rice yield and arsenic (As) concentration in brown rice, using temperature gradient chambers (TGCs). Rice grown in Wagner pots (1/5000a) was placed in three TGCs (each TGC was set at four temperature levels: ambient, mildly-high temperature, moderately-high temperature, and super-high temperature) from one week after heading until harvest. In the TGCs, a range of mean air temperatures was observed in the range of 2 °C above the ambient temperature. There was a significant negative correlation between the brown rice yield and the air and soil temperatures, and the increase in air and soil temperatures resulted in a decrease in the yield. The reduction in yield was significantly mitigated by the application of calcium silicate. The concentration of As in the brown rice was significantly positively correlated with the air and soil temperature, and the concentration of As increased with increasing air and soil temperatures. When calcium silicate was applied, the concentration of As in brown rice was significantly lower at all temperature ranges, and its application was effective in reducing the arsenic concentration even at high temperatures. These results suggest that the application of silicate material may help mitigate the decrease in yield and the increasing As concentration in brown rice even under high-temperature conditions.

Keywords: arsenic; calcium silicate; dimethyl arsenic acid; high temperature; inorganic arsenic; rice; temperature gradient chamber (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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