INTENSIFICATION OF ARSENIC TOXICITY TO PADDY RICE BY HYDROGEN SULFIDE AND FERROUS IRON : II. Effects of Ferric Sulfate and Ferric Hydroxide Application on Arsenic Toxicity to Rice Plants

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概要

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• The effect of application of iron material on the combined toxicity of arsenic and ferrous iron to paddy rice was examined in soil culture experiments using Fe_2(SO_4)_3 and Fe(OH)_3 in combination with arsenic and rice straw powder as reducing agent. The growth and yield of rice plants were greatly reduced by additions of arsenic and rice straw powder, but the application of both iron materials showed no substantial alleviative effect on the growth inhibition. However, application of Fe_2(SO_4)_3 intensified the growth inhibition by arsenic with the occurrence of bronzing symptoms in the injured plants, whereas that of Fe(OH)_3 alleviated to some extent the toxicity of arsenic without the development of any bronzing symptoms. The bronzed plants accumulated high amounts of iron in their tissues. H_2S formation was detected in soil applied with Fe_2(SO_4)_3 and rice straw powder after incubation. It is suggested therefore that in the inhibition process, the toxicity of H_2S formed from sulfate may combine with that of arsenic and injure the plant further, perhaps inducing ferrous iron toxicity also.

• 社団法人日本土壌肥料学会の論文

著者

• Tsutsumi Michio

  Faculty Of Agriculture Iwate University

• DUAH-YENTUMI Stephen

  Faculty of Agriculture, Utsunomiya University

• KURIHARA Kinkichi

  Faculty of Agriculture, Utsunomiya University

• Duah-yentumi Stephen

  Faculty Of Agriculture Utsunomiya University : (present Address) Faculty Of Agriculture Nagoya Unive

• Duah-yentumi Stephen

  Faculty Of Agriculture Nagoya University

• Kurihara Kinkichi

  Faculty Of Agriculture Utsunomiya University

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