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Intensification of arsenic toxicity to paddy rice by hydrogen sulfide and ferrous iron 2. effects of ferric sulfate and ferric hydroxide application on arsenic toxicity to rice plants



Intensification of arsenic toxicity to paddy rice by hydrogen sulfide and ferrous iron 2. effects of ferric sulfate and ferric hydroxide application on arsenic toxicity to rice plants



Soil Science and Plant Nutrition 26(4): 571-580



The effect of application of Fe material on the combined toxicity of As and ferrous Fe to paddy rice was examined in soil culture experiments using Fe2(SO4)3 and Fe(OH)3 in combination with As and rice straw powder as reducing agent. The growth and yield of rice plants were greatly reduced by additions of As and rice straw powder, but the application of both iron materials showed no substantial alleviative effect on the growth inhibition. Application of Fe2(SO4)3 intensified the growth inhibition by As with the occurrence of bronzing symptoms in the injured plants, whereas that of Fe(OH)3 alleviated to some extent the toxicity of As without the development of any bronzing symptoms. The bronzed plants accumulated high amounts of Fe in their tissues. H2S formation was detected in soil applied with Fe2(SO4)3 and rice straw powder after incubation. In the inhibition process, the toxicity of H2S formed from sulfate may combine with that of As and injure the plant further, perhaps inducing ferrous iron toxicity also.

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Accession: 005718037

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