Possibility of hydrogen sulfide induced iron toxicity of the rice plant

Abstract

Hydrogen sulfide causes abnormalities of the rice plant (1), such as “akiochi” believed to be a result of hydrogen sulfide toxicity. The disease occurs on soils low in active iron and in which sulfide, produced by the reduction of sulfate under flooded conditions, remains in the soil solution at a considerable concentration because there is insufficient iron to form the sparingly soluble ferrous sulfide. Beyond a certain concentration, the sulfide in the soil solution injures the rice roots, leading to plant abnormality (2).