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水中的二价铁离子是一种活性高子，主要以FeO和Fe（OH）2：形式溶解于水中，这种化合物非常不稳定，但快被氧化变成三价铁，并产生沉淀．水稻的间接和根部由于茎管狭小，是其沉积的有利场所，当这种沉积达到一定程度后，使水稻不能正常生长．
Ferrous iron in water is an active high, dissolved mainly in the form of FeO and Fe (OH) 2: This compound is very unstable, but is rapidly oxidized to ferric and precipitates. The indirect and root of rice is a favorable place for its deposition due to the narrow stem, which can make the rice not grow normally when the deposition reaches a certain extent.