Dear Florence , there could be a possibility of some relation salinity tolerance and iron toxicity in rice . The presence of salinity, I feel will reduce the toxic level of iron to accumulate in the soil under paddy grown preferably under waterlogged conditions. Greater is the salinity of the soil , lesser will be the ferrous iron to accumulate , since salinity -induced oxidation of iron will be more pronounced , but waterlogging will gradually neutralize the effect of salinity depending upon the texture and duration of submergence .