Abstract
This experiment was conducted to verify our previous observation that ferrous iron (Fe^<2+>) inhibited seedling emergence and establishment and to attempt prevention of Fe^<2+> harm. Paddy rice seeds coated with calcium peroxide (CaO_2) alone and with CaO_2 plus chemical which change Fe^<2+> into insoluble form were sown into flooded soil. Fe^<2+> (0, 150, 225 or 300mg/100g air-dried soil) was added to the soil prior to sowing. Seedling emergence and establishment tended to be more delayed and inhibited as the amount of added Fe^<2+> increased and especially when it exceeded 225mg. Chemicals which change Fe^<2+> into insoluble form (potassium hexacyanoferrate (III), potassium hexacyanoferrate (II)) brought certain improvement of seedling emergence and establishment, such as earlier seedling emergence.
