In conclusion, the level of chlorophyll a and total chlorophyll pigments in RD6 rice grown in saline soil (2% salt level) treated with OM was higher than in the control (without OM), resulting in improved photosynthetic abilities. Net-photosynthetic rate (Pn) in the salt-stressed leaves was strongly related to total grain weight, so, OM treatment in paddy fields could effectively alleviate the problem of soil salinity, resulting in yield improvement.