Increasing levels of sodicity (pH2 7.5 to 10.0) adversely affected shoot weight and grain yield of 11 rice varieties. CSR-1, CSR-1 mutant and H3–14 were the most tolerant whereas PAU-21-88-5 and Jaya the least tolerant to sodicity. All the varieties showed an increase in Na and decrease in K in shoot with increasing sodicity stress. This trend was found at 30 and 60 days after transplanting and also at maturity. Highest K and Na concentrations in shoot were noted at 30 days after transplanting and at maturity respectively. Tolerant varieties had low Na and Na/K ratio and high K, but not without overlapping response. However, distinction based on these characters were more sharp at 30 days after transplanting than at 60 days after transplanting and at maturity. Further per unit increase in Na in shoot at early growth stage was more deleterious to grain yield compared to latter stage.
