Mean grain yield of eight genotypes under wet season was nearly 56 per cent less compared to that under dry season. The reduction in grain yield was due to a decrease in incident solar radiation and its utlization efficiency (Eu%), assimilation rates (DM/LAD), harvest index and total dry matter accumulation. Low LAI genotypes maintained relatively greater Eu % (for dry matter production) and DM/LAD compared to high LAI genotypes in both the seasons. It is suggested that, the DM/LAD in combination with an optimum LAI can be considered as an important trait in improving grain yields of rice under wet seasons.
