A field experiment was carried out at the Agricultural College & Research Institute, Coimbatore in research farm during samba season 2018-2019 to assess the water use  and its efficiency in different rice varieties comprising aromatic rice, land races, popular cultivars and recent released variety under modified irrigation practices. The experimental design was a split plot with three replications. The main plots with contionous flooding and modified irrigation practices and  sub plots with eight varieties as treatments viz., (S1) Kalanamak, (S2) Jeeragasamba, (S3) Kavuni, (S4) Mappilaisamba, (S5)Improved TNAU White ponni, (S6) Bhavani, (S7) CO 51 and (S8) CO 52. Irrigation practice of alternate wetting and drying, monitoring with field tube registered lower consumption of water (900 mm) with less number of irrigation(14), higher water use efficiency (7.3 kg ha-1mm-1) and water productivity (1682 lit.kg-1) in rice, compared to flood irrigation practices. In Sub plot with different rice varieties viz., aromatic, landraces, popular cultivar and recently released rice variety among these varieties the recent released variety CO52 recorded higher grain yield (6.6 t ha-1), compared to other varieties.

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Field experiment were carried out in the experimental research farm, Agricultural College and Research Institute, Coimbatore during Samba season in the year 2018-2019 to study the physiological parameters of rice varieties under flooding irrigation and alternate wetting and drying (AWD) irrigation practices. The experiment was laid out in a split plot design with three replication. The treatments comprised of two irrigation management viz., (M1) Flood irrigation and (M2) Alternate wetting drying respectively in main plot and Subplot eight varieties viz., (S1) Kalanamak, (S2) Jeeragasamba, (S3) Kavuni, (S4) Mappilaisamba, (S5) Improved TNAU White ponni, (S6) Bhavani, (S7) CO 51 and (S8) CO 52. The results of this study showed that the positive impact of higher photosynthetic rate and specific leaf weight; lower transpiration rate and proline content of leaves were observed with AWD irrigation management with SRI practice.

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