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The experiment was carried out at the Instructional Farm of Faculty of Agricultural Engineering, BCKV, Nadia, West Bengal during the year of 2016-17. The study was conducted with the objectives to determine the water requirements of Brinjal cultivation under drip irrigation and and yield of Brinjal cultivation under drip irrigation. In the study, there were four irrigation treatments with four replications. The different irrigation treatments were (i) T₁-Conventional (1.1 ET + mulch), (ii) T₂-0.5 E_Pan under drip irrigation with mulch,(iii) T₃-0.6 E_Pan under drip irrigation with mulch and (iv) T₄-0.8 E_Pan under drip irrigation with mulch. It was observed that the irrigation water requirement has found to be lowest at T₂-0.5 E_Pan treatments (12cm) under drip irrigation and highest irrigation water requirement at T₁-Conventional (1.1 ET + mulch) treatment (30cm).  The average yield at T1, T2, T3 and T4 treatments was found 41.76 t/ha, 81.28 t/ha, 69.26 t/ha and 70.79 t/ha respectively. It was also observed that the water use efficiency was found to be the highest at T₂-0.5 E_Pan treatments of drip irrigation was 6.77 t/ha- cm among the all treatments. This indicated that the average yield and WUE were found more under the drip system in compare to conventional system. Due to the decreasing availability of water resources and the increasing competition for water between different users, improving agricultural water use efficiency is vitally important in many parts of the world that have limited water resources. Drip irrigation in brinjal in pots is found much water saving practice. Drip irrigation itself is most water saving technique and cultivating the crops in pots with mulch, further add to water saving since there is possibility of using entire rain water and less evaporation loss.

Key words: Drip irrigation, Mulch cover, Evapotranspiration, Water use Efficency.