V. Gayatonde, J. P. Shahi, K. Srivastava, V. P. Raj Combining ability, maize, hybrids, inbreds, water logging 95-105 5 (4 ) 2021 October 2021 A full diallel analyses of 9 x 9, was made during 2016 Rabi season and evaluated under water-logging condition during Kharif 2017 and normal condition during Rabi 2017-18 in RCBD design in the Agriculture research farm , BHU, Varanasi. Remarkable genetic variability has been observed. The means of secondary traits viz., ASI, nodes and with brace roots indicated a strong relationship with grain yield which suggests that both additive and non-additive gene actions are important for water-logging tolerance in maize. Maximum average change was observed by the characters brace roots per plant, total nodes bearing brace roots, leaf area and 100 seed weight. A narrow difference was observed for percent protein and TSS. The yield traits like 100 seed weight (2.06 % reduction) and declined yield of about 0-45 % has been recorded. An overall 1-3 % reduction in protein, 0.2-1.2 percent increase in sugar, 0.3-10.5 % increased starch content has observed. There were about 10-11% increase in brace roots has also recorded. Among the inbreds HKI-193-1 and HKI 1105 showed better response for various characters under waterlogging, HKI 193-1 x PBNI 3-1, PBNI 3-1 x HKI 193-1, PBNI 3-1 x CML-161, HKI 193-1 x HUZM-152, HKI 193-1 x CML 163 and HKI 193-1 x HKI 1105 cross combination showed promising response and minimum yield loss. The cross combinations expressed better as compared to their parental lines.