Vol. 9, Special Issue 11, Part G (2025)

The present investigation on heterosis and inbreeding depression was conducted on 16 genetically diverse parental lines and five testers following the line x tester mating design. During Rabi season 2023-24 and 2024-25, twenty-one parents, 80 F1s, and 80 F2s were sown (25 November) in normal and late (25 December) conditions in Randomized Block Design (RBD) with three replications at Nawabganj Farm, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, (U.P.). Heterosis and inbreeding depression were studied for 13 yields and their contributing traits. Significant positive heterosis was observed for grain yield over the better parent for K-9351 × HD-2967 (51.97) and K-8962 × PBW-833 (55.57), and heterosis over the economic parent (K-1317) was observed for DBW-222 × PBW-833 (70.47) and PBW-644 × HD-2967 (73.48). Inbreeding depression was K-307 × DBW-187 (-32.88) and K-1006 × DBW-107 (-27.76) under early sown conditions. Significant positive heterosis was observed for grain yield over the better parent, K-9351 × HI-1563 (49.27), and K-9465 × PBW-833 (34.16). Heterosis over the economic parent (K-1317) was DBW-252 × DBW-187 (40.44) and K-9006 × DBW-187 (26.45). Inbreeding depression was lowest for DBW-222 × HD-2967 (-12.52) and DBW-252 × PBW-833 (-5.48) under late-sown conditions.