All twenty two onion genotypes collected from various parts of the country expressed the significant variability for the growth and yield attributes. Among them eight genotypes proved to be significantly superior for bulb yield per hectare. The cultivar Bellary Red (56.72 t/ha) yielded significantly highest bulb yield per hectare. The highest yield expressed by Bellary Red cultivar was attributed to its higher leaf area (612.07 cm2), leaf area index (4.63) and average weight of bulb (84.15 g). Further the genetic variability studies revealed that the higher PCV, GCV and heritability for bulb yield and its attributes. The interrelationship of bulb yield was significantly positive with leaf area and leaf area index at both genotypic and phenotypic levels. Whereas, in path co-efficient leaf area index (174.54) and leaf area (2.36) per plant had highest positive direct effect on bulb yield per plot at genotypic and phenotypic levels respectively and these are good contributors to bulb yield. Hence, the study indicated that in the onion crop improvement programmes, the above traits could be utilized in future.