Abstract: A field experiment comprised of 14 lines, three testers and 42 F1 hybrids of blackgram was conducted to assess the magnitude of relationship of important plant traits with seed yield during three seasons viz., kharif, rabi and summer. Out of fourteen characters studied, seven viz., branches per plant, pods per plant, seeds per pod, seeds per plant, 100 seed weight pod weight and harvest index were highly significant and positively correlated with seed yield at both phenotypic and genotypic level in all three seasons and pooled over seasons. However four characters viz., seed yield, branches per plant, pods per plant and seeds per plant were highly significantly and positively correlated among themselves revealing their significant influence on seed yield. Selection of these traits are expected to lead positive results in improvement of seed yield in blackgram.