Thirty interspecific crosses (including reciprocals) involving three genotypes/varieties of greengram (Vigna radiate (L) Wilczek) cv. HUM 1 HUM 2 & HUM 8 and five genotypes/varieties of blackgram (Vigna mungo (L.) Hepper) cv. T 9, Pant U 19, PDU 1, BHUU 1 & BHUU 91-346-1 were attempted. Nine out of 30 crosses were successful only when greengram was used as seed parents. The crossability ranged from to per cent. Germination, survival and pod bearing habit of the F1s hybrids were much better in Kharif season as compared to spring/summer season. The F1 hybrids were intermediate for leaf shape, pod and stem hairiness and pod arrangement while they resembled the maternal parents for cotyledon colour. Purple colour of the stem appeared to be dominant over green colour. The F1s showed positive heterosis for days to flowering and maturity, plant height, number of primary branches, pods per plant and cluster per plant while for pod length, number of seeds per pod, seed yield per plant and l00-seed weight, it exhibited negative heterosis. | Studies on the interspecific hybrids between mungbean and Urdbean
