Blackgram is the most important rice-fallow crop in Kanyakumari District, Tamil Nadu, India. Huge labor cost for multiple harvests forced the farmers to leave the land un-cultivable many of times. Hence, the farmers need a synchronized maturing variety in blackgram. Synchronized maturing varieties viz., VBN (BG) 6, and Blackgram MDU 1 were test verified with the local cultivar in the rice-fallow condition during 2016 as on-farm testing. About one acre of land divided into three and VBN (BG) 6 and Blackgram MDU 1 varieties was test verified with local cultivar. Results indicated that taller plants (54.5 cm) and increased number of seeds/pod (6.7) noted with blackgram MDU 1 variety over VBN (BG) 6. The number of pods/plant were significantly higher (28.1) with VBN (BG) 6 compared to Blackgram MDU 1 and local cultivar. Similarly, 27.9 per cent of increased grain yields recorded in VBN (BG) 6 than Blackgram MDU 1. Due to higher yield, the economic parameters such as gross return, net return and B:C ratio were also higher in VBN (BG) 6 as compared with Blackgram MDU 1 and local cultivar. Yellow mosaic virus incidence was also absent in VBN (BG) 6 variety. Hence, it is concluded that VBN (BG) 6 is the best-suited blackgram variety in rice-fallow conditions of the Kanyakumari district.
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