Field experiments were conducted with blackgram var. COBG 593 (in 2000) and TMV 1 (in 2001) at Alandurai and Mathuvarayapuram in a red sandy loam soil for assessing the efficacy of soil application and seed treatment by Zn, B, Sand Mo during 2000 and 2001. The results indicated that, soil application of 5 kg Zn + 1.5kg B + 0.5 kg Mo + 40 kg S ha −1 increased the yield of both the varieties and the yield increase was more with COBG 593 (34.1%) than TMV 1 (21%) indicating the high responsiveness of COBG 593 to added fertilisers. Soil application is found to be the best when compared to seed treatment of Zn, B, S and Mo. Similar trends of results were observed with nutrient availability and uptake.