Blackgram (Vigna mungo L.) var. T9 was grown in refined sand at six levels of calcium. Visible deficiency symptoms of calcium appeared between 0.025 to 1 mM Ca levels but were mild at 0.5 to 1 mM Ca supply. Reductions in growth, leaf area, flowering, pod formation, biomass production and economic yield were observed upto 1 mM Ca level. In young leaves and seeds supplied with deficient calcium levels, the concentration of non-reducing sugars, starch and soluble protein decreased considerably. Maximum growth and economic yield were obtained at 4 mM Ca supply. Calcium concentration in different plant parts increased with an increase in Ca supply from 0.025 to 6 mM. At 6 mM Ca level interveinal chlorosis was seen in old leaves along with reduction in growth and economic yield of blackgram.
