EFFECTS OF BRADYRHIZOBIUM, NITROGEN AND MICRONUTRIENTS (MOLYBDENUM AND BORON) ON BLACKGRAM (Vigna inungo L.)

Abstract

A pot experiment was conducted at the Net I louse and Laboratory of Soil Science Division. Bangladesh Agricultural Research Institute (BARI). Joydehpur. Gazipur (luring September to December 2007 to study the effect of nitrogen. molybdenum. boron and Brad yrhizobium inoculant on growth. nodulation. yield, yield contributing characters, nitrogen uptake of blackgram. The variety. BARI Mash-3 and I3radyrhizohiwn (BARI RVm-301) were used in the present experiment. There were twelve treatment combinations viz. T 1 : Control (non-inoculated and non-fertilized control). T 2 : PKMo, T 3: PKB. T 4 : Brad vrhizohi urn inoculant. Tj: N, T ( ,: PKMo + Brad_vrhizobiuin Inoculant. 1',: PKB -f Bradyrhizahium lnoculanL Tg: NPKMo, Bradyrhizohiurn Inoculatit and T inoculant TC) : NPKB. T jI): PKMoB. T 3 PKMoB i- 12 : NPICMoB laid out in a Complete Randomized Block Design with 3 (three) replication. Nitrogen ha* muriate of potash (@ 42 kg K ha 1 P. 50 kg N ha 1 , triple super phosphate Cip 22 kg P , boron.@ I kg B ha' and molybdenum ( I kg Mo ha4 were applied as per treatments of the experiment as recommended levels. Gypsum @ 20 kg S ha S ' and zinc sulphate @ 5 kg ha 1 were applied as basal in all pots except in control pot. After 30. 45 and 60 days of sowing. 2 plants were uprooted from each pot to study nodulation, dry matter production and plant growth. At maturity, yield and yield contributing charactcrs were recorded. Bradyrhizohi urn inoculation increased significantly the number of nodules. nodule weight, root and shoot length. seed and stover yield, yield attributes, nitrogen and protein content of blackgram compared to non-inoculated control. Bradyrhizohiurn inoculation in presence of Mo and B recorded the highest nodule number and nodule weight, and also seed and stover yield. Rradyrhizohiwfl inoculation alone or in presence of Mo or boron also recorded higher nodulation over other treatmenL combinations. Brad yrhizohi urn inoculation was better than nitrogen in almost all the parameters studied. Molybdenum and boron performed better results. This result indicated that the use of liradyrhizohiurn inoculants with molybdenum and boron appeared to be an effective method for successful blackgram production.