EFFECTS OF BRADYRHIZOBJUM, NITROGEN AND MICRONUTRIENTS (MOLYBDENUM AND BORON) ON BLACKGRAM (Vigna mungo L.)

Abstract

A pol experiment was conducted at the Net I rouse and J .uboratory of Soil Science Div ision, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during September Lo I >ecember 2007 to study the effect of nitrogen, molybdenum. boron and Bradyrhizobium inoculant on growth, nodulation, ) icld. yield contributing characters. nitrogen uptake of black gram. I he variety. BARI Mash-J and Bradv rhizobium inoculant {liARJ RVm-301) were used in the present experiment. I here were twelve treatment combinations viz. T1: ontrol (non-inoculated and non-fertilized control). T2: PKMo. I' 1: PKB. T4: Bradyrhizabium inoculanr, T« N. r0: Pf....Mo + Bradyrhizobium Inoculant, 11: PKB + Bradyrhizobium Inocularu, r~: NPKMo. f9: NPKB. l 10: PKMoR. r11: PKMoB + Brad) rhizobium lnoculant and 1'12: NPKMoB laid out in a Complete Randomized Block Design with 3 (three) replication. Nitrogen@ 50 kg N ha-1~ triple super phosphate@ 22 kg P ha-•. muriate of potash (@ 42 kg K ha", boron @ I kg B ha"1 and rnoly bdcnum @ I kg rvto ha" were applied as per treatments of the experiment as recommended levels. Gypsum@ 20 kg Sha-• and zinc sulphate@ 5 kg ha" were applied as basal in all pots except in control pot. After 30~ 45 and 60 day s of sowing, 2 plan ls were uprooted from each pot to study nodulation, dry matter production and plant growth. Al maturity, ) ield and ) ield contributing characters "ere recorded. Bradyrhizobium inoculation increased significantly the number of nodules. nodule weight. root and shoot length. seed and stover) icld, yield attributes. nitrogen and protein content of blackgram compared to non-inoculated control. Brady rhizobium inoculation in presence of Mo and B recorded the highest nodule number and nodule weight. and also seed and stover ) icld. Bradyrhizobium inoculation alone or in presence of Mo or boron also recorded higher nodulation over other treatment combinations. Brady rhizobium inoculation was better than nitrogen in almost all the par- • ameters studied. Moly bdcnum and boron performed better results. ·y his result indicated that the use of Brudy rhizobium inoculants with molybdenum and boron appeared lo be an effective method for successful blackgram production.