Symbiosis and yield of common bean (Phaseous vulgaris L.) as affected by Rhizobium inoculation and nitrogen fertilization
2012
Adlan, M.A., Gezira Research Station, Agricultural Research Corporation, Wad Medani (Sudan) | Babiker, H.M., Faculty of Agricultural Sciences, University of Gezira, Wad Medani (Sudan) | Mukhtar, N.O., Gezira Research Station, Agricultural Research Corporation, Wad Medani (Sudan) | Abdelmalik, E.M., Faculty of Agricultural Sciences, University of Gezira, Wad Medani (Sudan) | Ali, H.K.Hudieba Research Station, Agricultural Research Corporation, EL-Dammer, (Sudan)
Two experiments were carried; the first at Wad Medani during 2001- 2003 and the second at Wad Medani, Faddasi (at the Blue Nile bank) and Hudieba Karu and High Terrace soils in 2003/04. The objectives were to examine the effect of Rhizobium inoculation and nitrogen fertilization on nodulation, N2-fixation and yield of common bean. The first experiment included a control treatment, 120 kg N haE-1 and inoculation with four Rhizobium isolates and one strain. The second one involved a control, 120 kg N haE-1 and inoculation with two Rhizobium strains. In the latter experiment, 15N methodology was used to assess biological N2-fixation. The treatments in each experiment were arranged in an RCBD replicated four times. The results showed that the application of N significantly enhanced the yield of common bean in the two seasons of the first experiment and at all locations except at Faddasi in the second experiment. This indicates the need for inoculation with efficient rhizobia at Wad Medani, Hudieba Karu and High Terrace soils. The relatively high total soil N (914 ppm) prevented the response to N application at Fadassi. All Rhizobium strains and isolates used in the study showed no significant effect in improving the tested parameters. The indigenous strain En2 increased nodulation and N2-fixation at all and across the locations, but the increase was not significant. The exotic strain USDA 2674 decreased nodulation and N2- fixation at all locations and significantly decreased N2-fixation across them. The %Ndfa for all locations ranged from 39 to 66%
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