Effect of soil moisture, salinity and rhizobium inoculation on nodulation, nitrogen fixation and growth of some acacia species in the Sudan
2011
El-Tahir, I.A., Agricultural Research Corporation, Wad Medani (Sudan) | Babiker, H.M., University of Gezira, Wad Medani (Sudan). Faculty of Agricutural Sciences | Mukhtar, N.O., Agricultural Research Corporation, Wad Medani (Sudan) | Hamad, M.E., University of Gezira, Wad Medani (Sudan). Faculty of Agricutural Sciences
Two pot experiments were raised in the nursery of the Forestry Research Section, Gezira Research Station, Wad Medani, Sudan, with objective to study the effects of soil moisture, salinity and Rhizobium inoculation on growth performance, nodulation and N2-fixation of Acacia polycantha, A. seyal and A. mellifera. The soil moisture levels used in the study were, field capacity (M1), ¨ø field capacity (M2) and ¨÷ field capacity (M3) and the salinity levels were, 0.5 (S1), 2 (S2), 4 (S3), 6 (S4) and 8 dS/m (S5)]. The experiments were carried during August 2005 and repeated in November 2006, terminated after 28 weeks and laid out in split-split plot design. The species were in the main plot, inoculums in the sub-plot and the moisture levels in the sub-sub-plot and replicated five replications. The growth parameters evaluated were, dry biomass, nodule number, nodule dry weight and nitrogen content. The study showed that A. polycantha and M2 moisture level resulted in the highest means for the different growth parameters. Inoculated seedlings were more favored by M2, but suppressed by both M1 and M3. At all the moisture levels, Acacia polycantha showed the highest nodule number while A. mellifera gave the highest mean dry biomass at M2, but the inoculated A. seyal was not affected at all the moisture levels. Both nodulation and growth were more affected by salinity rather than by inoculation. Across salinity levels, A. mellifera was more tolerant, A. polycantha showed low tolerance while A. seyal was less tolerant to salinity
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