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Vol.6 , No. 1, Publication Date: Jan. 29, 2021, Page: 1-10
, elite strains NAK 128, NAK 84, RACA 6, IRJ 2180 A, RANI 22, USDA 532 C (Ref), USDA 110 (Ref) and 60 kg N ha<sup>-1</sup>. While those for groundnut were; MJR 493, SBG 234, SSN 336, SNN 343, IGB 469, NC 92 (Ref) and 60 kg N ha<sup>-1</sup>. All plots received a basal dose of 30 kg P ha<sup>-1</sup> at planting, while the nitrogen fertilizer treatment was spot-applied as Urea in 2 splits (20 kg N ha<sup>-1</sup> at 2 weeks after planting (WAP), and 40 kg N ha<sup>-1</sup> at 4 WAP). Each treatment plot was 36 m<sup>2</sup> of six manually made ridges each of 6 m long with an inter-ridge spacing of 80 cm. The trial was laid out in a Randomized Complete Block Design (RCBD) and replicated three times on each farmer’s field. Data were collected on plant height at 4, 6 and 8 WAP, Nodule number, nodule dry weight, shoot dry weight at mid-flowering, pod yield, grain yield and 100 grain weight at harvest. Maize was planted as reference crop to estimate the amount of N fixed by the legumes using the N-difference method. The MPN results showed a high population of native rhizobia in the soils. Groundnut plants inoculated with IGB 469 produced significantly higher pod and grain yield by about 30% respectively over the uninnoculated plants in Gidan Kwano. In the soybean experiment, it was observed that plants inoculated with RANI 22 produced significantly 60% and 56% higher nodule biomass than the uninnoculated plants in Gidan Kwano and Gurusu farm sites respectively. The results of this study indicated that response to inoculation by the legumes varied from one farm field to another and some of the elite strains stimulated increase in nodulation, shoot biomass, pod yield, grain yield and amount of N fixed which were significantly higher than the control.&picture=http://www.aascit.org/aascit/decorators/img/journal/971.jpg)
| [1] | Ederigbe Raymond, Soil Science and Land Management Department, Federal University of Technology, Minna, Nigeria. |
| [2] | Osunde Akim Osarhiemen, Soil Science and Land Management Department, Federal University of Technology, Minna, Nigeria. |
| [3] | Bala Abdullahi, Soil Science and Land Management Department, Federal University of Technology, Minna, Nigeria. |
The increased use of symbiotic fixation of nitrogen by rhizobia should help in achieving increased yield of grain legume crops in a most economical way. A trial was conducted during the 2018 cropping season on four farmers’ fields located in villages around Minna, using the SAMNUT 24 groundnut and TGX1835-10E soybean cultivars. The objective of the study was to observe the response of these legumes to some elite rhizobia strains that were evaluated in comparison with known reference inoculants and the indigenous soil rhizobia of the locality. The Treatments for soybean include: uninnoculated (control), elite strains NAK 128, NAK 84, RACA 6, IRJ 2180 A, RANI 22, USDA 532 C (Ref), USDA 110 (Ref) and 60 kg N ha-1. While those for groundnut were; MJR 493, SBG 234, SSN 336, SNN 343, IGB 469, NC 92 (Ref) and 60 kg N ha-1. All plots received a basal dose of 30 kg P ha-1 at planting, while the nitrogen fertilizer treatment was spot-applied as Urea in 2 splits (20 kg N ha-1 at 2 weeks after planting (WAP), and 40 kg N ha-1 at 4 WAP). Each treatment plot was 36 m2 of six manually made ridges each of 6 m long with an inter-ridge spacing of 80 cm. The trial was laid out in a Randomized Complete Block Design (RCBD) and replicated three times on each farmer’s field. Data were collected on plant height at 4, 6 and 8 WAP, Nodule number, nodule dry weight, shoot dry weight at mid-flowering, pod yield, grain yield and 100 grain weight at harvest. Maize was planted as reference crop to estimate the amount of N fixed by the legumes using the N-difference method. The MPN results showed a high population of native rhizobia in the soils. Groundnut plants inoculated with IGB 469 produced significantly higher pod and grain yield by about 30% respectively over the uninnoculated plants in Gidan Kwano. In the soybean experiment, it was observed that plants inoculated with RANI 22 produced significantly 60% and 56% higher nodule biomass than the uninnoculated plants in Gidan Kwano and Gurusu farm sites respectively. The results of this study indicated that response to inoculation by the legumes varied from one farm field to another and some of the elite strains stimulated increase in nodulation, shoot biomass, pod yield, grain yield and amount of N fixed which were significantly higher than the control.
Keywords
Rhizobial, Inoculation, Elite Strain, Nodulation, Farmers’ Fields, N Uptake, N Fixation
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