Status of research on soil microsymbionts in Uganda

Nkwiine, Charles; Rwakaikara-Silver, Mary

doi:10.1111/j.0141-6707.2007.00803.x

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Moreover, biological N 2 -fxation was low due to weak P availability. Soybean N-balances can be improved with inoculation, resulting in a 30-70% rise in yield [45,99]. Wortmann and Kaizzi [98] and Rwakaikarasilver and Nkwiine [96] observed that although soybean plants were able to nodulate without the application of inoculation, there was still a yield improvement of about 600 kg•ha −1 when inoculant and fertilizer were combined.…”

Section: Biological Nitrogen Fixationmentioning

confidence: 99%

Role of Phosphorus and Inoculation with Bradyrhizobium in Enhancing Soybean Production

Mirriam

Mugwe

Nasar

et al. 2023

Advances in Agriculture

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Soybean (Glycine max L. Merril) is among the key oil seed crops worldwide, providing several benefits from human consumption to the enhancement of soil productivity. In Uganda, legumes are cultivated on roughly 1.5 million ha, with soybean being produced on a lower production area of 150,000 ha compared to beans (925,000 ha) and groundnuts (253,000 ha). In terms of achievable yield, soybean emerges the highest at 1.2 t·ha−1 as compared to beans (0.5 t·ha−1) and groundnuts (0.7 t·ha−1). Despite the smallest production coverage area, the crop’s feasible grain yield is projected at 4.6 t·ha−1 under optimal environmental conditions. The major bottleneck to the crop’s production is the decreasing soil fertility, mainly caused by low nitrogen (N) but also phosphorus (P) levels in the soil. There is a high potential for supplying N from the atmosphere through biological N fixation (BNF), a natural process mediated by the symbiotic bacteria Bradyrhizobium japonicum, which requires optimum P levels for effective N fixation and increased yield. The current work reviews the present status of soybean production in Uganda, highlights its ecological requirements, importance, and constraints, and proposes the use of inoculation and P application to boost its production.

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Section: Biological Nitrogen Fixationmentioning

confidence: 99%

Role of Phosphorus and Inoculation with Bradyrhizobium in Enhancing Soybean Production

Mirriam

Mugwe

Nasar

et al. 2023

Advances in Agriculture

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Potential of indigenous bradyrhizobia versus commercial inoculants to improve cowpea (Vigna unguiculataL. walp.) and green gram (Vigna radiataL. wilczek.) yields in Kenya

Mathu

Herrmann

Pypers

et al. 2012

Soil Science and Plant Nutrition

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Limited information is available on reduced cowpea (Vigna unguiculata L. Walp.) and green gram (Vigna radiata L.Wilczek.) yields in Kenya. Declining soil fertility and absence or presence of ineffective indigenous rhizobia in soils are assumptions that have been formulated but still require to be demonstrated. In this study, soils were collected from legume growing areas of Western (Bungoma), Nyanza (Bondo), Eastern (Isiolo), Central (Meru) and Coast (Kilifi) provinces in Kenya to assess indigenous rhizobia in soils nodulating cowpea and green gram under greenhouse conditions. Our results showed that highest nodule fresh weights of 4.63 and 3.32 g plant À1 for cowpea and green gram were observed in one soil from Isiolo and another from Kilifi, respectively, suggesting the presence of significant infective indigenous strains in both soils. On the other hand, the lowest nodule fresh weights of 2.17 and 0.72 g plant À1 were observed in one soil from Bungoma for cowpea and green gram, respectively. Symbiotic nitrogen (N) fixation by cowpea and green gram was highest in Kilifi soil with values of 98% and 97%, respectively. A second greenhouse experiment was undertaken to evaluate the performance of commercial rhizobial inoculants with both legumes in Chonyi soil (also from Coast province) containing significant indigenous rhizobia [>13.5 Â 10 3 Colony Forming Units (CFU) g À1]. Rhizobial inoculation did not significantly (P < 0.05) affect nodulation, biomass yield and shoot N content in cowpea and green gram compared with controls. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) of the 16S-23S rDNA intergenic spacer (IGS) region analysis of nodules revealed six groups of which only IGS Group IV corresponded with those from commercial inoculants applied, indicating a lower competitiveness of inoculated strains. In cowpea, IGS III was dominant in nodules of plants inoculated with Biofix and Rizoliq commercial inoculants, and the uninoculated control treatment (63.2, 60 and 52.9%, respectively). Similarly, in green gram, IGS Group III was dominant in nodules of plants inoculated with Biofix 704 and Rizoliq commercial inoculants, and the uninoculated control treatment (75, 73.7 and 61.1%, respectively). Our results suggest that the systematic inoculation of both legumes with current available commercial inoculants to improve biomass yields is not necessary in these regions of Kenya. Also, according to our study, it would make sense to promote the utilization of indigenous strains performing well with both legumes.

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Towards sustainable management of soil biodiversity in agricultural landscapes in Africa

Sileshi¹,

Akinnifesi²,

Ajayi³

et al. 2008

Biodiversity

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Status of research on soil microsymbionts in Uganda

Abstract: A symbiotic relationship involves two or more organisms living together for mutual benefit(s). Neither partner could do well without the other.

Cited by 3 publications

References 25 publications

Role of Phosphorus and Inoculation with Bradyrhizobium in Enhancing Soybean Production

Role of Phosphorus and Inoculation with Bradyrhizobium in Enhancing Soybean Production

Potential of indigenous bradyrhizobia versus commercial inoculants to improve cowpea (Vigna unguiculataL. walp.) and green gram (Vigna radiataL. wilczek.) yields in Kenya

Towards sustainable management of soil biodiversity in agricultural landscapes in Africa

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