Rhizobial inoculation improves drought tolerance, biomass and grain yields of common bean (<i>Phaseolus vulgaris</i>  L.) and soybean (<i>Glycine max</i> L.) at Halaba and Boricha in Southern Ethiopia

Aserse, Aregu Amsalu; Markos, Daniel; Getachew, Genet; Yli‐Halla, Markku; Lindström, Kristina

doi:10.1080/03650340.2019.1624724

Cited by 25 publications

(25 citation statements)

References 27 publications

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“…Rhizobia inoculation has been regarded as a sustainable and cost-effective technology to augment the plants' N needs (Ondieki et al, 2017). Several studies have reported that inoculation with rhizobia improves legume growth, nutrition, and production (Takács et al, 2018;Aserse et al, 2020). However, inoculation with proven rhizobia inoculants as well as some commercial inoculants has at times failed to yield positive results when inoculation is done in regions with different agroenvironmental conditions to the original habitat.…”

Section: Introductionmentioning

confidence: 99%

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Nyaga

Njeru

2020

Front. Agron.

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Cowpea [Vigna unguiculata (L.) Walp] is an important crop for smallholder farmers in the marginal areas of sub-Saharan Africa. However, the crop growth and production are affected by low soil fertility due to poor soil management practices. Here, we assessed the effect of native and commercially available rhizobia inoculants on cowpea nodulation, growth, and yields on three local cowpea genotypes (K-80, M-66, and KVU 27-1) in the semiarid areas of Kenya. Field experiments were set in smallholder farms during the 2019 and 2020 cropping seasons. Native rhizobia were isolated from root nodules of cowpea plants used as trap cultures. The isolates were further assessed for symbiotic efficiency (SE) in the greenhouse and field experiments carried out during the short and long rain seasons. Field experiments were laid out in a randomized complete block design with three replications. The treatments consisted of the commercial inoculant (Biofix), native isolates, native + Biofix (consortium), and an uninoculated control. In the greenhouse, the native isolates significantly increased nodule number and dry weight (DW), shoot DW, and root DW when compared to the uninoculated control. Additionally, 50% of the isolates recorded SE of >80%, while 35.7 and 14.3% of the isolates had SE of 51–80 and <50%, respectively. In the field, rhizobia inoculation significantly (P < 0.05) increased nodulation and shoot DW compared to the uninoculated controls. Remarkably, rhizobia inoculation significantly increased yields where inoculation with native isolates recorded 22.7% increase in yield when compared to uninoculated control in the first season and 28.6% increase in yield in the second season. However, the rhizobia inoculants did not show a preference for any of the cowpea genotypes, and their performance was influenced by season and the study location. Our results demonstrate the existence of superior native isolates with potential to be developed to low-cost biofertilizer for sustainable cowpea production.

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Section: Introductionmentioning

confidence: 99%

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Nyaga

Njeru

2020

Front. Agron.

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“…In terms of N supply, leguminous crops can make use of Rhizobia, which are bacteria living symbiotically with legume crops, by fixing atmospheric N 2 [10,11]. Different leguminous crops require specific Rhizobium species for the formation of effective nodules and N 2 fixation [12], and the various strains of Rhizobium species differ in their efficiency of N 2 fixation [13]. The low level of nutrient supply and the lack of effective indigenous Rhizobium populations in soil have limited the faba bean yields [14].…”

Section: Of 14mentioning

confidence: 99%

Rhizobium Inoculation and Chemical Fertilisation Improve Faba Bean Yield and Yield Components in Northwestern Ethiopia

Genetu¹,

Yli‐Halla

Asrat

et al. 2021

Agriculture

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The productivity of the faba bean has declined in Ethiopia, owing to poor management practices, such as blanket fertilisation. In 2018, a field experiment was conducted in a Nitisol soil during the main cropping season in Northwestern Ethiopia, to determine the amount of chemical fertiliser and Rhizobium inoculant to be used for the optimum yield within economic feasibility. The experiment consisted of a factorial combination of five rates of blended NPSZnB fertiliser (0, 60, 121, 180 and 240 kg ha−1) and three rates of inoculant (0, 500 and 750 g ha−1). Sole chemical fertilisation, as well as inoculation, individually produced a seed yield of 2.3–2.5 t ha−1, about 1.0–1.2 t ha−1 more than the control. However, the maximum seed yield (3.3 t ha−1) was recorded from the combined application of both the chemical fertiliser and the inoculant. The seed yield correlated closely with the number of active nodules (R2 = 0.78 **), suggesting a substantial contribution of symbiotic N2 fixation. Inoculation increased the N content of the seed yield by at least 30 kg ha−1. Chemical fertilisation, containing at least 44 kg ha−1 of mineral N does not appear to have an adverse effect on N2 fixation. The combined use of 180 kg ha−1 blended fertiliser with 750 g ha−1 inoculant, producing a maximum net profit of 72,918 birr ha−1 (EUR 2232), is recommended for the study area. This study emphasises that (1) inoculation alone can produce as much seed as the maximum rate of chemical fertilisation, but (2) the maximum yield was produced with a combined use of inoculant and chemical fertiliser, by promoting the vigour of the nodules and N2 fixation.

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“…The collected soils were then mixed properly to form composite samples and air-dried in the greenhouse for further use. Soil parameters such as particle size distribution, pH (H2O), electrical conductivity, total organic carbon, total nitrogen, exchangeable aluminum and basic cations, and potential cation exchange capacity at pH 7.0 were analyzed following the method described in Aserse et al (2019) and the results are presented in Table 1. The soils were fine-textured, eight of them having a texture of clay and two being silty clays.…”

Section: Soil Sample Collection and Description Of Sampling Sitesmentioning

confidence: 99%

Genetically diverse lentil- and faba bean-nodulating rhizobia are present in soils across Central and Southern Ethiopia

Asfaw

Aserse

Asefa

et al. 2020

FEMS Microbiology Ecology

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In total 196 bacterial isolates were obtained from root nodules of lentil (Lens culinaris) and faba bean (Vicia faba) grown on soil samples collected from 10 different sites in central and southern parts of Ethiopia. All isolates were identified as members of the genus Rhizobium by using recA gene sequence analysis. In the recA phylogenetic tree 195 rhizobial strains were classified into nine genospecies. The phylogeny of symbiotic genes nodC and nifH revealed five and six distinct groups respectively, largely dominated by symbiovar viciae. A multivariate analysis showed that environmental variables of the sampling sites considered in this study had more effect on the distribution and composition of the genospecies than the host legumes of the strains. Twenty representative strains, selected based on their isolation site, host plant and nodC group, were able to nodulate all lentil, faba bean, field pea (Pisum abyssinicum) and grass pea (Lathyrus sativus) plants in a greenhouse test in axenic conditions. The majority of the rhizobial strains were effective nitrogen-fixing symbionts for all tested legumes, indicating their potential to serve as broad host-range inoculants in agriculture. The present work suggests the presence of taxonomically and symbiotically diverse rhizobial species for legumes in the Viciae tribe in Ethiopia.

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Rhizobial inoculation improves drought tolerance, biomass and grain yields of common bean (Phaseolus vulgaris L.) and soybean (Glycine max L.) at Halaba and Boricha in Southern Ethiopia

Cited by 25 publications

References 27 publications

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Rhizobium Inoculation and Chemical Fertilisation Improve Faba Bean Yield and Yield Components in Northwestern Ethiopia

Genetically diverse lentil- and faba bean-nodulating rhizobia are present in soils across Central and Southern Ethiopia

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