Abstract
In Ethiopia, inoculation of soybean with rhizobial inoculants is not common practice, but could provide an option to increase grain yields in low nitrogen (N) acidic soils. In these acid soils, the selection of acid tolerant rhizobia is one strategy that may increase the performance of soybean. In this study, rhizobial strains isolated from Ethiopian soils were evaluated for their acid tolerance and symbiotic N fixation efficiency with soybean, in controlled environments. Following this, four isolated rhizobial strains were evaluated in six field experiments in major soybean growing areas of Ethiopia. Inoculation with the commercial strain or with one of two locally sourced isolates, that were developed as inoculants, improved soybean yield. The yield increase due to inoculation with the commercial strain was consistent and greater than other treatments, while the increase due to the two locally sourced strains was comparable to, or greater than, application of 46 kg N/ha in soils, where the resident rhizobial population was ≤1.4 × 103 cfu/g soil. For soils with high background rhizobial populations, there was no response to inoculation. In one of the experimental sites (Bako), the percentage of N fixed (%Ndfa) was 55 for the commercial strain and 35 for the local strain, ES3. This study demonstrated that field validation is a necessary step in the selection of acid-tolerant strains of rhizobia to increase soybean production for Ethiopia.
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Claims 7
Claim · model-written summary
Inoculation with the commercial strain or one of two locally sourced rhizobial isolates improved soybean yield.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Inoculation with the commercial strain or with one of two locally sourced isolatese0
- Interactor
- rhizobialt0symbiont
- Outcome
- soybean yielde0
- Direction
- improvede0
- Setting
- Ethiopiat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with the commercial strain or with one of two locally sourced isolates, that were developed as inoculants, improved soybean yield”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
Claim · model-written summary
The soybean yield increase from the commercial strain was consistent and greater than from the other treatments.
- Taxon
- soybeanGlycine maxt0
- Treatment
- inoculation with the commercial straine0
- Interactor
- rhizobialt0symbiont
- Outcome
- yield increasee0
- Direction
- greater thane0
- Comparator
- other treatmentse0
- Setting
- Ethiopiat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield increase due to inoculation with the commercial strain was consistent and greater than other treatments”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
Claim · model-written summary
The yield increase from the two locally sourced strains was comparable to or greater than 46 kg N/ha in soils with resident rhizobial populations of at most 1.4 x 10^3 cfu/g soil.
- Taxon
- soybeanGlycine maxt0
- Treatment
- two locally sourced strainse0
- Interactor
- rhizobialt0symbiont
- Outcome
- increasee0
- Direction
- comparable to, or greater thane0
- Qualifier
- resident rhizobial population was ≤1.4 × 103 cfu/g soile0
- Comparator
- application of 46 kg N/hae0
- Setting
- Ethiopiat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase due to the two locally sourced strains was comparable to, or greater than, application of 46 kg N/ha in soils, where the resident rhizobial population was ≤1.4 × 103 cfu/g soil”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
Claim · model-written summary
In soils with high background rhizobial populations there was no soybean response to inoculation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- inoculatione0
- Interactor
- rhizobialt0symbiont
- Outcome
- response to inoculatione0
- Direction
- no responsee0
- Setting
- Ethiopiat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For soils with high background rhizobial populations, there was no response to inoculation”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
Claim · model-written summary
At Bako, the percentage of N fixed (%Ndfa) was 55 for the commercial strain.
- Taxon
- soybeanGlycine maxt0
- Treatment
- commercial straine0
- Interactor
- rhizobialt0symbiont
- Outcome
- percentage of N fixed (%Ndfa)e0
- Value
- 55e0
- Setting
- Bakoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In one of the experimental sites (Bako), the percentage of N fixed (%Ndfa) was 55 for the commercial strain and 35 for the local strain, ES3”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
Claim · model-written summary
At Bako, the percentage of N fixed (%Ndfa) was 35 for the local strain ES3.
- Taxon
- soybeanGlycine maxt0
- Treatment
- local strain, ES3e0
- Interactor
- rhizobialt0symbiont
- Outcome
- percentage of N fixed (%Ndfa)e0
- Value
- 35e0
- Setting
- Bakoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In one of the experimental sites (Bako), the percentage of N fixed (%Ndfa) was 55 for the commercial strain and 35 for the local strain, ES3”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
Claim · model-written summary
The authors conclude that field validation is a necessary step in selecting acid-tolerant rhizobial strains to increase soybean production in Ethiopia.
- Taxon
- soybeanGlycine maxt0
- Interactor
- rhizobialt0symbiont
- Outcome
- field validation is a necessary step in the selection of acid-tolerant strains of rhizobiae0
- Setting
- Ethiopiat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field validation is a necessary step in the selection of acid-tolerant strains of rhizobia to increase soybean production for Ethiopia”
t0“rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia”
The same questions in other papers
inoculation · yield · Glycine max (soybean)Positive and negative results
490 papers in the same direction as this paper · 63 in the opposite direction · 12 reporting no difference from an alternative
- no effect
- positive
- positive
562 papers more in this group
See all 566 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.