Abstract
A practical approach was used to develop a Rhizobium (Bradyrhizobium) japonicum inoculant that increases soybean (Glycine max (L.) Merr.) yield in fields with indigenous Rhizobium populations, which typically outcompete strains present in existing commercial inoculants and therefore decrease the value of inoculant use. Field tests managed by several universities in the Mississippi delta region averaged a 169-kg/ha (P < 0.01) grain yield increase. The inoculant contains a mixture of mutants selected for increased nitrogen fixation ability. These mutants were derived from indigenous wild-type strains that are capable of high-level occupancy of nodules in soybean fields in the Mississippi delta region. To ensure microbiological purity, the inoculant is fermented directly in the point-of-use container with a vermiculite carrier (L. Graham-Weiss, M. L. Bennett, and A. S. Paau, Appl. Environ. Microbiol. 53:2138-2140, 1987). It should be possible to use this approach to produce more effective Rhizobium inoculants for any legume in any geographical area.
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Claims 3
Claim · model-written summary
The inoculant increased soybean grain yield by an average 169-kg/ha in Mississippi delta field tests.
- Taxon
- soybean
Glycine maxe1 - Treatment
- Rhizobium (Bradyrhizobium) japonicum inoculante1
- Interactor
- Rhizobium (Bradyrhizobium) japonicum
Bradyrhizobiume1symbiont - Outcome
- grain yielde0
- Direction
- increasee0
- Value
- 169-kg/hae0
- Setting
- Mississippi delta regione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field tests managed by several universities in the Mississippi delta region averaged a 169-kg/ha (P < 0.01) grain yield increase”
e1“Rhizobium (Bradyrhizobium) japonicum inoculant that increases soybean (Glycine max (L.) Merr.) yield”
Claim · model-written summary
Mutant inoculant strains were selected for increased nitrogen fixation ability.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Rhizobium (Bradyrhizobium) japonicumBradyrhizobiume2symbiont
- Outcome
- increased nitrogen fixation abilitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inoculant contains a mixture of mutants selected for increased nitrogen fixation ability”
e1“soybean (Glycine max (L.) Merr.)”
e2“Rhizobium (Bradyrhizobium) japonicum”
Claim · model-written summary
The authors suggest this approach could yield more effective Rhizobium inoculants for legumes elsewhere.
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It should be possible to use this approach to produce more effective Rhizobium inoculants for any legume in any geographical area”
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