Abstract
The effect of inoculant formulation on the population dynamics of rhizobia in the pea rhizosphere was investigated using a streptomycin-resistant mutant of Rhizobium leguminosarum bv. viceae NITRAGIN128C56G (128C56G strR). The isolate was formulated into liquid, peat powder, and granular peat carriers, and was tested on pea at field sites near Saskatoon, Saskatchewan, and Beaverlodge, Alberta, in 1996 and 1997. The liquid and peat powder formulations were applied to seed while the granular inoculant was applied to soil. In three out of four site years, population dynamics were similar among formulations: an initial decline or lag period lasting 2-5 days followed by an increase to approximately 10(5) colony-forming units (CFU)/seedling by 14-28 days after planting (DAP) and, where sampled, a continuing increase from 10(7) to 10(8) CFU/plant at 63 DAP. In these same site years, nodule number (not determined at Beaverlodge in 1997) and nodule occupancy at 60 days were not significantly different among formulations. In contrast, soil populations of 128C56G strR from the liquid formulation declined to near zero by 28 DAP at Beaverlodge in 1996, when soil moisture was excessive in spring because of high rainfall. Populations increased in this treatment after this time, but remained significantly lower than the populations of the other two formulations throughout the sampling period. Pea seed yields were not significantly different among treatments in either year at Beaverlodge, but were significantly higher with granular inoculant than the noninoculated control in Saskatoon. Within inoculated treatments at Saskatoon, there were no significant differences in grain yield.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Across three of four site years, rhizobial populations showed a two-to-five-day lag followed by growth to about 10^5 CFU per seedling by 14–28 days.
- Taxon
- pea
Lathyrus oleraceust0 - Outcome
- population dynamicse0
- Direction
- increasee0
- Value
- approximately 10(5) colony-forming units (CFU)/seedlinge0
- Qualifier
- In three out of four site yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In three out of four site years, population dynamics were similar among formulations: an initial decline or lag period lasting 2-5 days followed by an increase to approximately 10(5) colony-forming units (CFU)/seedling by 14-28 days after planting (DAP)”
t0“pea rhizosphere”
Claim · model-written summary
Where sampled, rhizobial populations continued to rise to 10^7–10^8 CFU per plant at 63 days.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- CFU/plante0
- Direction
- increasee0
- Value
- 10(7) to 10(8) CFU/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a continuing increase from 10(7) to 10(8) CFU/plant at 63 DAP”
t0“pea rhizosphere”
Claim · model-written summary
Nodule number was not significantly different among inoculant formulations.
- Treatment
- formulationse0
- Outcome
- nodule numbere0
- Direction
- not significantly differente0
- Comparator
- among formulationse0
- Setting
- Beaverlodgee0
Not reportedTaxon
Verbatim
e0“nodule number (not determined at Beaverlodge in 1997) and nodule occupancy at 60 days were not significantly different among formulations.”
Claim · model-written summary
Nodule occupancy at 60 days did not significantly differ among formulations.
- Treatment
- formulationse0
- Outcome
- nodule occupancye0
- Direction
- not significantly differente0
- Comparator
- among formulationse0
Not reportedTaxon
Verbatim
e0“nodule occupancy at 60 days were not significantly different among formulations.”
Claim · model-written summary
At wet Beaverlodge in 1996, soil populations from the liquid formulation fell nearly to zero by 28 days.
- Treatment
- liquid formulatione0
- Outcome
- soil populations of 128C56G strRe0
- Direction
- declinede0
- Qualifier
- soil moisture was excessive in springe0
- Setting
- Beaverlodgee0
Not reportedTaxonComparator
Verbatim
e0“soil populations of 128C56G strR from the liquid formulation declined to near zero by 28 DAP at Beaverlodge in 1996, when soil moisture was excessive in spring because of high rainfall.”
Claim · model-written summary
Liquid-formulation rhizobial populations later rose but remained significantly below those of peat formulations.
- Treatment
- this treatmente0
- Outcome
- Populationse0
- Direction
- significantly lowere0
- Comparator
- the other two formulationse0
Not reportedTaxon
Verbatim
e0“Populations increased in this treatment after this time, but remained significantly lower than the populations of the other two formulations throughout the sampling period.”
Claim · model-written summary
Pea seed yields did not significantly differ among treatments at Beaverlodge in either year.
- Taxon
- PeaLathyrus oleraceuse0
- Treatment
- treatmentse0
- Outcome
- seed yieldse0
- Direction
- not significantly differente0
- Comparator
- among treatmentse0
- Setting
- Beaverlodgee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seed yields were not significantly different among treatments in either year at Beaverlodge”
Claim · model-written summary
At Saskatoon, granular inoculant raised pea seed yield significantly above the uninoculated control.
- Taxon
- PeaLathyrus oleraceuse1
- Treatment
- granular inoculante0
- Outcome
- seed yieldse1
- Direction
- significantly highere0
- Comparator
- noninoculated controle0
- Setting
- Saskatoone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly higher with granular inoculant than the noninoculated control in Saskatoon.”
e1“Pea seed yields were not significantly different”
Claim · model-written summary
At Saskatoon, grain yield did not significantly differ among inoculated treatments.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- inoculated treatmentse0
- Outcome
- grain yielde0
- Direction
- no significant differencese0
- Comparator
- Within inoculated treatmentse0
- Setting
- Saskatoone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within inoculated treatments at Saskatoon, there were no significant differences in grain yield.”
t0“pea rhizosphere”
The same questions in other papers
inoculation · yield · Lathyrus oleraceus (pea)Results differ
107 papers in the same direction as this paper · 16 in the opposite direction · 3 reporting no difference from an alternative
- positive
- positive
- negative
123 papers more in this group
See all 127 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.