Abstract
A study was conducted to evaluate the effect of soil pH on rhizobium inoculation, plant growth and nodulation of cowpea (Vigna unguiculata). Both inoculated and non‐inoculated seeds of the cultivar ‘California Blackeye No. 5’ were grown in the greenhouse in plastic pots with growth medium being a Norfolk sandy loam (Fine, loamy siliceous, thermic, Typic Palendult) soil under different pH levels. Both soil pH and rhizobium inoculation significantly affected root length, plant height, nodule and pod number per plant. Within the pH range of 6.6 to 7.6, these growth parameters generally were at their maximum, decreasing above or below this pH range. Non‐inoculated plants produced some nodules, indicating failure of the methyl bromide to totally destroy all residual soil rhizobta before inoculation treatment. The inoculated plants produced more seeds and the increased number of nodules of treated plants was directly related to increased seed weight. Since nodule number was highest at the approximate pH range of 6.6 to 7.6, this range was considered optimum for nodulation of cowpea by this strain of rhizobium under greenhouse conditions. At pH 7.5 and above, roots tended to be more fibrous and nodules were generally smaller in size.
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Claims 12
Claim · model-written summary
soil pH significantly affected root length, plant height of cowpea, with no direction stated.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- soil pHe0
- Outcome
- root length, plant heighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Both soil pH and rhizobium inoculation significantly affected root length, plant height, nodule and pod number per plant”
Claim · model-written summary
soil pH significantly affected nodule and pod number per plant of cowpea, with no direction stated.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- soil pHe0
- Outcome
- nodule and pod number per plante0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Both soil pH and rhizobium inoculation significantly affected root length, plant height, nodule and pod number per plant”
Claim · model-written summary
rhizobium inoculation significantly affected root length, plant height of cowpea, with no direction stated.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- rhizobium inoculatione0
- Outcome
- root length, plant heighte0
RhizobiumNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Both soil pH and rhizobium inoculation significantly affected root length, plant height, nodule and pod number per plant”
Claim · model-written summary
rhizobium inoculation significantly affected nodule and pod number per plant of cowpea, with no direction stated.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- rhizobium inoculatione0
- Outcome
- nodule and pod number per plante0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Both soil pH and rhizobium inoculation significantly affected root length, plant height, nodule and pod number per plant”
Claim · model-written summary
Within soil pH 6.6 to 7.6, cowpea root length, plant height, nodule and pod number were generally at their maximum and decreased above or below this range.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- pH range of 6.6 to 7.6e0
- Outcome
- growth parameterse0
- Direction
- maximume0
- Comparator
- above or below this pH rangee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Within the pH range of 6.6 to 7.6, these growth parameters generally were at their maximum, decreasing above or below this pH range”
Claim · model-written summary
Non-inoculated cowpea plants produced some nodules, indicating that methyl bromide did not totally destroy residual soil rhizobia before inoculation.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- produced some nodulese0
- Qualifier
- Non‐inoculatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“Non‐inoculated plants produced some nodules, indicating failure of the methyl bromide to totally destroy all residual soil rhizobta before inoculation treatment”
Claim · model-written summary
Inoculated cowpea plants produced more seeds.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- inoculatede0
- Outcome
- seedse0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“The inoculated plants produced more seeds”
Claim · model-written summary
The increased number of nodules on treated cowpea plants was directly related to increased seed weight.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- nodulese0
- Outcome
- seed weighte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“the increased number of nodules of treated plants was directly related to increased seed weight”
Claim · model-written summary
Cowpea nodule number was highest at about pH 6.6 to 7.6.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- pH range of 6.6 to 7.6e0
- Outcome
- nodule numbere0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“nodule number was highest at the approximate pH range of 6.6 to 7.6”
Claim · model-written summary
The pH range 6.6 to 7.6 was considered optimum for nodulation of cowpea by this rhizobium strain under greenhouse conditions.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- optimum for nodulatione0
- Setting
- greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this range was considered optimum for nodulation of cowpea by this strain of rhizobium under greenhouse conditions”
Claim · model-written summary
At pH 7.5 and above, cowpea roots tended to be more fibrous.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- pH 7.5 and abovee0
- Outcome
- rootse0
- Direction
- more fibrouse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“At pH 7.5 and above, roots tended to be more fibrous and nodules were generally smaller in size”
Claim · model-written summary
At pH 7.5 and above, cowpea nodules were generally smaller in size.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- nodulese0
- Treatment
- pH 7.5 and abovee0
- Outcome
- sizee0
- Direction
- smallere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea”
e0“At pH 7.5 and above, roots tended to be more fibrous and nodules were generally smaller in size”
The same questions in other papers
inoculation · yield · Vigna unguiculata (cowpea)Results differ
98 papers in the same direction as this paper · 16 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
112 papers more in this group
See all 116 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.