Abstract
Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars, with the aim of improving their productivity by inoculating them with commercially produced Rhizobium phaseoli. With maize (Zea mays L.) as the non‐N2‐fixing control, the percentage of N2 fixed predicted by the 15N‐dilution method was significantly (P ≤ 0.05) higher than that predicted by the N‐difference method. However, the N2 amounts predicted by the two methods were not significantly different. The correlation between the two methods was significant and positive (P ≤ 0.0001, n = 36). Compared with the native rhizobial strain, symbiotic associations of the bean cultivars with UMR1073, UMR1077 and UMR1899 rhizobial inoculants did not significantly (P ≤ 0.05) influence plant dry matter (DM) and N yields, the extent of N2 fixation and uptake of soil and fertilizer N. Nevertheless, the UMR1077 and UMR1899 strains markedly increased the uptake of soil N by R84 plants, while decreasing N2 fixation. In contrast, the Imba‐UMR1899 association enhanced positive effects on all variables. About 60–70% of the total N taken up by the Imba plants was fixed N2. The R79 and R84 plants fixed about 50% of their total N uptake. N2 fixation rates were positively correlated with DM and total N yields, while being negatively correlated with soil N uptake (P ≤ 0.001, n = 36). Future research in Nicaragua should focus on selecting rhizobial strains suitable for indigenous common bean cultivars.
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Claims 13
Claim · model-written summary
The 15N-dilution method estimated a significantly higher percentage of N2 fixed than the N-difference method.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Outcome
- percentage of N2 fixede1
- Direction
- highere1
- Comparator
- N‐difference methode1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e1“the percentage of N2 fixed predicted by the 15N‐dilution method was significantly (P ≤ 0.05) higher than that predicted by the N‐difference method”
Claim · model-written summary
The N2 amounts predicted by the two methods did not differ significantly.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- N2 amountse2
- Comparator
- the two methodse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e2“the N2 amounts predicted by the two methods were not significantly different”
Claim · model-written summary
The correlation between the two N2 estimation methods was significant and positive.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- correlatione3
- Direction
- positivee3
- Comparator
- the two methodse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e3“The correlation between the two methods was significant and positive (P ≤ 0.0001, n = 36)”
Claim · model-written summary
Inoculation with UMR1073, UMR1077 and UMR1899 did not significantly change plant dry matter and N yields compared with the native rhizobial strain.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- UMR1073, UMR1077 and UMR1899 rhizobial inoculantse4
- Interactor
- Rhizobium phaseoliRhizobium phaseolie5symbiont
- Outcome
- plant dry matter (DM) and N yieldse4
- Direction
- no_changeinferrede4
- Comparator
- native rhizobial straine4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e4“Compared with the native rhizobial strain, symbiotic associations of the bean cultivars with UMR1073, UMR1077 and UMR1899 rhizobial inoculants did not significantly (P ≤ 0.05) influence plant dry matter (DM) and N yields, the extent of N2 fixation and uptake of soil and fertilizer N”
e5“inoculating them with commercially produced Rhizobium phaseoli”
Claim · model-written summary
Inoculation with UMR1073, UMR1077 and UMR1899 did not significantly change the extent of N2 fixation or the uptake of soil and fertilizer N compared with the native rhizobial strain.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- UMR1073, UMR1077 and UMR1899 rhizobial inoculantse4
- Interactor
- Rhizobium phaseoliRhizobium phaseolie5symbiont
- Outcome
- the extent of N2 fixation and uptake of soil and fertilizer Ne4
- Direction
- no_changeinferrede4
- Comparator
- native rhizobial straine4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e4“Compared with the native rhizobial strain, symbiotic associations of the bean cultivars with UMR1073, UMR1077 and UMR1899 rhizobial inoculants did not significantly (P ≤ 0.05) influence plant dry matter (DM) and N yields, the extent of N2 fixation and uptake of soil and fertilizer N”
e5“inoculating them with commercially produced Rhizobium phaseoli”
Claim · model-written summary
Strains UMR1077 and UMR1899 markedly increased the uptake of soil N by R84 plants compared with the native rhizobial strain.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Material
- R84e6
- Treatment
- UMR1077 and UMR1899 strainse6
- Outcome
- uptake of soil Ne6
- Direction
- increasede6
- Comparator
- native rhizobial straine4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e6“the UMR1077 and UMR1899 strains markedly increased the uptake of soil N by R84 plants, while decreasing N2 fixation”
e4“Compared with the native rhizobial strain, symbiotic associations of the bean cultivars with UMR1073, UMR1077 and UMR1899 rhizobial inoculants did not significantly (P ≤ 0.05) influence plant dry matter (DM) and N yields, the extent of N2 fixation and uptake of soil and fertilizer N”
Claim · model-written summary
Strains UMR1077 and UMR1899 decreased N2 fixation in R84 plants compared with the native rhizobial strain.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Material
- R84e6
- Treatment
- UMR1077 and UMR1899 strainse6
- Outcome
- N2 fixatione6
- Direction
- decreasinge6
- Comparator
- native rhizobial straine4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e6“the UMR1077 and UMR1899 strains markedly increased the uptake of soil N by R84 plants, while decreasing N2 fixation”
e4“Compared with the native rhizobial strain, symbiotic associations of the bean cultivars with UMR1073, UMR1077 and UMR1899 rhizobial inoculants did not significantly (P ≤ 0.05) influence plant dry matter (DM) and N yields, the extent of N2 fixation and uptake of soil and fertilizer N”
Claim · model-written summary
The Imba and UMR1899 association enhanced positive effects on all measured variables compared with the native rhizobial strain.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Material
- Imbae7
- Treatment
- UMR1899e7
- Outcome
- all variablese7
- Direction
- enhancede7
- Comparator
- native rhizobial straine4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e7“the Imba‐UMR1899 association enhanced positive effects on all variables”
e4“Compared with the native rhizobial strain, symbiotic associations of the bean cultivars with UMR1073, UMR1077 and UMR1899 rhizobial inoculants did not significantly (P ≤ 0.05) influence plant dry matter (DM) and N yields, the extent of N2 fixation and uptake of soil and fertilizer N”
Claim · model-written summary
About 60–70% of the total N taken up by Imba plants was fixed N2.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Material
- Imbae5
- Outcome
- fixed N2e5
- Value
- 60–70%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e5“About 60–70% of the total N taken up by the Imba plants was fixed N2”
Claim · model-written summary
Cultivars R79 and R84 fixed about 50% of their total N uptake.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Material
- R79 and R84e5
- Outcome
- total N uptakee5
- Value
- about 50%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e5“The R79 and R84 plants fixed about 50% of their total N uptake”
Claim · model-written summary
N2 fixation rates were positively correlated with dry matter and total N yields.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- DM and total N yieldse6
- Direction
- positivelye6
- Comparator
- N2 fixation ratese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e6“N2 fixation rates were positively correlated with DM and total N yields, while being negatively correlated with soil N uptake (P ≤ 0.001, n = 36)”
Claim · model-written summary
N2 fixation rates were negatively correlated with soil N uptake.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- soil N uptakee6
- Direction
- negativelye6
- Comparator
- N2 fixation ratese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pot and field experiments were performed to assess N2 fixation in Nicaraguan (R79 and R84) and Ecuadorian (Imba) common bean (Phaseolus vulgaris L.) cultivars”
e6“N2 fixation rates were positively correlated with DM and total N yields, while being negatively correlated with soil N uptake (P ≤ 0.001, n = 36)”
Claim · model-written summary
Future research in Nicaragua should focus on selecting rhizobial strains suitable for indigenous common bean cultivars.
- Taxon
- common beanPhaseolus vulgarise7
- Outcome
- selecting rhizobial strains suitable for indigenous common bean cultivarse7
- Setting
- Nicaraguae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Future research in Nicaragua should focus on selecting rhizobial strains suitable for indigenous common bean cultivars”
The same questions in other papers
inoculation · Rhizobium phaseoli · Phaseolus vulgaris (common bean)Positive and negative results
1 paper in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 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.