Abstract
Abstract BACKGROUND Testing rhizobial inoculation of common bean ( Phaseolus vulgaris L.) in hydroponics enables accurate quantification of biological N 2 fixation ( BNF ) and provides information about the potential of reducing inorganic N fertilizer use. In view of this background, common bean grown on pumice was inoculated with Rhizobium tropici CIAT899 ( Rt ) and supplied with either full‐N (total nitrogen 11.2 mmol L −1 ), 1/3 of full‐N or N‐free nutrient solution ( NS ). BNF was quantified at the early pod‐filling stage using the 15 N natural abundance method. RESULTS Full‐N supply to Rt ‐inoculated plants resulted in markedly smaller nodules than less‐ or zero‐N supply, and no BNF . Rt inoculation of full‐N‐treated plants did not increase biomass and pod yield compared with non‐inoculation. Restriction (1/3 of full‐N) or omission of inorganic N resulted in successful nodulation and BNF (54.3 and 49.2 kg N ha −1 , corresponding to 58 and 100% of total plant N content respectively) but suppressed dry shoot biomass from 191.7 (full‐N, + Rt ) to 107.4 and 43.2 g per plant respectively. Nutrient cation uptake was reduced when inorganic N supply was less or omitted. CONCLUSION Rt inoculation of hydroponic bean provides no advantage when full‐N NS is supplied, while 1/3 of full‐N or N‐free NS suppresses plant biomass and yield, partly because the restricted NO 3 − supply impairs cation uptake. © 2017 Society of Chemical Industry
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Claims 9
Claim · model-written summary
Full N produced smaller nodules in inoculated common bean.
- Taxon
- common bean
Phaseolus vulgarist0 - Treatment
- Full‐N supplye0
- Interactor
- Rte0symbiont
- Outcome
- nodulese0
- Direction
- smallere0
- Comparator
- less‐ or zero‐N supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Full‐N supply to Rt ‐inoculated plants resulted in markedly smaller nodules than less‐ or zero‐N supply”
t0“common bean”
Claim · model-written summary
Full N prevented biological nitrogen fixation in inoculated plants.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- Full‐N supplye0
- Interactor
- Rte0symbiont
- Outcome
- BNFe0
- Direction
- no BNFe0
- Comparator
- less‐ or zero‐N supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Full‐N supply to Rt ‐inoculated plants resulted in markedly smaller nodules than less‐ or zero‐N supply, and no BNF”
t0“common bean”
Claim · model-written summary
Rhizobium inoculation under full N did not raise biomass or pod yield.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- Rt inoculatione0
- Interactor
- Rte0symbiont
- Outcome
- biomass and pod yielde0
- Direction
- did not increasee0
- Comparator
- non‐inoculatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rt inoculation of full‐N‐treated plants did not increase biomass and pod yield compared with non‐inoculation”
t0“common bean”
Claim · model-written summary
1/3 of full‐N enabled BNF of 54.3 kg N ha −1.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- 1/3 of full‐Ne0
- Outcome
- BNFe0
- Direction
- successfule0
- Value
- 54.3e0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restriction (1/3 of full‐N) or omission of inorganic N resulted in successful nodulation and BNF (54.3 and 49.2 kg N ha −1 , corresponding to 58 and 100% of total plant N content respectively)”
t0“common bean”
Claim · model-written summary
omission of inorganic N enabled BNF of 49.2 kg N ha −1.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- omission of inorganic Ne0
- Outcome
- BNFe0
- Direction
- successfule0
- Value
- 49.2e0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restriction (1/3 of full‐N) or omission of inorganic N resulted in successful nodulation and BNF (54.3 and 49.2 kg N ha −1 , corresponding to 58 and 100% of total plant N content respectively)”
t0“common bean”
Claim · model-written summary
1/3 of full‐N suppressed shoot biomass to 107.4.
- Taxon
- common beanPhaseolus vulgarist0
- Interactor
- Rte0symbiont
- Outcome
- dry shoot biomasse0
- Direction
- suppressede0
- Value
- 107.4e0
- Comparator
- full‐Ne0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppressed dry shoot biomass from 191.7 (full‐N, + Rt ) to 107.4 and 43.2 g per plant respectively”
t0“common bean”
Claim · model-written summary
omission of inorganic N suppressed shoot biomass to 43.2 g per plant.
- Taxon
- common beanPhaseolus vulgarist0
- Interactor
- Rte0symbiont
- Outcome
- dry shoot biomasse0
- Direction
- suppressede0
- Value
- 43.2 g per plante0
- Comparator
- full‐Ne0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppressed dry shoot biomass from 191.7 (full‐N, + Rt ) to 107.4 and 43.2 g per plant respectively”
t0“common bean”
Claim · model-written summary
Lower or omitted inorganic N reduced nutrient cation uptake.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- inorganic N supply was less or omittede0
- Outcome
- Nutrient cation uptakee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nutrient cation uptake was reduced when inorganic N supply was less or omitted”
t0“common bean”
Claim · model-written summary
Authors attributed biomass and yield suppression partly to impaired cation uptake under nitrate restriction.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- restricted NO 3 − supplye0
- Outcome
- plant biomass and yielde0
- Qualifier
- impairs cation uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1/3 of full‐N or N‐free NS suppresses plant biomass and yield, partly because the restricted NO 3 − supply impairs cation uptake”
t0“common bean”
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See all 195 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.