Abstract
Plant growth-promoting rhizobacteria (PGPR) colonize plant roots and promote plant growth by producing and secreting various chemical regulators in the rhizosphere. With the recent interest in sustainable agriculture, an increasing number of researchers are investigating ways to improve the efficiency of PGPR use to reduce chemical fertilizer inputs needed for crop production. Accordingly, greenhouse studies were conducted to evaluate the impact of PGPR inoculants on biomass production and nitrogen (N) content of corn (Zea mays L.) under different N levels. Treatments included three PGPR inoculants (two mixtures of PGPR strains and one control without PGPR) and five N application levels (0%, 25%, 50%, 75%, and 100% of the recommended N rate of 135 kg N ha−1). Results showed that inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application under the same N levels at the V6 growth stage, but few differences were observed at the V4 stage. PGPR with 50% of the full N rate produced corn biomass and N concentrations equivalent to or greater than that of the full N rate without inoculants at the VT stage. In conclusion, mixtures of PGPR can potentially reduce inorganic N fertilization without affecting corn plant growth parameters. Future research is needed under field conditions to determine if these PGPR inoculants can be integrated as a bio-fertilizer in crop production nutrient management strategies.
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Claims 5
Claim · model-written summary
PGPR significantly increased corn height, stem diameter and leaf area at V6 versus no PGPR at the same nitrogen levels.
- Taxon
- corn
Zea mays subsp. mayse0 - Organ / stage
- V6 growth stagee0
- Treatment
- inoculation of PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- plant height, stem diameter, leaf areae0
- Direction
- increasede0
- Qualifier
- same N levelse0
- Comparator
- no PGPR applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application under the same N levels at the V6 growth stage”
Claim · model-written summary
PGPR significantly increased corn root morphology at V6.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- V6 growth stagee0
- Treatment
- inoculation of PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- root morphologye0
- Direction
- increasede0
- Qualifier
- same N levelse0
- Comparator
- no PGPR applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application under the same N levels at the V6 growth stage”
Claim · model-written summary
Few growth differences were observed at V4.
- Taxon
- cornZea mays subsp. mayse1
- Organ / stage
- V4 stagee0
- Treatment
- inoculation of PGPRe1
- Interactor
- PGPRe1symbiont
- Outcome
- few differencese0
- Comparator
- no PGPR applicatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but few differences were observed at the V4 stage.”
e1“inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application”
Claim · model-written summary
PGPR with half nitrogen produced biomass and nitrogen concentrations equivalent to or greater than full nitrogen without inoculants at VT.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- VT stagee0
- Treatment
- PGPR with 50% of the full N ratee0
- Interactor
- PGPRe0symbiont
- Outcome
- biomass and N concentrationse0
- Direction
- equivalent to or greater thane0
- Comparator
- full N rate without inoculantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PGPR with 50% of the full N rate produced corn biomass and N concentrations equivalent to or greater than that of the full N rate without inoculants at the VT stage.”
Claim · model-written summary
PGPR mixtures may reduce inorganic nitrogen fertilization without affecting corn growth.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- mixtures of PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- reduce inorganic N fertilization without affecting corn plant growth parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mixtures of PGPR can potentially reduce inorganic N fertilization without affecting corn plant growth parameters.”
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See all 748 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.