Abstract
The potential of plant growth-promoting rhizobacteria (PGPR) to improve plant growth and nutrient acquisition has received increased attention. This study investigated the synergistic effects of combining PGPR Paraburkholderia sp. SOS3 with the addition of inorganic N fertilizer (iN) or a combined application of inorganic N with organic manure-based fertilizer (iNoN) at low and high levels of N fertilization on Macadamia integrifolia seedling growth. We studied plant growth, mineral N in soil-leachate, and media physicochemical and microbial characteristics. Growth of seedlings fertilized with iNoN at high N level (iNoN 100) was enhanced by PGPR inoculation, with an increase of 32% in total biomass and 43% in N uptake, compared with uninoculated seedlings. No significant PGPR effect was observed on growth under low or high inorganic N treatments but PGPR significantly reduced N leaching after 3 weeks of fertilization. We found a positive relationship between media and plant δ15N and plant N uptake, and a strong increase in microbial-biomass N under the most productive fertilization treatment (iNoN 100 with PGPR), compared with the other N treatments (without or with PGPR). The results suggest that PGPR improves N acquisition by reducing mineral N loss and increasing plant N availability, but that these effects depend on the N form and N level.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 7
Claim · model-written summary
PGPR increased seedling biomass by 32% under iNoN 100 fertilization.
- Taxon
- Macadamia integrifolia
Macadamia integrifoliat0 - Treatment
- PGPR inoculatione0
- Interactor
- PGPRe0symbiont
- Outcome
- total biomasse0
- Direction
- increasee0
- Value
- 32%e0
- Qualifier
- iNoN 100e0
- Comparator
- uninoculated seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“Growth of seedlings fertilized with iNoN at high N level (iNoN 100) was enhanced by PGPR inoculation, with an increase of 32% in total biomass and 43% in N uptake, compared with uninoculated seedlings”
Claim · model-written summary
PGPR increased nitrogen uptake by 43% under iNoN 100 fertilization.
- Taxon
- Macadamia integrifoliaMacadamia integrifoliat0
- Treatment
- PGPR inoculatione0
- Interactor
- PGPRe0symbiont
- Outcome
- N uptakee0
- Direction
- increasee0
- Value
- 43%e0
- Qualifier
- iNoN 100e0
- Comparator
- uninoculated seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“Growth of seedlings fertilized with iNoN at high N level (iNoN 100) was enhanced by PGPR inoculation, with an increase of 32% in total biomass and 43% in N uptake, compared with uninoculated seedlings”
Claim · model-written summary
PGPR did not significantly affect growth under inorganic nitrogen treatments.
- Taxon
- Macadamia integrifoliaMacadamia integrifoliat0
- Treatment
- PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- growthe0
- Qualifier
- low or high inorganic N treatmentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“No significant PGPR effect was observed on growth under low or high inorganic N treatments”
Claim · model-written summary
PGPR reduced nitrogen leaching after three weeks.
- Taxon
- Macadamia integrifoliaMacadamia integrifoliat0
- Treatment
- PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- N leachinge0
- Direction
- reducede0
- Qualifier
- after 3 weeks of fertilizatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“PGPR significantly reduced N leaching after 3 weeks of fertilization”
Claim · model-written summary
Media and plant nitrogen isotope values were positively related to nitrogen uptake.
- Taxon
- Macadamia integrifoliaMacadamia integrifoliat0
- Compound
- δ15Ne0
- Outcome
- plant N uptakee0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“We found a positive relationship between media and plant δ15N and plant N uptake”
Claim · model-written summary
Microbial biomass nitrogen was higher under iNoN 100 with PGPR than other nitrogen treatments.
- Taxon
- Macadamia integrifoliaMacadamia integrifoliat0
- Treatment
- iNoN 100 with PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- microbial-biomass Ne0
- Direction
- increasee0
- Comparator
- other N treatments (without or with PGPR)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“a strong increase in microbial-biomass N under the most productive fertilization treatment (iNoN 100 with PGPR), compared with the other N treatments (without or with PGPR)”
Claim · model-written summary
The authors interpret PGPR as increasing plant nitrogen availability and reducing mineral nitrogen loss, depending on nitrogen form and level.
- Taxon
- Macadamia integrifoliaMacadamia integrifoliat0
- Treatment
- PGPRe0
- Interactor
- PGPRe0symbiont
- Outcome
- N acquisitione0
- Qualifier
- depend on the N form and N levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Macadamia integrifolia”
e0“PGPR improves N acquisition by reducing mineral N loss and increasing plant N availability, but that these effects depend on the N form and N level”
The same questions in other papers
inoculation · growth · Macadamia integrifolia (macadamia nut)Results agree
1 paper in the same direction as this paper
- positive
inoculation · nutrient: content · Macadamia integrifolia (macadamia nut)Results agree
1 paper in the same direction as this paper
- positive
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.