Abstract
Abstract Ecological benefits associated with plant growth‐promoting rhizobacteria (PGPR) inoculants offer a promising integrated nutrient management option to counteract plant nitrogen (N) deficiency. We performed field experiments to evaluate the effect of integrated N fertilizer regime involving chemical N fertilizer (CNF) and N‐enriched compost (NEC), either alone or combined with selected PGPR ( Pseudomonas aeruginosa ) on sunflower seed quality, N use efficiency (NUE) and soil fertility during 2014–2015. We found that integrated N biofertilizer application resulted in significantly higher seed oil concentration, fatty acid composition, and harvest index in both cropping years. Greater effects on N yield efficiency (NYE), N use efficiency (NUE), N physiological efficiency (NPE), and photosynthetic N use efficiency (PNUE) were recorded in nitrogen‐enriched compost+PGPR inoculant (NECPI) treatment followed by chemical N fertilizer+PGPR inoculant (CNFPI) treatment. Statistically significant differences were observed in linoleic and linolenic acid, NYE, and NUE for treatment × year interaction, thus, suggesting that the integrated N biofertilizer approach facilitates the efficient N use by sunflower for improving yield and seed quality. Moreover, we also found considerable enhancement of soil N fertility after two consecutive cropping years of sunflower. The enhancement of seed quality, N use efficiencies, and soil N fertility through integrated N biofertilizer application emphasizes the importance of balanced crop N nutrition, ensuring sufficient N supply to sunflower with adequate N balance in soil for the next crop. Overall, combination of PGPR with NEC amendment may optimize N uptake efficiency and reduce N fertilizer losses, which is necessarily required for the sustainable sunflower production.
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Claims 9
Claim · model-written summary
Integrated nitrogen biofertilizer raised sunflower seed oil concentration significantly in both years.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- integrated N biofertilizer applicatione0
- Outcome
- seed oil concentratione0
- Direction
- highere0
- Qualifier
- both cropping yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“integrated N biofertilizer application resulted in significantly higher seed oil concentration, fatty acid composition, and harvest index in both cropping years”
t0“sunflower”
Claim · model-written summary
Integrated nitrogen biofertilizer raised sunflower seed fatty acid composition significantly in both years.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- integrated N biofertilizer applicatione0
- Outcome
- fatty acid compositione0
- Direction
- highere0
- Qualifier
- both cropping yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“integrated N biofertilizer application resulted in significantly higher seed oil concentration, fatty acid composition, and harvest index in both cropping years”
t0“sunflower”
Claim · model-written summary
Integrated nitrogen biofertilizer raised sunflower harvest index significantly in both years.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- integrated N biofertilizer applicatione0
- Outcome
- harvest indexe0
- Direction
- highere0
- Qualifier
- both cropping yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“integrated N biofertilizer application resulted in significantly higher seed oil concentration, fatty acid composition, and harvest index in both cropping years”
t0“sunflower”
Claim · model-written summary
NECPI produced the greatest effects on NYE, NUE and NPE.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- nitrogen‐enriched compost+PGPR inoculant (NECPI)e0
- Interactor
- PGPRe0symbiont
- Outcome
- N yield efficiency (NYE), N use efficiency (NUE), N physiological efficiency (NPE)e0
- Direction
- Greatere0
- Comparator
- chemical N fertilizer+PGPR inoculant (CNFPI)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater effects on N yield efficiency (NYE), N use efficiency (NUE), N physiological efficiency (NPE), and photosynthetic N use efficiency (PNUE) were recorded in nitrogen‐enriched compost+PGPR inoculant (NECPI) treatment followed by chemical N fertilizer+PGPR inoculant (CNFPI) treatment”
t0“sunflower”
Claim · model-written summary
NECPI produced the greatest effect on photosynthetic N use efficiency.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- nitrogen‐enriched compost+PGPR inoculant (NECPI)e0
- Interactor
- PGPRe0symbiont
- Outcome
- photosynthetic N use efficiency (PNUE)e0
- Direction
- Greatere0
- Comparator
- chemical N fertilizer+PGPR inoculant (CNFPI)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater effects on N yield efficiency (NYE), N use efficiency (NUE), N physiological efficiency (NPE), and photosynthetic N use efficiency (PNUE) were recorded in nitrogen‐enriched compost+PGPR inoculant (NECPI) treatment followed by chemical N fertilizer+PGPR inoculant (CNFPI) treatment”
t0“sunflower”
Claim · model-written summary
Treatment by year interaction significantly affected linoleic and linolenic acids.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- treatment × year interactione0
- Outcome
- linoleic and linolenic acide0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences were observed in linoleic and linolenic acid, NYE, and NUE for treatment × year interaction”
t0“sunflower”
Claim · model-written summary
Treatment by year interaction significantly affected NYE and NUE.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- treatment × year interactione0
- Outcome
- NYE, and NUEe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences were observed in linoleic and linolenic acid, NYE, and NUE for treatment × year interaction”
t0“sunflower”
Claim · model-written summary
Soil nitrogen fertility improved after two consecutive sunflower cropping years.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- soil N fertilitye0
- Direction
- enhancemente0
- Qualifier
- two consecutive cropping yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“considerable enhancement of soil N fertility after two consecutive cropping years of sunflower”
Claim · model-written summary
The authors suggest PGPR with NEC may optimize nitrogen uptake efficiency and reduce fertilizer losses.
- Taxon
- sunflowerHelianthus annuust0
- Interactor
- PGPRe0symbiont
- Outcome
- optimize N uptake efficiency and reduce N fertilizer lossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combination of PGPR with NEC amendment may optimize N uptake efficiency and reduce N fertilizer losses”
t0“sunflower”
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