Abstract
). While advancements in above-ground agronomic practices have improved NUE, research on soil and below-ground processes are limited. Plant NUE-and its components, N uptake efficiency (NUpE), and N utilization efficiency (NUtE)-can be further improved by exploring crop variety and soil N cycling. Canola parental genotypes (NAM-0 and NAM-17) and hybrids (H151857 and H151816) were grown on a dark brown chernozem in Saskatchewan, Canada. Soil and plant samples were collected at the 5-6 leaf stage and flowering, and seeds were collected at harvest maturity. Soil N cycling varied with phenotypic stage, with higher potential ammonium oxidation rates at the 5-6 leaf stage and higher urease activity at flowering. Seed N uptake was higher under higher urea-N rates, while the converse was true for NUE metrics. Hybrids had higher yield, seed N uptake, NUtE, and NUE, with higher NUE potentially owing to higher NUtE at flowering, which led to higher yield and seed N allocation. Soil N cycling and soil N concentrations correlated for improved canola NUE, revealing below-ground breeding targets. Future studies should consider multiple root characteristics, including rhizosphere microbial N cycling, root exudates, and root system architecture, to determine the below-ground dynamics of plant NUE.
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Claims 10
Claim · model-written summary
Potential soil ammonium oxidation was higher at the 5-6 leaf stage than at flowering.
- Taxon
- Canola
.jpg?width=60)
Brassica napus var. napust0 - Organ / stage
- 5-6 leaf stagee0
- Outcome
- potential ammonium oxidation ratese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Canola”
e0“higher potential ammonium oxidation rates at the 5-6 leaf stage”
Claim · model-written summary
Soil urease activity was higher at flowering.
- Taxon
- CanolaBrassica napus var. napust0
- Organ / stage
- floweringe0
- Outcome
- urease activitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“higher urease activity at flowering”
Claim · model-written summary
Seed nitrogen uptake was higher with higher urea-N rates.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- higher urea-N ratese0
- Outcome
- Seed N uptakee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“Seed N uptake was higher under higher urea-N rates”
Claim · model-written summary
Nitrogen use efficiency metrics were lower under higher urea-N rates.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- higher urea-N ratese0
- Outcome
- NUE metricse0
- Direction
- lowerinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“Seed N uptake was higher under higher urea-N rates, while the converse was true for NUE metrics”
Claim · model-written summary
Hybrids had higher yield than parental genotypes.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Hybridse0
- Outcome
- yielde0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“Hybrids had higher yield, seed N uptake, NUtE, and NUE”
Claim · model-written summary
Hybrids had higher seed nitrogen uptake than parental genotypes.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Hybridse0
- Outcome
- seed N uptakee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“Hybrids had higher yield, seed N uptake, NUtE, and NUE”
Claim · model-written summary
Hybrids had higher nitrogen utilization efficiency than parental genotypes.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Hybridse0
- Outcome
- NUtEe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“Hybrids had higher yield, seed N uptake, NUtE, and NUE”
Claim · model-written summary
Hybrids had higher nitrogen use efficiency than parental genotypes.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Hybridse0
- Outcome
- NUEe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“Hybrids had higher yield, seed N uptake, NUtE, and NUE”
Claim · model-written summary
Higher hybrid nitrogen use efficiency may be due to higher nitrogen utilization efficiency at flowering, leading to higher yield and seed nitrogen allocation.
- Taxon
- CanolaBrassica napus var. napust0
- Outcome
- higher NUEe0
- Qualifier
- higher NUtE at floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“higher NUE potentially owing to higher NUtE at flowering, which led to higher yield and seed N allocation”
Claim · model-written summary
Soil nitrogen cycling and soil nitrogen concentrations correlated with improved canola nitrogen use efficiency.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- improved canola NUEe0
- Qualifier
- Soil N cycling and soil N concentrationse0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil N cycling and soil N concentrations correlated for improved canola NUE”
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