Abstract
Abstract The radiation‐use efficiency (RUE) is a parameter that represents a crop canopy's ability to convert intercepted solar energy to dry matter. The RUE is used in simulation models and can vary with crop type and environment. The objective was to examine the effects of varying row width and seeding rate on the amount of intercepted photosynthetically active radiation (IPAR) and the RUE in summer rape ( Brassica napus L.). ‘Westar’ summer rape was seeded at rates of 1.5, 3.0, 6.0, and 12.0 kg ha −1 in rows spaced 15 or 30 cm apart. Plant sampling was done at key growth stages, and the leaf and pod areas and total plant dry weights were determined. After flowering, plants intercepted more PAR when grown in 15‐cm‐wide rows than 30‐cm‐wide rows. For both row widths, as seeding rate increased from 1.5 to 12.0 kg ha −1 , IPAR increased. The RUE was greater for plants grown in 15‐cm‐wide rows than for those grown in 30‐cm rows; however, RUE decreased with increasing seeding rate. The mean RUE value was 2.83 g MJ −1 PAR. When the pod area was added to the leaf area, the IPAR increased and the RUE decreased.
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Claims 7
Claim · model-written summary
After flowering, 15-cm rows intercepted more PAR than 30-cm rows.
- Taxon
- Summer Rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Organ / stage
- floweringe0
- Treatment
- 15‐cm‐wide rowse0
- Outcome
- PARe0
- Direction
- moree0
- Comparator
- 30‐cm‐wide rowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“After flowering, plants intercepted more PAR when grown in 15‐cm‐wide rows than 30‐cm‐wide rows”
t0“Summer Rape”
Claim · model-written summary
IPAR increased as seeding rate rose from 1.5 to 12.0 kg ha−1 at both row widths.
- Taxon
- Summer RapeBrassica napust0
- Treatment
- seeding rate increased from 1.5 to 12.0 kg ha −1e0
- Outcome
- IPARe0
- Direction
- increasede0
- Qualifier
- both row widthse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both row widths, as seeding rate increased from 1.5 to 12.0 kg ha −1 , IPAR increased”
t0“Summer Rape”
Claim · model-written summary
RUE was greater in 15-cm rows than 30-cm rows.
- Taxon
- Summer RapeBrassica napust0
- Treatment
- 15‐cm‐wide rowse0
- Outcome
- RUEe0
- Direction
- greatere0
- Comparator
- 30‐cm rowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RUE was greater for plants grown in 15‐cm‐wide rows than for those grown in 30‐cm rows”
t0“Summer Rape”
Claim · model-written summary
RUE decreased with increasing seeding rate.
- Taxon
- Summer RapeBrassica napust0
- Treatment
- increasing seeding ratee0
- Outcome
- RUEe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RUE decreased with increasing seeding rate”
t0“Summer Rape”
Claim · model-written summary
Mean RUE was 2.83 g MJ−1 PAR.
- Taxon
- Summer RapeBrassica napust0
- Outcome
- RUEe0
- Value
- 2.83 g MJ −1 PARe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean RUE value was 2.83 g MJ −1 PAR”
t0“Summer Rape”
Claim · model-written summary
Adding pod area to leaf area increased estimated IPAR.
- Taxon
- Summer RapeBrassica napust0
- Treatment
- pod area was added to the leaf areae0
- Outcome
- IPARe0
- Direction
- increasede0
- Comparator
- leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the pod area was added to the leaf area, the IPAR increased”
t0“Summer Rape”
Claim · model-written summary
Adding pod area to leaf area decreased estimated RUE.
- Taxon
- Summer RapeBrassica napust0
- Treatment
- pod area was added to the leaf areae0
- Outcome
- RUEe0
- Direction
- decreasede0
- Comparator
- leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the pod area was added to the leaf area, the IPAR increased and the RUE decreased”
t0“Summer Rape”
The same questions in other papers
density · physiology: photosynthesis · Brassica napus (oilseed rape)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.