Abstract
The effects of plant density on the growth and yield of winter oilseed rape ( Brassica napus ) were examined in a series of five multifactorial experiments at Rothamsted Experimental Station between 1984 and 1989. Plant densities, manipulated by changing the seed rate and row spacing, or because of overwinter losses, ranged from 13·5 to 372 plants/m 2 . Normalized yields for the multifactorial plots increased with densities up to 50–60 plants/m 2 . In very high density plots in 1987/88, yield decreased as density increased >150 plants/m 2 . Plants grown at high density had fewer pod-bearing branches per plant but produced more branches/m 2 . Branch dry matter (DM) per plant was decreased by 42%, the number of fertile pods per plant and pod DM/plant by 37%. There was no effect of density on the number or DM of pods/m 2 . Over 74% of the fertile pods were carried on the terminal and uppermost branches of plants grown at high density in 1987/88 compared with only 34% in plants grown at low density in 1988/89. Seed DM/plant decreased with increase in density but seed size (1000-seed weight) increased. There was no effect of density on seed glucosinolate or oil contents.
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Claims 11
Claim · model-written summary
Normalized yield increased with density up to 50–60 plants/m 2.
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- densities up to 50–60 plants/m 2e0
- Outcome
- Normalized yieldse0
- Direction
- increasede0
- Value
- 50–60 plants/m 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Normalized yields for the multifactorial plots increased with densities up to 50–60 plants/m 2 .”
t0“winter oilseed rape”
Claim · model-written summary
Yield decreased above 150 plants/m 2 in very high density plots.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- density increased >150 plants/m 2e0
- Outcome
- yielde0
- Direction
- decreasede0
- Value
- >150 plants/m 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In very high density plots in 1987/88, yield decreased as density increased >150 plants/m 2 .”
t0“winter oilseed rape”
Claim · model-written summary
High-density plants had fewer pod-bearing branches per plant.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- high densitye0
- Outcome
- pod-bearing branches per plante0
- Direction
- fewere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at high density had fewer pod-bearing branches per plant but produced more branches/m 2 .”
t0“winter oilseed rape”
Claim · model-written summary
High-density plants produced more branches per square metre.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- high densitye0
- Outcome
- branches/m 2e0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at high density had fewer pod-bearing branches per plant but produced more branches/m 2 .”
t0“winter oilseed rape”
Claim · model-written summary
Branch dry matter per plant decreased by 42% at high density.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- Branch dry matter (DM) per plante0
- Direction
- decreasede0
- Value
- 42%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Branch dry matter (DM) per plant was decreased by 42%”
t0“winter oilseed rape”
Claim · model-written summary
Fertile pods per plant and pod dry matter per plant decreased by 37%.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- number of fertile pods per plant and pod DM/plante0
- Value
- 37%e0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of fertile pods per plant and pod DM/plant by 37%”
t0“winter oilseed rape”
Claim · model-written summary
Pod number and dry matter per square metre did not change with density.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- densitye0
- Outcome
- number or DM of pods/m 2e0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no effect of density on the number or DM of pods/m 2 .”
t0“winter oilseed rape”
Claim · model-written summary
More than 74% of fertile pods were on terminal and uppermost branches at high density, versus 34% at low density.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- fertile pods were carried on the terminal and uppermost branchese0
- Value
- Over 74%e0
- Qualifier
- 34%e0
- Comparator
- plants grown at low densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over 74% of the fertile pods were carried on the terminal and uppermost branches of plants grown at high density in 1987/88 compared with only 34% in plants grown at low density in 1988/89.”
t0“winter oilseed rape”
Claim · model-written summary
Seed dry matter per plant decreased as density increased.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- increase in densitye0
- Outcome
- Seed DM/plante0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed DM/plant decreased with increase in density but seed size (1000-seed weight) increased.”
t0“winter oilseed rape”
Claim · model-written summary
Thousand-seed weight increased as density increased.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- increase in densitye0
- Outcome
- seed size (1000-seed weight)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed DM/plant decreased with increase in density but seed size (1000-seed weight) increased.”
t0“winter oilseed rape”
Claim · model-written summary
Density did not affect seed glucosinolate or oil content.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- densitye0
- Outcome
- seed glucosinolate or oil contentse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no effect of density on seed glucosinolate or oil contents.”
t0“winter oilseed rape”
The same questions in other papers
density · quality: phytochemicals · Brassica napus (oilseed rape)Positive and negative results
1 in the opposite direction
- positive
density · growth · Brassica napus (oilseed rape)Positive and negative results
8 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
21 papers more in this group
See all 25 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.