Abstract
Summary Experiments made between 1967 and 1970 tested the effects of sowing oilseed rape on different dates in autumn and spring. Much greater oil yields were obtained from autumn sowings, due to higher seed yields and oil content, but the effect varied considerably between experiments, varieties and seasons. Autumn-sown crops flowered in late April or early May, and by the time pods were developing rapidly in June the leaves had senesced almost completely. Spring-sown varieties followed a similar pattern but about a month later, and did not reach the same peak in pod growth. There was a major effect of sowing date, late-autumn sowings (after mid-September) giving lower yields than early-spring sowings. The best autumn sowings (early September) gave about 3 t/ha of seed, but late sowings less than half this; oil content also decreased with delay in sowing – from 45% to as low as 38%. Delayed sowing restricted growth, leaf area and pod production, and also had a slight effect on seed weight. Frost damage on flower buds appeared to be the cause of reduced yield from early sowing (August) in one experiment. In spring, the earliest sowing (late March) gave the best yields. Vigorous but late vegetative growth from the latest sowing (end of April) did not lead to high yields, possibly due to pest and disease effects.
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Claims 15
Claim · model-written summary
Autumn sowings gave greater oil yields than spring sowings.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- autumn sowingse0
- Outcome
- oil yieldse0
- Direction
- greatere0
- Comparator
- springe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Much greater oil yields were obtained from autumn sowings, due to higher seed yields and oil content”
t0“oilseed rape (Brassica napus)”
e1“Spring-sown varieties followed a similar pattern but about a month later”
Claim · model-written summary
Autumn sowings had higher seed yields.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- autumn sowingse0
- Outcome
- seed yieldse0
- Direction
- highere0
- Comparator
- springe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“autumn sowings, due to higher seed yields and oil content”
t0“oilseed rape (Brassica napus)”
e1“Spring-sown varieties followed a similar pattern but about a month later”
Claim · model-written summary
Autumn sowings had higher oil content.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- autumn sowingse0
- Outcome
- oil contente0
- Direction
- highere0
- Comparator
- springe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“autumn sowings, due to higher seed yields and oil content”
t0“oilseed rape (Brassica napus)”
e1“Spring-sown varieties followed a similar pattern but about a month later”
Claim · model-written summary
Autumn-sown crops flowered in late April or early May.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- flowerede0
- Value
- late April or early Maye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Autumn-sown crops flowered in late April or early May”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Spring-sown varieties followed the autumn developmental pattern about a month later.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- similar patterne0
- Value
- about a month latere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring-sown varieties followed a similar pattern but about a month later”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Spring-sown varieties did not reach the autumn peak in pod growth.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- peak in pod growthe0
- Direction
- did not reache0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not reach the same peak in pod growth”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Late-autumn sowing yielded less than early-spring sowing.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- late-autumn sowings (after mid-September)e0
- Outcome
- yieldse0
- Direction
- lowere0
- Comparator
- early-spring sowingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-autumn sowings (after mid-September) giving lower yields than early-spring sowings”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Early September autumn sowing gave about 3 t/ha seed yield.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- autumn sowings (early September)e0
- Outcome
- seede0
- Direction
- beste0
- Value
- about 3 t/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The best autumn sowings (early September) gave about 3 t/ha of seed”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Late sowings yielded less than half the early September sowings.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- late sowingse0
- Outcome
- seede2
- Direction
- less than halfe0
- Comparator
- early Septembere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but late sowings less than half this”
t0“oilseed rape (Brassica napus)”
e1“early September”
e2“3 t/ha of seed”
Claim · model-written summary
Oil content declined with delayed sowing from 45% to as low as 38%.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- delay in sowinge0
- Outcome
- oil contente0
- Direction
- decreasede0
- Value
- 45% to as low as 38%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oil content also decreased with delay in sowing – from 45% to as low as 38%”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Delayed sowing restricted growth, leaf area and pod production.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- Delayed sowinge0
- Outcome
- growth, leaf area and pod productione0
- Direction
- restrictede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed sowing restricted growth, leaf area and pod production”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
Delayed sowing slightly affected seed weight.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- Delayed sowinge1
- Outcome
- seed weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“also had a slight effect on seed weight”
t0“oilseed rape (Brassica napus)”
e1“Delayed sowing”
Claim · model-written summary
Frost damage to flower buds appeared to reduce yield from August sowing in one experiment.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- early sowing (August)e0
- Outcome
- reduced yielde0
- Qualifier
- Frost damage on flower budse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Frost damage on flower buds appeared to be the cause of reduced yield from early sowing (August) in one experiment”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
The earliest spring sowing gave the best yields.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- earliest sowing (late March)e0
- Outcome
- yieldse0
- Direction
- beste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the earliest sowing (late March) gave the best yields”
t0“oilseed rape (Brassica napus)”
Claim · model-written summary
The latest sowing had vigorous but late vegetative growth without high yield.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- latest sowing (end of April)e0
- Outcome
- high yieldse0
- Direction
- did not lead toe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vigorous but late vegetative growth from the latest sowing (end of April) did not lead to high yields”
t0“oilseed rape (Brassica napus)”
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