Abstract
SUMMARY Field experiments were conducted to test the seed yield responses of winter oilseed rape ( Brassica napus L., cvs Libravo or Falcon) to the addition of different rates of S fertilizer, at three N application rates, on a sandy loam at Woburn, Bedfordshire, in 1990/91, 1991/92 and 1993/94. Large increases in seed yields, ranging from 0·7 to 1·6 t/ha, or 42–267% on a relative scale, were obtained in response to the application of 40 kg S/ha with 180 and 230 kg N/ha treatments. The effects of S were highly significant in 1991/92 ( P < 0·01) and 1993/94 ( P < 0·001) and close to significant ( P = 0·053) in 1990/91. The yield benefits were obtained mainly from the application of the first 10 kg S/ha and further yield increases were unlikely above 40 kg S/ha. Increasing N application from 180 to 230 kg/ha decreased seed yield in 1990/91 and 1993/94, when no S was applied. In contrast, seed yield was not increased by S at zero or low (50 or 100 kg/ha) N rates. The interactions between N and S on seed yield were significant ( P < 0·05) in 1990/91 but not in the other two seasons. Application of S also increased seed oil content in 1993/94, when the degree of S deficiency was particularly severe. With an application of 230 kg N/ha, the crops took up 5–22 kg S/ha at maturity when no S was applied and 26–51 kg S/ha when 40 kg S/ha was applied. The utilization efficiency of the fertilizer S ranged from 50 to 73% in the three seasons. Although the concentrations of total N in plants were largely unaffected by S treatments, large amounts of NO 3 -N accumulated in the leaves of S-deficient plants in 1993/94. This indicates that N metabolism was disrupted by S deficiency. The concentrations of S and the N: S ratios in different tissues and the whole plant changed considerably with time. The concentration of S in leaves at early flowering was found to be the best index in predicting S deficiency in terms of seed yield, and a critical value of 3·8 mg/g was obtained. In comparison, the N: S ratio in leaves at early flowering was a much poorer predictor of S deficiency.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
Sulphur at 40 kg/ha raised seed yield by 0·7 to 1·6 t/ha at the two higher nitrogen rates.
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- 40 kg S/hae0
- Outcome
- seed yieldse0
- Direction
- increasese0
- Value
- 0·7 to 1·6 t/hae0
- Qualifier
- 180 and 230 kg N/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“Large increases in seed yields, ranging from 0·7 to 1·6 t/ha, or 42–267% on a relative scale, were obtained in response to the application of 40 kg S/ha with 180 and 230 kg N/ha treatments”
Claim · model-written summary
Most seed-yield benefit came from the first 10 kg S/ha.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- first 10 kg S/hae0
- Outcome
- yield benefitse0
- Direction
- benefitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“The yield benefits were obtained mainly from the application of the first 10 kg S/ha”
Claim · model-written summary
Further yield increases were unlikely beyond 40 kg S/ha.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- yield increasese0
- Qualifier
- above 40 kg S/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“further yield increases were unlikely above 40 kg S/ha”
Claim · model-written summary
Raising nitrogen from 180 to 230 kg/ha decreased seed yield without sulphur in two seasons.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- 230 kg/hae0
- Outcome
- seed yielde0
- Direction
- decreasede0
- Qualifier
- when no S was appliede0
- Comparator
- 180e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“Increasing N application from 180 to 230 kg/ha decreased seed yield in 1990/91 and 1993/94, when no S was applied”
Claim · model-written summary
Sulphur did not increase seed yield with zero or low nitrogen rates.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- Se0
- Outcome
- seed yielde0
- Direction
- not increasede0
- Qualifier
- zero or low (50 or 100 kg/ha) N ratese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“seed yield was not increased by S at zero or low (50 or 100 kg/ha) N rates”
Claim · model-written summary
Nitrogen and sulphur interactions on seed yield were significant in 1990/91 but not the other seasons.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N and Se0
- Outcome
- seed yielde0
- Qualifier
- 1990/91 but not in the other two seasonse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“The interactions between N and S on seed yield were significant ( P < 0·05) in 1990/91 but not in the other two seasons”
Claim · model-written summary
Sulphur increased seed oil content in the severely deficient 1993/94 season.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- Se0
- Outcome
- seed oil contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“Application of S also increased seed oil content in 1993/94, when the degree of S deficiency was particularly severe”
Claim · model-written summary
Crops took up 5–22 kg S/ha at maturity with 230 kg N/ha and no added sulphur.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- took upe0
- Value
- 5–22 kg S/hae0
- Qualifier
- when no S was appliede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“the crops took up 5–22 kg S/ha at maturity when no S was applied”
Claim · model-written summary
Crops took up 26–51 kg S/ha at maturity with 40 kg S/ha added.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- 26–51 kg S/hae0
- Value
- 26–51 kg S/hae0
- Qualifier
- 40 kg S/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“26–51 kg S/ha when 40 kg S/ha was applied”
Claim · model-written summary
Fertilizer sulphur utilization efficiency ranged from 50 to 73%.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- utilization efficiency of the fertilizer Se0
- Value
- 50 to 73%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“The utilization efficiency of the fertilizer S ranged from 50 to 73% in the three seasons”
Claim · model-written summary
Sulphur treatment largely did not affect total plant nitrogen concentration.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- S treatmentse0
- Outcome
- concentrations of total N in plantse0
- Direction
- largely unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“concentrations of total N in plants were largely unaffected by S treatments”
Claim · model-written summary
Large amounts of nitrate nitrogen accumulated in leaves of sulphur-deficient plants in 1993/94.
- Taxon
- winter oilseed rapeBrassica napust0
- Organ / stage
- leavese0
- Outcome
- NO 3 -N accumulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“large amounts of NO 3 -N accumulated in the leaves of S-deficient plants in 1993/94”
Claim · model-written summary
The authors interpreted nitrate accumulation as evidence of disrupted nitrogen metabolism under sulphur deficiency.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- N metabolism was disruptede0
- Qualifier
- S deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“This indicates that N metabolism was disrupted by S deficiency”
Claim · model-written summary
Sulphur concentration and nitrogen:sulphur ratios varied considerably with time across tissues.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- concentrations of S and the N: S ratiose0
- Direction
- changed considerablye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“The concentrations of S and the N: S ratios in different tissues and the whole plant changed considerably with time”
Claim · model-written summary
Leaf sulphur concentration at early flowering best predicted yield-related sulphur deficiency, with a critical value of 3·8 mg/g.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- best index in predicting S deficiency in terms of seed yielde0
- Value
- 3·8 mg/ge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“The concentration of S in leaves at early flowering was found to be the best index in predicting S deficiency in terms of seed yield, and a critical value of 3·8 mg/g was obtained”
Claim · model-written summary
The leaf nitrogen:sulphur ratio was a poorer predictor of deficiency than leaf sulphur concentration.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- predictor of S deficiencye0
- Direction
- poorere0
- Comparator
- N: S ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“the N: S ratio in leaves at early flowering was a much poorer predictor of S deficiency”
The same questions in other papers
sulfur atom · quality: oil · Brassica napus (oilseed rape)Results differ
18 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- positive
20 papers more in this group
See all 24 papers →sulfur atom · yield · Brassica napus (oilseed rape)Results differ
9 papers in the same direction as this paper · 49 in the opposite direction
- positive
- positive
- positive
55 papers more in this group
See all 59 papers →sulfur atom · nutrient: content · Brassica napus (oilseed rape)Positive and negative results
4 papers in the same direction as this paper · 19 in the opposite direction
- positive
- positive
- positive
20 papers more in this group
See all 24 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.