Abstract
On marginally S-deficient soils in the Parkland region, application of high rates of N and other fertilizers in combination with more frequent productionof canola (Brassica napus L. or B. rapa L.) causes rapid depletion of S and nutrient imbalance in soil, and S deficiency and yield reductionfor canola. Field experiments on Gray Luvisol (Boralfs) soils deficient in available N and S were conducted in northeastern Saskatchewan. Interactive effects of N (0, 50 100 and 150 kg N ha -1 ) and S (0, 10, 20 and 30 kg S ha -1 ) rates on yield, seed quality, and uptake of S and N in canola were determined. In the absence of S application, increasing N rate made the S deficiency symptoms more severe, and reduced yield, S concentration, oil concentration, S uptake and N uptake of seed, but there was a general response of no effect or some increase in protein concentration, S and N uptakein straw up to 50 or 100 kg N ha -1 . When S was applied, canola yield, S concentration, S uptake and N uptake of seed as well as the yield and S uptake of straw increased with increasing N rate. Irrespective of S rate, fertilizer N reduced oil concentration and increased protein concentrationin canola seed. With S fertilization, yield, S uptake and N uptake of seed and straw, and total S concentration and oil concentration in seed were substantially increased, whereas there was no consistent change in protein concentration of seed. The response of these parameters to S application was generally greater at higher N rates. Sulphur and N uptake measured data indicated that significant N × S interaction effects were more frequent and pronounced for seed yield than for straw yield, indicating that the response to N rate was relatively more dependent on the S level for seed than for straw. In summary, the results suggest that an increased amount of S is needed on these S-deficient Gray Luvisol soils in northeastern Saskatchewan to adequately meet the S requirements at high N rates for optimum yield and quality of canola. Key words: Canola, N and S concentration and uptake, N and S fertilization, oil concentration, S-deficient soil, seed yield and quality
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 13
Claim · model-written summary
Without sulfur, greater nitrogen made canola sulfur deficiency symptoms more severe.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Treatment
- increasing N ratee0
- Outcome
- S deficiency symptomse0
- Direction
- more severee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In the absence of S application, increasing N rate made the S deficiency symptoms more severe”
t0“canola”
Claim · model-written summary
Without sulfur, greater nitrogen reduced canola yield and seed sulfur and oil concentration and sulfur and nitrogen uptake.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- increasing N ratee1
- Outcome
- yield, S concentration, oil concentration, S uptake and N uptake of seede0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced yield, S concentration, oil concentration, S uptake and N uptake of seed”
e1“absence of S application, increasing N rate”
t0“canola”
Claim · model-written summary
Without sulfur, nitrogen caused no effect or some increase in seed protein concentration and straw sulfur and nitrogen uptake up to 50 or 100 kg N ha -1.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- increasing N ratee1
- Outcome
- protein concentration, S and N uptakein strawe0
- Direction
- no effect or some increasee0
- Qualifier
- up to 50 or 100 kg N ha -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effect or some increase in protein concentration, S and N uptakein straw up to 50 or 100 kg N ha -1”
e1“absence of S application, increasing N rate”
t0“canola”
Claim · model-written summary
With sulfur, increasing nitrogen raised canola yield, seed sulfur concentration and seed sulfur and nitrogen uptake.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- increasing N ratee0
- Outcome
- canola yield, S concentration, S uptake and N uptake of seede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When S was applied, canola yield, S concentration, S uptake and N uptake of seed as well as the yield and S uptake of straw increased with increasing N rate”
Claim · model-written summary
With sulfur, increasing nitrogen raised straw yield and sulfur uptake.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- increasing N ratee0
- Outcome
- yield and S uptake of strawe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yield and S uptake of straw increased with increasing N rate”
t0“canola”
Claim · model-written summary
At any sulfur rate, nitrogen reduced canola seed oil concentration.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- fertilizer Ne0
- Outcome
- oil concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrespective of S rate, fertilizer N reduced oil concentration and increased protein concentrationin canola seed”
Claim · model-written summary
At any sulfur rate, nitrogen increased canola seed protein concentration.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- fertilizer Ne0
- Outcome
- protein concentrationin canola seede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer N reduced oil concentration and increased protein concentrationin canola seed”
Claim · model-written summary
Sulfur fertilization substantially increased canola seed and straw yield and sulfur and nitrogen uptake.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S fertilizatione0
- Outcome
- yield, S uptake and N uptake of seed and strawe0
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With S fertilization, yield, S uptake and N uptake of seed and straw”
e1“were substantially increased”
t0“canola”
Claim · model-written summary
Sulfur fertilization substantially increased canola seed sulfur and oil concentration.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S fertilizatione1
- Outcome
- total S concentration and oil concentration in seede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total S concentration and oil concentration in seed were substantially increased”
e1“With S fertilization”
t0“canola”
Claim · model-written summary
Sulfur fertilization did not consistently change canola seed protein concentration.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S fertilizatione1
- Outcome
- protein concentration of seede0
- Direction
- no consistent changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no consistent change in protein concentration of seed”
e1“With S fertilization”
t0“canola”
Claim · model-written summary
Responses to sulfur application were generally greater at higher nitrogen rates.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S applicatione0
- Outcome
- response of these parameterse0
- Direction
- greatere0
- Qualifier
- higher N ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of these parameters to S application was generally greater at higher N rates”
t0“canola”
Claim · model-written summary
Nitrogen by sulfur interactions were more frequent and pronounced for seed yield than straw yield.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- N × S interactione0
- Outcome
- seed yielde0
- Direction
- more frequent and pronouncede0
- Comparator
- straw yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant N × S interaction effects were more frequent and pronounced for seed yield than for straw yield”
t0“canola”
Claim · model-written summary
The authors conclude that higher sulfur supply is needed at high nitrogen rates for optimum canola yield and quality on these soils.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- an increased amount of S is needede0
- Qualifier
- high N ratese0
- Setting
- northeastern Saskatchewane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increased amount of S is needed on these S-deficient Gray Luvisol soils in northeastern Saskatchewan to adequately meet the S requirements at high N rates for optimum yield and quality of canola”
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
- positive
- positive
- no effect
20 papers more in this group
See all 24 papers →sulfur atom · yield · Brassica napus (oilseed rape)Results differ
48 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
55 papers more in this group
See all 59 papers →fertilization · quality: protein · Brassica napus (oilseed rape)Results differ
20 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
25 papers more in this group
See all 29 papers →fertilization · quality: oil · Brassica napus (oilseed rape)Results differ
41 papers in the same direction as this paper · 20 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- negative
59 papers more in this group
See all 63 papers →nitrogen · quality: oil · Brassica napus (oilseed rape)Results differ
30 papers in the same direction as this paper · 33 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- positive
- negative
60 papers more in this group
See all 64 papers →nitrogen · disease · Brassica napus (oilseed rape)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →nitrogen · yield · Brassica napus (oilseed rape)Positive and negative results
197 papers in the same direction as this paper · 34 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
- positive
235 papers more in this group
See all 239 papers →fertilization · yield · Brassica napus (oilseed rape)Positive and negative results
336 papers in the same direction as this paper · 37 in the opposite direction · 4 reporting no difference from an alternative
- no effect
- positive
- positive
374 papers more in this group
See all 378 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.