Abstract
Abstract Little information was available on the yield response of canola species to application of sulphur (S) fertilizer at various times after seeding. Split plot experiments having two cultivars, ‘Candle’ (Brassica campestris L.) and ‘Regent’ (Brassica napus L.) as main plots and four times of applying S fertilizer as subplots after seeding (0, 14, 28 and 42 days) were set out on six sulphur deficient soil sites of northern Saskatchewan. Sodium sulphate fertilizer was applied at 25 kg S/ha and all plots received 100, 20 and 50 kg/ha of N, P and K, respectively. The cultivar ‘Regent’ yielded 1.24 t/ha which was significantly higher than ‘Candle’ yielding 0.98 t/ha (average over sites). An estimated linear reduction in yield of canola grain of 0.11 t/ha for ‘Candle’ and 0.40 t/ha for ‘Regent’ was obtained with S applied at 42 days after seeding date. This difference in response to time of S application resulted in a cultivar x time of S interaction. On two other sites testing high in S (above 40 kg S/ha) there was an apparent increase in grain yield with S application at the rosette stage and at the second application time (12 days before reseeding because of frost damage). Sulphur uptake in grain and straw was highly correlated with yield of grain and straw. Average uptake of S in straw (15.1 kg S/ha) was higher than in grain (4.4 kg S/ha). With few exceptions, yield and S uptake in grain and straw was less with S fertilizer applied at late stages of growth than at seeding.
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Claims 10
Claim · model-written summary
Regent yielded 1.24 t/ha, significantly above Candle at 0.98 t/ha.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Material
- ‘Regent’e0
- Outcome
- yieldede0
- Direction
- highere0
- Value
- 1.24 t/hae0
- Qualifier
- 0.98 t/hae0
- Comparator
- ‘Candle’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The cultivar ‘Regent’ yielded 1.24 t/ha which was significantly higher than ‘Candle’ yielding 0.98 t/ha (average over sites)”
t0“canola”
Claim · model-written summary
S application 42 days after seeding was associated with a 0.11 t/ha linear grain yield reduction for Candle.
- Taxon
- canolaBrassica napus var. napuse0
- Material
- ‘Candle’e0
- Treatment
- S applied at 42 days after seeding datee0
- Outcome
- yield of canola graine0
- Direction
- reductione0
- Value
- 0.11 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An estimated linear reduction in yield of canola grain of 0.11 t/ha for ‘Candle’ and 0.40 t/ha for ‘Regent’ was obtained with S applied at 42 days after seeding date”
Claim · model-written summary
S application 42 days after seeding was associated with a 0.40 t/ha linear grain yield reduction for Regent.
- Taxon
- canolaBrassica napus var. napuse0
- Material
- ‘Regent’e0
- Treatment
- S applied at 42 days after seeding datee0
- Outcome
- yield of canola graine0
- Direction
- reductione0
- Value
- 0.40 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An estimated linear reduction in yield of canola grain of 0.11 t/ha for ‘Candle’ and 0.40 t/ha for ‘Regent’ was obtained with S applied at 42 days after seeding date”
Claim · model-written summary
Cultivars differed in yield response to timing of sulfur application.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- time of S applicatione0
- Outcome
- cultivar x time of S interactione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This difference in response to time of S application resulted in a cultivar x time of S interaction”
t0“canola”
Claim · model-written summary
At two high sulfur sites, sulfur application at rosette stage apparently increased grain yield.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S application at the rosette stagee0
- Outcome
- grain yielde0
- Direction
- increasee0
- Setting
- two other sitese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On two other sites testing high in S (above 40 kg S/ha) there was an apparent increase in grain yield with S application at the rosette stage”
t0“canola”
Claim · model-written summary
At two high sulfur sites, sulfur application at the second time apparently increased grain yield.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- second application timee0
- Outcome
- grain yielde0
- Direction
- increasee0
- Qualifier
- 12 days before reseeding because of frost damagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was an apparent increase in grain yield with S application at the rosette stage and at the second application time (12 days before reseeding because of frost damage)”
t0“canola”
Claim · model-written summary
Sulfur uptake in grain and straw was highly correlated with their yields.
- Taxon
- canolaBrassica napus var. napust0
- Organ / stage
- grain and strawe0
- Outcome
- yield of grain and strawe0
- Qualifier
- Sulphur uptake in grain and strawe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sulphur uptake in grain and straw was highly correlated with yield of grain and straw”
t0“canola”
Claim · model-written summary
Average sulfur uptake was higher in straw than grain.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- uptake of S in strawe0
- Direction
- highere0
- Value
- 15.1 kg S/hae0
- Qualifier
- 4.4 kg S/hae0
- Comparator
- graine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average uptake of S in straw (15.1 kg S/ha) was higher than in grain (4.4 kg S/ha)”
t0“canola”
Claim · model-written summary
Late sulfur fertilization generally reduced grain yield relative to fertilization at seeding.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S fertilizer applied at late stages of growthe0
- Outcome
- yielde0
- Direction
- lesse0
- Comparator
- at seedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With few exceptions, yield and S uptake in grain and straw was less with S fertilizer applied at late stages of growth than at seeding”
t0“canola”
Claim · model-written summary
Late sulfur fertilization generally reduced sulfur uptake in grain and straw relative to fertilization at seeding.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- S fertilizer applied at late stages of growthe0
- Outcome
- S uptake in grain and strawe0
- Direction
- lesse0
- Comparator
- at seedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With few exceptions, yield and S uptake in grain and straw was less with S fertilizer applied at late stages of growth than at seeding”
t0“canola”
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