Abstract
A number of field experiments were conducted from 1998 to 2001 (or are underway) in northeastern Saskatchewan to determine the effects of various rates (0 to 30 kg S/ha), sources (sulphate S – potassium sulphate and ammonium sulphate; and elemental S – ES 90 and ES 95), times (autumn, sowing, bolting and flowering) and methods (incorporation, sideband, seedrow, topdress and foliar) of S application, ratios of fertilizer N:S (0 to 150 kg N/ha and 0 to 30 kg S/ha) and cultivars (Quantum – Brassica napus, AC Excel – Brassica napus, Maverick – Brassica rapa and AC Parkland – Brassica rapa) on seed yield and quality of canola. The S deficiency on canola can be corrected and seed yields restored with application of sulphate-S fertilizer in the growing season, substantially until bolting growth stage and moderately at early flowering stage. There was no significant increase in seed yield from the elemental S fertilizers in the initial year of application. Even after three annual applications, the elemental S fertilizers had seed yields lower than the sulphate-S fertilizers in many cases particularly when the S fertilizers were applied in spring. Autumn-applied elemental S usually had greater seed yield than the spring-applied elemental S. Autumn-applied ammonium sulphate produced lower seed yield than spring-applied ammonium sulphate in some cases. For higher N application rates, there was a need of increased amount of fertilizer S to adequately meet the S requirements of canola. The severity of S deficiency, increase in seed yield of canola from applied S and seed quality varied with canola cultivars. In general, Quantum had the highest seed yield, followed by AC Excel, Maverick and AC Parkland. Application of S fertilizer also increased oil content in canola seed. In conclusion, seed yield and quality of canola can be optimized with proper S fertilizer management.
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Claims 10
Claim · model-written summary
Growing-season sulphate-S application corrected sulfur deficiency and restored seed yields, especially through bolting.
- Taxon
- canola
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Brassica napus var. napuse0 - Organ / stage
- bolting growth stagee0
- Treatment
- application of sulphate-S fertilizere0
- Outcome
- seed yieldse0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The S deficiency on canola can be corrected and seed yields restored with application of sulphate-S fertilizer in the growing season, substantially until bolting growth stage and moderately at early flowering stage.”
Claim · model-written summary
Sulphate-S application at early flowering moderately restored seed yields.
- Taxon
- canolaBrassica napus var. napuse0
- Organ / stage
- early flowering stagee0
- Treatment
- application of sulphate-S fertilizere0
- Outcome
- seed yieldse0
- Direction
- restorede0
- Qualifier
- moderatelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The S deficiency on canola can be corrected and seed yields restored with application of sulphate-S fertilizer in the growing season, substantially until bolting growth stage and moderately at early flowering stage.”
Claim · model-written summary
Elemental S fertilizers did not significantly increase seed yield in their first application year.
- Taxon
- canola seedBrassica napus var. napust0
- Treatment
- elemental S fertilizerse0
- Outcome
- seed yielde0
- Direction
- no significant increasee0
- Qualifier
- initial year of applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant increase in seed yield from the elemental S fertilizers in the initial year of application.”
t0“canola seed”
Claim · model-written summary
After three annual applications, elemental S often yielded less than sulphate-S, especially with spring applications.
- Taxon
- canola seedBrassica napus var. napust0
- Treatment
- elemental S fertilizerse0
- Outcome
- seed yieldse0
- Direction
- lowere0
- Qualifier
- in many cases particularly when the S fertilizers were applied in springe0
- Comparator
- sulphate-S fertilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Even after three annual applications, the elemental S fertilizers had seed yields lower than the sulphate-S fertilizers in many cases particularly when the S fertilizers were applied in spring.”
t0“canola seed”
Claim · model-written summary
Autumn-applied elemental S usually gave greater seed yield than spring-applied elemental S.
- Taxon
- canola seedBrassica napus var. napust0
- Treatment
- Autumn-applied elemental Se0
- Outcome
- seed yielde0
- Direction
- greatere0
- Comparator
- spring-applied elemental Se0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Autumn-applied elemental S usually had greater seed yield than the spring-applied elemental S.”
t0“canola seed”
Claim · model-written summary
Autumn-applied ammonium sulphate produced lower seed yield than spring application in some cases.
- Taxon
- canola seedBrassica napus var. napust0
- Treatment
- Autumn-applied ammonium sulphatee0
- Outcome
- seed yielde0
- Direction
- lowere0
- Qualifier
- in some casese0
- Comparator
- spring-applied ammonium sulphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Autumn-applied ammonium sulphate produced lower seed yield than spring-applied ammonium sulphate in some cases.”
t0“canola seed”
Claim · model-written summary
Higher nitrogen application rates required more fertilizer sulfur to meet canola sulfur requirements.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- higher N application ratese0
- Outcome
- fertilizer Se0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For higher N application rates, there was a need of increased amount of fertilizer S to adequately meet the S requirements of canola.”
Claim · model-written summary
Canola cultivars varied in sulfur-deficiency severity, yield response to sulfur, and seed quality.
- Taxon
- canolaBrassica napus var. napuse0
- Material
- canola cultivarse0
- Outcome
- severity of S deficiency, increase in seed yield of canola from applied S and seed qualitye0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The severity of S deficiency, increase in seed yield of canola from applied S and seed quality varied with canola cultivars.”
Claim · model-written summary
Quantum had the highest seed yield among the cultivars.
- Taxon
- canola seedBrassica napus var. napust0
- Material
- Quantume0
- Outcome
- seed yielde0
- Direction
- higheste0
- Comparator
- AC Excel, Maverick and AC Parklande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, Quantum had the highest seed yield, followed by AC Excel, Maverick and AC Parkland.”
t0“canola seed”
Claim · model-written summary
Sulfur fertilizer increased canola seed oil content.
- Taxon
- canolaBrassica napus var. napuse0
- Organ / stage
- seede0
- Treatment
- S fertilizere0
- Outcome
- oil contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of S fertilizer also increased oil content in canola seed.”
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