Abstract
In northeastern Saskatchewan on Gray Luvisolic soils, rapeseed (Brassica napus L. and B. campestris L.) grown on many fields does not set seed, possibly because of deficiencies of S and B. Therefore, experiments were begun in 1979 to determine (1) the effect of N, S and B fertilizers on yield and quality of rapeseed; (2) if cultivars (B. napus and B. campestris L.) responded differently to these nutrients; and (3) nutrient and nutrient interaction effects of five rates of N, S and B in a composite rotatable design on yield and quality of the cultivar Regent (B. napus L.). Rates of up to 200 kg N ha −1 , 50 kg S ha −1 and 2.8 kg B ha −1 were applied. The experiments were conducted on 13 sites. Nine were in N.E. Saskatchewan on Sylvania f1, Waitville 1 (Luvisolic) and Melfort sicl (Black Chernozemic) soils. Four were in N.W. Saskatchewan on Loon River 1 and Waitville 1, (Luvisolic) soils. In N.W. Saskatchewan there was a significant yield increase because of N (1.00 t ha −1 ) and S (1.06 t ha −1 ). In N.E. Saskatchewan on Sylvania f1, rapeseed yields were increased by 0.38 t ha −1 by a combination of S and B and by 0.78 t ha −1 by N. Sylvania f1 soils were lower in soluble B than other experimental sites. At other sites in N.E. Saskatchewan, N but not S increased rapeseed grain yield significantly. Significant response to a combination of S and B was obtained with the cultivar Regent, and both species of rapeseed responded to S fertilizer. Sulphur fertilizer increased the glucosinolate concentration in rapeseed meal at all sites. Sulphur increased oil concentration of rapeseed on all sites except one where frost damaged the crop and increased protein of grain on sites where there was yield response to S. Nitrogen increased protein of rapeseed grown on all sites whereas N combined with B decreased protein and increased oil percentage on all sites except Sylvania f1. The yield response of the cultivar Regent to B was not significantly related to soluble soil B. The combined yield response to S and B in relation to soluble soil S and B was significant (R 2 = 0.60). Yield response of rapeseed to S was significantly related to soluble soil S (R 2 = 0.35). In conclusion, S fertilizer solved the problem of poor seed set in rapeseed cultivars, but B also enhanced yield by decreasing the number of sterile florets and improving pod development. Key words: Nitrogen, sulphur, boron, rapeseed, oil, protein, glucosinolates
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Claims 20
Claim · model-written summary
In N.W. Saskatchewan, nitrogen increased rapeseed yield by 1.00 t ha −1.
- Taxon
- rapeseedt0
- Treatment
- Ne0
- Outcome
- yielde0
- Direction
- increasee0
- Value
- 1.00 t ha −1e0
- Setting
- N.W. Saskatchewane0
Not reportedComparator
Verbatim
t0“RAPESEED”
e0“In N.W. Saskatchewan there was a significant yield increase because of N (1.00 t ha −1 ) and S (1.06 t ha −1 )”
Claim · model-written summary
In N.W. Saskatchewan, sulphur increased rapeseed yield by 1.06 t ha −1.
- Taxon
- rapeseedt0
- Treatment
- Se0
- Outcome
- yielde0
- Direction
- increasee0
- Value
- 1.06 t ha −1e0
- Setting
- N.W. Saskatchewane0
Not reportedComparator
Verbatim
t0“RAPESEED”
e0“In N.W. Saskatchewan there was a significant yield increase because of N (1.00 t ha −1 ) and S (1.06 t ha −1 )”
Claim · model-written summary
In N.E. Saskatchewan on Sylvania f1, a combination of S and B increased rapeseed yield by 0.38 t ha −1.
- Taxon
- rapeseedt0
- Treatment
- a combination of S and Be1
- Outcome
- rapeseed yieldse1
- Direction
- increasede1
- Value
- 0.38 t ha −1e1
- Setting
- N.E. Saskatchewan on Sylvania f1e1
Not reportedComparator
Verbatim
t0“RAPESEED”
e1“In N.E. Saskatchewan on Sylvania f1, rapeseed yields were increased by 0.38 t ha −1 by a combination of S and B and by 0.78 t ha −1 by N”
Claim · model-written summary
In N.E. Saskatchewan on Sylvania f1, nitrogen increased rapeseed yield by 0.78 t ha −1.
- Taxon
- rapeseedt0
- Treatment
- Ne1
- Outcome
- rapeseed yieldse1
- Direction
- increasede1
- Value
- 0.78 t ha −1e1
- Setting
- N.E. Saskatchewan on Sylvania f1e1
Not reportedComparator
Verbatim
t0“RAPESEED”
e1“In N.E. Saskatchewan on Sylvania f1, rapeseed yields were increased by 0.38 t ha −1 by a combination of S and B and by 0.78 t ha −1 by N”
Claim · model-written summary
Sylvania f1 soils were lower in soluble B than other experimental sites.
Not reportedTaxon
Verbatim
e2“Sylvania f1 soils were lower in soluble B than other experimental sites”
Claim · model-written summary
At other sites in N.E. Saskatchewan, nitrogen but not sulphur increased rapeseed grain yield significantly.
Verbatim
t0“RAPESEED”
e3“At other sites in N.E. Saskatchewan, N but not S increased rapeseed grain yield significantly”
Claim · model-written summary
The cultivar Regent responded significantly to a combination of S and B.
Not reportedComparatorDirection
Verbatim
t0“RAPESEED”
e4“Significant response to a combination of S and B was obtained with the cultivar Regent”
Claim · model-written summary
Both species of rapeseed responded to sulphur fertilizer.
Not reportedComparatorDirection
Verbatim
t0“RAPESEED”
e4“both species of rapeseed responded to S fertilizer”
Claim · model-written summary
Sulphur fertilizer increased glucosinolate concentration in rapeseed meal at all sites.
- Taxon
- rapeseedt0
- Treatment
- Sulphur fertilizere5
- Outcome
- glucosinolate concentratione5
- Direction
- increasede5
- Setting
- all sitese5
Not reportedComparator
Verbatim
t0“RAPESEED”
e5“Sulphur fertilizer increased the glucosinolate concentration in rapeseed meal at all sites”
Claim · model-written summary
Sulphur increased oil concentration of rapeseed on all sites except one where frost damaged the crop.
- Taxon
- rapeseedt0
- Treatment
- Sulphure6
- Outcome
- oil concentratione6
- Direction
- increasede6
- Qualifier
- except one where frost damaged the crope6
Not reportedComparator
Verbatim
t0“RAPESEED”
e6“Sulphur increased oil concentration of rapeseed on all sites except one where frost damaged the crop”
Claim · model-written summary
Sulphur increased grain protein on sites with a yield response to sulphur.
- Taxon
- rapeseedt0
- Treatment
- Se7
- Outcome
- protein of graine7
- Direction
- increasede7
- Qualifier
- on sites where there was yield response to Se7
Not reportedComparator
Verbatim
t0“RAPESEED”
e7“increased protein of grain on sites where there was yield response to S”
Claim · model-written summary
Nitrogen increased rapeseed protein on all sites.
Not reportedComparator
Verbatim
t0“RAPESEED”
e0“Nitrogen increased protein of rapeseed grown on all sites”
Claim · model-written summary
Nitrogen combined with boron decreased rapeseed protein on all sites except Sylvania f1.
- Taxon
- rapeseedt0
- Treatment
- N combined with Be1
- Outcome
- proteine1
- Direction
- decreasede1
- Qualifier
- on all sites except Sylvania f1e1
Not reportedComparator
Verbatim
t0“RAPESEED”
e1“N combined with B decreased protein and increased oil percentage on all sites except Sylvania f1”
Claim · model-written summary
Nitrogen combined with boron increased rapeseed oil percentage on all sites except Sylvania f1.
- Taxon
- rapeseedt0
- Treatment
- N combined with Be1
- Outcome
- oil percentagee1
- Direction
- increasede1
- Qualifier
- on all sites except Sylvania f1e1
Not reportedComparator
Verbatim
t0“RAPESEED”
e1“N combined with B decreased protein and increased oil percentage on all sites except Sylvania f1”
Claim · model-written summary
The yield response of cultivar Regent to boron was not significantly related to soluble soil B.
Verbatim
t0“RAPESEED”
e0“The yield response of the cultivar Regent to B was not significantly related to soluble soil B”
Claim · model-written summary
The combined yield response to sulphur and boron was significantly related to soluble soil S and B (R 2 = 0.60).
Not reportedDirection
Verbatim
t0“RAPESEED”
e0“The combined yield response to S and B in relation to soluble soil S and B was significant (R 2 = 0.60)”
Claim · model-written summary
Yield response of rapeseed to sulphur was significantly related to soluble soil S (R 2 = 0.35).
Not reportedDirection
Verbatim
t0“RAPESEED”
e0“Yield response of rapeseed to S was significantly related to soluble soil S (R 2 = 0.35)”
Claim · model-written summary
Sulphur fertilizer solved the problem of poor seed set in rapeseed cultivars.
Not reportedComparator
Verbatim
t0“RAPESEED”
e0“S fertilizer solved the problem of poor seed set in rapeseed cultivars”
Claim · model-written summary
Boron enhanced rapeseed yield.
Not reportedComparator
Verbatim
t0“RAPESEED”
e0“B also enhanced yield by decreasing the number of sterile florets and improving pod development”
Claim · model-written summary
Boron enhanced rapeseed yield by decreasing sterile florets and improving pod development.
Verbatim
t0“RAPESEED”
e0“B also enhanced yield by decreasing the number of sterile florets and improving pod development”
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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.