Abstract
Polymer seed coatings offer an opportunity to fall seed Brassica napus earlier in October, thus avoiding difficult seeding conditions (wet/frozen soils) common in late October or early November. A multi-year field experiment was conducted at four locations in Alberta, Canada, to investigate the effect of early (mid-October) and late fall (late October-early November) canola seeding with and without a germination-inhibiting polymer seed coat. Yield and yield components were determined in glufosinate (hybrid and open-pollinated), glyphosate (open-pollinated), and imidazolinone (open-pollinated) herbicidetolerant canola cultivars. Early-seeded canola without the polymer coat had a reduced plant density of 58% compared to late-fall-seeded canola. Application of the polymer coat on early-seeded canola increased plant density by 80% compared to uncoated seed. Seed yield and dockage were not affected by seeding date when a polymer seed coating was used. Without the polymer seed coat, canola yield was reduced 42% and dockage increased 6% when seeding occurred in early vs. late fall. Increased pod production from early-fall-seeded uncoated canola compared to other seeding dates could only partially compensate for canola yield. Cultivar interactions generally were not agronomically important. The use of polymer seed coatings with all these herbicide-tolerant cultivars will allow producers to seed earlier in fall, rather than waiting for cooler soil conditions in late fall. Key words: Canola (Brassica napus L.), dormant seeding, polymer seed coating
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Claims 8
Claim · model-written summary
Early-seeded canola without the polymer coat had a 58% lower plant density than late-fall-seeded canola.
- Taxon
- canola
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Brassica napus var. napust0 - Treatment
- Early-seeded canola without the polymer coate0
- Outcome
- plant densitye0
- Direction
- reducede0
- Value
- 58%e0
- Comparator
- late-fall-seeded canolae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e0“Early-seeded canola without the polymer coat had a reduced plant density of 58% compared to late-fall-seeded canola”
Claim · model-written summary
The polymer coat on early-seeded canola increased plant density by 80% compared with uncoated seed.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- polymer coate1
- Outcome
- plant densitye1
- Direction
- increasede1
- Value
- 80%e1
- Comparator
- uncoated seede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e1“Application of the polymer coat on early-seeded canola increased plant density by 80% compared to uncoated seed”
Claim · model-written summary
Seed yield and dockage were not affected by seeding date when a polymer seed coating was used.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- polymer seed coatinge2
- Outcome
- Seed yield and dockagee2
- Direction
- not affectede2
- Comparator
- seeding datee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e2“Seed yield and dockage were not affected by seeding date when a polymer seed coating was used”
Claim · model-written summary
Without the polymer seed coat, canola yield was 42% lower when seeded early rather than late in fall.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Without the polymer seed coate3
- Outcome
- canola yielde3
- Direction
- reducede3
- Value
- 42%e3
- Comparator
- late falle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e3“Without the polymer seed coat, canola yield was reduced 42% and dockage increased 6% when seeding occurred in early vs. late fall”
Claim · model-written summary
Without the polymer seed coat, dockage was 6% higher when canola was seeded early rather than late in fall.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Without the polymer seed coate3
- Outcome
- dockagee3
- Direction
- increasede3
- Value
- 6%e3
- Comparator
- late falle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e3“Without the polymer seed coat, canola yield was reduced 42% and dockage increased 6% when seeding occurred in early vs. late fall”
Claim · model-written summary
Increased pod production from early-fall-seeded uncoated canola only partially compensated for the canola yield loss.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- early-fall-seeded uncoated canolae4
- Outcome
- pod productione4
- Direction
- Increasede4
- Comparator
- other seeding datese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e4“Increased pod production from early-fall-seeded uncoated canola compared to other seeding dates could only partially compensate for canola yield”
Claim · model-written summary
Cultivar interactions were generally not agronomically important.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- Cultivar interactionse5
- Qualifier
- not agronomically importante5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e5“Cultivar interactions generally were not agronomically important”
Claim · model-written summary
Polymer seed coatings allow producers to seed herbicide-tolerant canola earlier in fall.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- polymer seed coatingse6
- Outcome
- seed earlier in falle6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polymer seed coating of early- and late-fall-seeded herbicide-tolerant canola (Brassica napus L.) cultivars”
e6“The use of polymer seed coatings with all these herbicide-tolerant cultivars will allow producers to seed earlier in fall”
The same questions in other papers
seed treatment · yield · Brassica napus (oilseed rape)Results differ
1 paper in the same direction as this paper · 24 reporting no difference from an alternative
- positive
- positive
- positive
22 papers more in this group
See all 26 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.