Abstract
Seed crops of white clover (Trifolium repens L.) are usually established with a cover crop. Provided sufficient light, white clover may compensate for low plant density by stoloniferous growth. Our objectives were (1) to compare spring barley or spring wheat used as cover crops for white clover and (2) to find the optimal seeding rate/row distance for white clover. Seven field trials were conducted in Southeast Norway from 2000 to 2003. Barley was seeded at 360 and 240 seeds m−2 and wheat at 525 and 350 seeds m−2. White clover was seeded perpendicularly to the cover crop at 400 seeds m−2/13 cm row distance or 200 seeds m−2/26 cm. Results showed that light penetration in spring and early summer was better in wheat than in barley. On average for seven trials, this resulted in 11% higher seed yield after establishment in wheat than in barley. The 33% reduction in cover crop seeding rate had no effect on white clover seed yield for any of the cover crops. Reducing the seeding rate/doubling the row distance of white clover had no effect on seed yield but resulted in slightly earlier maturation of the seed crop.
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Claims 5
Claim · model-written summary
Light penetration in spring and early summer was better under spring wheat than under spring barley as cover crop.
- Taxon
- white clover
Trifolium repense0 - Treatment
- spring wheate0
- Outcome
- light penetratione1
- Direction
- bettere1
- Comparator
- spring barleye0
- Setting
- Southeast Norwaye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compare spring barley or spring wheat used as cover crops for white clover”
e1“light penetration in spring and early summer was better in wheat than in barley”
e2“Seven field trials were conducted in Southeast Norway from 2000 to 2003”
Claim · model-written summary
White clover seed yield was 11% higher after establishment under spring wheat than under spring barley cover.
- Taxon
- white cloverTrifolium repense0
- Treatment
- spring wheate0
- Outcome
- seed yielde3
- Direction
- highere3
- Value
- 11%e3
- Comparator
- spring barleye0
- Setting
- Southeast Norwaye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compare spring barley or spring wheat used as cover crops for white clover”
e2“Seven field trials were conducted in Southeast Norway from 2000 to 2003”
e3“this resulted in 11% higher seed yield after establishment in wheat than in barley”
Claim · model-written summary
A 33% reduction in cover crop seeding rate had no effect on white clover seed yield for any of the cover crops.
- Taxon
- white cloverTrifolium repense4
- Treatment
- 33% reduction in cover crop seeding ratee4
- Outcome
- seed yielde4
- Direction
- no effecte4
- Setting
- Southeast Norwaye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Seven field trials were conducted in Southeast Norway from 2000 to 2003”
e4“The 33% reduction in cover crop seeding rate had no effect on white clover seed yield for any of the cover crops”
Claim · model-written summary
Reducing the seeding rate or doubling the row distance of white clover had no effect on seed yield.
- Taxon
- white cloverTrifolium repense5
- Treatment
- Reducing the seeding rate/doubling the row distancee5
- Outcome
- seed yielde5
- Direction
- no effecte5
- Setting
- Southeast Norwaye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Seven field trials were conducted in Southeast Norway from 2000 to 2003”
e5“Reducing the seeding rate/doubling the row distance of white clover had no effect on seed yield”
Claim · model-written summary
Reducing the seeding rate or doubling the row distance of white clover slightly advanced seed crop maturation.
- Taxon
- white cloverTrifolium repense5
- Treatment
- Reducing the seeding rate/doubling the row distancee5
- Outcome
- maturatione6
- Direction
- earliere6
- Qualifier
- slightlye6
- Setting
- Southeast Norwaye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Seven field trials were conducted in Southeast Norway from 2000 to 2003”
e5“Reducing the seeding rate/doubling the row distance of white clover had no effect on seed yield”
e6“but resulted in slightly earlier maturation of the seed crop”
The same questions in other papers
density · yield · Trifolium repens (white clover)Positive and negative results
5 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- no effect
- positive
6 papers more in this group
See all 10 papers →cover crop · yield · Trifolium repens (white clover)Results agree
1 paper in the same direction as this paper
- no effect
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.