Abstract
Using competitive crops and cultivars can be an important integrated weed management (IWM) tool, useful in both conventional and low-external-input (LEI) farming systems. Barley is considered a competitive crop, but cultivar competitiveness varies. There are two aspects of cultivar competitive ability; the ability to compete (AC) and the ability to withstand competition (AWC). However, the relationship between these aspects has not been addressed in barley. A study was conducted to explore aspects of barley cultivar competitive ability with oats, and to examine the feasibility of ranking cultivars based on either, or both, AWC and AC. Field trials were undertaken in 2001 and 2002 to determine cultivar competitive ability for 29 barley cultivars commonly grown on the Canadian prairies. Cultivars were selected from semidwarf and full height, hulled and hull-less, 2- and 6-row, and feed and malt classes. Yield loss ranged from 6 to 79% while weed seed return ranged from 10 to 83% of gross yield. As a class, semidwarf and hull-less cultivars were less competitive than full height and hulled cultivars, respectively. However, considerable variation existed within these classes, and an absolute relationship between class membership and competitive ability did not exist. Ability to withstand competition was significantly correlated with ability to compete, but correlation coefficients were not strong enough to attempt reliable co-selection within a breeding program. Ability to compete was a more consistent measure of competitive ability than AWC. Ranking barley cultivar competitive ability would make it a valuable IWM tool for farmers and extension personnel.
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Claims 9
Claim · model-written summary
Yield loss of the 29 barley cultivars under competition ranged from 6 to 79%.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Outcome
- Yield losse0
- Value
- 6 to 79%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Yield loss ranged from 6 to 79%”
t0“barley”
Claim · model-written summary
Weed seed return across the barley cultivars ranged from 10 to 83% of gross yield.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- weed seed returne0
- Value
- 10 to 83% of gross yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed seed return ranged from 10 to 83% of gross yield”
t0“barley”
Claim · model-written summary
Semidwarf barley cultivars were less competitive than full height cultivars as a class.
- Taxon
- barleyHordeum vulgaret0
- Material
- semidwarfe0
- Outcome
- competitivee0
- Direction
- less competitivee0
- Comparator
- full heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a class, semidwarf and hull-less cultivars were less competitive than full height and hulled cultivars, respectively”
t0“barley”
Claim · model-written summary
Hull-less barley cultivars were less competitive than hulled cultivars as a class.
- Taxon
- barleyHordeum vulgaret0
- Material
- hull-lesse0
- Outcome
- competitivee0
- Direction
- less competitivee0
- Comparator
- hullede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a class, semidwarf and hull-less cultivars were less competitive than full height and hulled cultivars, respectively”
t0“barley”
Claim · model-written summary
Considerable variation in competitive ability existed within cultivar classes, and no absolute relationship between class membership and competitive ability existed.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- considerable variation existed within these classese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“considerable variation existed within these classes, and an absolute relationship between class membership and competitive ability did not exist”
t0“barley”
Claim · model-written summary
Ability to withstand competition was significantly correlated with ability to compete.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- Ability to withstand competitione0
- Comparator
- ability to competee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ability to withstand competition was significantly correlated with ability to compete”
t0“barley”
Claim · model-written summary
Correlation coefficients between the two competitive measures were not strong enough to attempt reliable co-selection within a breeding program.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- correlation coefficients were not strong enough to attempt reliable co-selectione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“correlation coefficients were not strong enough to attempt reliable co-selection within a breeding program”
t0“barley”
Claim · model-written summary
Ability to compete was a more consistent measure of competitive ability than ability to withstand competition.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- more consistent measure of competitive abilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ability to compete was a more consistent measure of competitive ability than AWC”
t0“barley”
Claim · model-written summary
Ranking barley cultivar competitive ability would make it a valuable integrated weed management tool for farmers and extension personnel.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- valuable IWM toole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ranking barley cultivar competitive ability would make it a valuable IWM tool for farmers and extension personnel”