Abstract
Relationships between volunteer barley plant density and both pea and volunteer barley yield were determined in field experiments conducted over 2 yr at Vegreville and Lethbridge, Alberta. Nonlinear regression analysis indicated that severe pea yield losses due to volunteer barley occurred at both locations. Averaged over both years, pea seed yield losses per volunteer barley plant (initial slopes) varied from 1.7% at Vegreville to 5.4% at Lethbridge. Based on certain assumptions, economic thresholds calculated from the equations were approximately 2 and 6 volunteer barley plants m −2 at Lethbridge and Vegreville, respectively. Revenue from the volunteer barley seed partially alleviated the monetary losses caused by the reduced pea seed yield. The effects of pea density on pea and volunteer barley yield were inconsistent and marginal. This suggested that there was little advantage, in terms of increasing pea yield or reducing volunteer barley interference, to seeding pea above the recommended rate of 100 plants m −2 .
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Claims 7
Claim · model-written summary
Volunteer barley caused severe pea yield losses at both locations.
- Taxon
- pea
Lathyrus oleraceuse0 - Interactor
- volunteer barleye0weed
- Outcome
- pea yield lossese0
- Direction
- lossese0
- Setting
- both locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“severe pea yield losses due to volunteer barley occurred at both locations.”
Claim · model-written summary
Pea yield loss per volunteer barley plant was 1.7% at Vegreville.
- Taxon
- peaLathyrus oleraceuse0
- Interactor
- volunteer barleye0weed
- Outcome
- pea seed yield losses per volunteer barley plante0
- Direction
- lossese0
- Value
- 1.7%e0
- Setting
- Vegrevillee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea seed yield losses per volunteer barley plant (initial slopes) varied from 1.7% at Vegreville to 5.4% at Lethbridge.”
Claim · model-written summary
Pea yield loss per volunteer barley plant was 5.4% at Lethbridge.
- Taxon
- peaLathyrus oleraceuse0
- Interactor
- volunteer barleye0weed
- Outcome
- pea seed yield losses per volunteer barley plante0
- Direction
- lossese0
- Value
- 5.4%e0
- Setting
- Lethbridgee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea seed yield losses per volunteer barley plant (initial slopes) varied from 1.7% at Vegreville to 5.4% at Lethbridge.”
Claim · model-written summary
The calculated threshold was approximately two barley plants per square metre at Lethbridge.
- Taxon
- peaLathyrus oleraceust0
- Interactor
- volunteer barleye0weed
- Outcome
- economic thresholdse0
- Value
- 2 and 6 volunteer barley plants m −2e0
- Setting
- Lethbridgee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“economic thresholds calculated from the equations were approximately 2 and 6 volunteer barley plants m −2 at Lethbridge and Vegreville, respectively.”
t0“field pea”
Claim · model-written summary
Volunteer barley seed revenue partly offset monetary losses from reduced pea yield.
- Taxon
- peaLathyrus oleraceuse0
- Interactor
- volunteer barleye0weed
- Outcome
- monetary losses caused by the reduced pea seed yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Revenue from the volunteer barley seed partially alleviated the monetary losses caused by the reduced pea seed yield.”
Claim · model-written summary
Pea density effects on pea and volunteer barley yields were inconsistent and marginal.
- Taxon
- peaLathyrus oleraceuse0
- Interactor
- volunteer barleye0weed
- Outcome
- pea and volunteer barley yielde0
- Direction
- inconsistent and marginale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of pea density on pea and volunteer barley yield were inconsistent and marginal.”
Claim · model-written summary
The authors found little advantage to sowing pea above 100 plants per square metre.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- seeding pea above the recommended rate of 100 plants m −2e0
- Interactor
- volunteer barleye0weed
- Outcome
- little advantagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was little advantage, in terms of increasing pea yield or reducing volunteer barley interference, to seeding pea above the recommended rate of 100 plants m −2”