Abstract
ABSTRACT Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production. In 1997/98 eight cultivars were tested under three seeding rates (90, 120 and 150 seeds m−2). The dry weight (DW) of the natural weed population at harvest was used to measure competitive ability. In 2000, ten cultivars were tested with one seeding rate (110 seeds m−2) and DW of an in-sown weed crop of winter rape (Brassica napus) plants was used to measure competitive ability. The competitive ability of the pea crop increased significantly when the seeding rate was increased from 90 to 150 seeds m−2 in both years. The reduction in weed DW due to increased seeding rate in 1997 and 1998 was 50% and 30%, respectively, but the increase in yield of peas was only significant in one year. There were significant differences between competitive ability of cultivars in both experiments. Cultivars with high seed weight and with fast early growth tended to be more competitive than small sized peas and slower growing peas. Correlations for seed weight were significant in both years when certain plant types were excluded, but correlations for fast early growth were only significant in one year out of two. Cultivars with high biomass accumulation like Ambassador, Greenshaft, Jaguar, Zelda and DS8903 were highly competitive while the small sized pea cultivars like Dinos, Argona and Wizard were found to have low competitive ability and were therefore unsuitable for organic pea production. The expected lower competitive ability of semi-leafless plant types compared with normal leafed could not be verified in the present work, but needs further studies with near-related genotypes that differ only in leaf type.
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Claims 12
Claim · model-written summary
Increasing the seeding rate from 90 to 150 seeds m−2 significantly increased the competitive ability of pea in both years.
- Taxon
- Pisum sativum
Lathyrus oleraceuse1 - Treatment
- seeding rate was increased from 90 to 150 seeds m−2e2
- Interactor
- weedse1weed
- Outcome
- competitive abilitye2
- Direction
- increasede2
- Qualifier
- in both yearse2
- Comparator
- from 90e2
- Setting
- Field experimentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e2“The competitive ability of the pea crop increased significantly when the seeding rate was increased from 90 to 150 seeds m−2 in both years”
Claim · model-written summary
Increased seeding rate reduced weed dry weight by 50% in 1997.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- increased seeding ratee3
- Interactor
- weede3weed
- Outcome
- weed DWe3
- Direction
- reductione3
- Value
- 50%e3
- Setting
- 1997e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e3“The reduction in weed DW due to increased seeding rate in 1997 and 1998 was 50% and 30%, respectively, but the increase in yield of peas was only significant in one year”
Claim · model-written summary
Increased seeding rate reduced weed dry weight by 30% in 1998.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- increased seeding ratee3
- Interactor
- weede3weed
- Outcome
- weed DWe3
- Direction
- reductione3
- Value
- 30%e3
- Setting
- 1998e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e3“The reduction in weed DW due to increased seeding rate in 1997 and 1998 was 50% and 30%, respectively, but the increase in yield of peas was only significant in one year”
Claim · model-written summary
The increase in pea yield with higher seeding rate was significant in only one year.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- increased seeding ratee3
- Outcome
- yield of pease3
- Direction
- increasee3
- Qualifier
- only significant in one yeare3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e3“The reduction in weed DW due to increased seeding rate in 1997 and 1998 was 50% and 30%, respectively, but the increase in yield of peas was only significant in one year”
Claim · model-written summary
Cultivars with high seed weight and fast early growth tended to be more competitive than small sized and slower growing peas.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- competitivee4
- Direction
- higherinferrede4
- Qualifier
- with high seed weight and with fast early growthe4
- Comparator
- small sized peas and slower growing pease4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e4“Cultivars with high seed weight and with fast early growth tended to be more competitive than small sized peas and slower growing peas”
Claim · model-written summary
Correlations for seed weight with competitive ability were significant in both years when certain plant types were excluded.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- seed weighte5
- Qualifier
- when certain plant types were excludede5
- Setting
- both yearse5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e5“Correlations for seed weight were significant in both years when certain plant types were excluded”
Claim · model-written summary
Correlations for fast early growth with competitive ability were significant in only one year out of two.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- fast early growthe6
- Setting
- one year out of twoe6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e6“correlations for fast early growth were only significant in one year out of two”
Claim · model-written summary
The expected lower competitive ability of semi-leafless pea types compared with normal leafed types could not be verified.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Material
- semi-leafless plant typese7
- Outcome
- competitive abilitye7
- Qualifier
- could not be verified in the present worke7
- Comparator
- normal leafede7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e7“The expected lower competitive ability of semi-leafless plant types compared with normal leafed could not be verified in the present work”
Claim · model-written summary
Cultivars with high biomass accumulation such as Ambassador, Greenshaft, Jaguar, Zelda and DS8903 were highly competitive.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Material
- Ambassador, Greenshaft, Jaguar, Zelda and DS8903e0
- Outcome
- highly competitivee0
- Qualifier
- high biomass accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e0“Cultivars with high biomass accumulation like Ambassador, Greenshaft, Jaguar, Zelda and DS8903 were highly competitive”
Claim · model-written summary
Small sized pea cultivars Dinos, Argona and Wizard had low competitive ability.
- Taxon
- peaLathyrus oleraceuse0
- Material
- Dinos, Argona and Wizarde0
- Outcome
- competitive abilitye0
- Qualifier
- small sizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small sized pea cultivars like Dinos, Argona and Wizard were found to have low competitive ability”
Claim · model-written summary
Small sized pea cultivars are unsuitable for organic pea production.
- Taxon
- peaLathyrus oleraceuse0
- Outcome
- unsuitable for organic pea productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were therefore unsuitable for organic pea production”
Claim · model-written summary
Cultivars differed significantly in competitive ability in both experiments.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- competitive ability of cultivarse2
- Setting
- both experimentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Field experiments were conducted in 1997,1998 and 2000 to investigate the effects of genotype and seeding rate on the competitive ability of green pea (Pisum sativum L.) crops against weeds in organic production”
e2“There were significant differences between competitive ability of cultivars in both experiments”
The same questions in other papers
density · growth · Lathyrus oleraceus (pea)Positive and negative results
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See all 11 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.