Abstract
Low inputs in nitrogen may affect canola ( Brassica napus L.) competitiveness and allelopathic potential as well as grain and oil yields. A 2‐yr study was conducted to assess nitrogen supply effect on the ability of four canola hybrids to compete with corn poppy ( Papaver rhoeas L.) as well as its effect on canola seed and oil yields. Phytotoxic potential of canola hybrids on germination and growth of winter wild oat ( Avena sterilis spp. ludoviciana L.), corn poppy, and wild mustard ( Sinapis arvensis L.) was also determined using a perlite‐based bioassay. At canola blossom, corn poppy plant number in nitrogen‐treated plots was 23% less than that in the nitrogen‐untreated ones. Canola seed and oil yield was reduced 18.6 and 23.7%, respectively, by the competition of 100 corn poppy plants m −2 , with ‘Elan’ and ‘Titan’ the most productive hybrids. Nitrogen supply did not increase in all cases the competitive ability or the seed and oil yields. In the laboratory, germination of the winter weeds was completely inhibited by the greatest extract concentration (5 g 100 mL −1 ) of all hybrids. Nitrogen supply did not affect, in most cases, the phytotoxicity of canola hybrids, while phytotoxicity did not significantly differ among hybrids. Conclusively, the hybrids Elan and Titan, cultivated without any herbicide or nitrogen fertilizer, could be viable as a short‐term alternative crop system for canola seed and oil production, especially in organic or low‐input fields infested by corn poppy.
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Claims 9
Claim · model-written summary
Nitrogen-treated plots had 23% fewer corn poppy plants than untreated plots at canola blossom.
- Treatment
- nitrogen‐treated plotse0
- Interactor
- corn poppy
Papaver rhoease0weed - Outcome
- corn poppy plant numbere0
- Direction
- lesse0
- Value
- 23%e0
- Comparator
- nitrogen‐untreated onese0
Not reportedTaxon
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At canola blossom, corn poppy plant number in nitrogen‐treated plots was 23% less than that in the nitrogen‐untreated ones”
Claim · model-written summary
Competition from corn poppy reduced canola seed yield 18.6%.
- Taxon
- Canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- competition of 100 corn poppy plants m −2e0
- Interactor
- corn poppyPapaver rhoease0weed
- Outcome
- seede0
- Direction
- reducede0
- Value
- 18.6e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Canola seed and oil yield was reduced 18.6 and 23.7%, respectively, by the competition of 100 corn poppy plants m −2”
Claim · model-written summary
Competition from corn poppy reduced canola oil yield 23.7%.
- Taxon
- CanolaBrassica napus var. napuse0
- Treatment
- competition of 100 corn poppy plants m −2e0
- Interactor
- corn poppyPapaver rhoease0weed
- Outcome
- oil yielde0
- Direction
- reducede0
- Value
- 23.7%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola seed and oil yield was reduced 18.6 and 23.7%, respectively, by the competition of 100 corn poppy plants m −2”
Claim · model-written summary
Elan and Titan were the most productive canola hybrids.
Not reportedTaxon
Verbatim
e0“with ‘Elan’ and ‘Titan’ the most productive hybrids”
Claim · model-written summary
Nitrogen supply did not consistently increase canola competitive ability or seed and oil yields.
- Treatment
- Nitrogen supplye0
- Outcome
- competitive ability or the seed and oil yieldse0
- Direction
- did not increase in all casese0
Not reportedTaxonComparator
Verbatim
e0“Nitrogen supply did not increase in all cases the competitive ability or the seed and oil yields”
Claim · model-written summary
The greatest canola extract concentration completely inhibited winter weed germination.
- Treatment
- greatest extract concentration (5 g 100 mL −1 )e0
- Interactor
- winter weedse0weed
- Outcome
- germination of the winter weedse0
- Direction
- completely inhibitede0
Not reportedTaxonComparator
Verbatim
e0“germination of the winter weeds was completely inhibited by the greatest extract concentration (5 g 100 mL −1 ) of all hybrids”
Claim · model-written summary
Nitrogen supply usually did not affect canola hybrid phytotoxicity.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Nitrogen supplye0
- Outcome
- phytotoxicity of canola hybridse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen supply did not affect, in most cases, the phytotoxicity of canola hybrids”
Claim · model-written summary
Canola hybrid phytotoxicity did not significantly differ among hybrids.
Not reportedTaxon
Verbatim
e0“phytotoxicity did not significantly differ among hybrids”
Claim · model-written summary
The authors propose Elan and Titan without herbicide or nitrogen fertilizer as a short-term canola production system in low-input poppy-infested fields.
- Taxon
- canolaBrassica napus var. napuse0
- Material
- Elan and Titane0
- Outcome
- short‐term alternative crop systeme0
- Qualifier
- organic or low‐input fields infested by corn poppye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hybrids Elan and Titan, cultivated without any herbicide or nitrogen fertilizer, could be viable as a short‐term alternative crop system for canola seed and oil production, especially in organic or low‐input fields infested by corn poppy”
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See all 11 papers →nitrogen · crop injury · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- negative
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.