Abstract
Summary. One way to increase the competitiveness of crop pl ants against weed infestation is to adjust crop density. Introduction of new (“semi-dwa rf”) cultivars of winter oilseed rape triggers a need for research in this field. A two-factor exper iment evaluated the effect of plant density and winter oilseed rape (WOSR) cultivars on the canopy architecture and weed infestation of a WOSR crop as well as on the correlation between these tr aits. During the 2010 ‐2012 study period, the average plant density was 38.0; 29.4; and 22.9 plan ts m -2 (three row spacings were used: 33, 44, and 55 cm). The oilseed rape cultivars were as foll ows: conventional, hybrid and “semi-dwarf” hybrid. Experimental factors did not cause signific ant differences in the number of weeds and their mass. However, there was a clear trend of decreasin g total number of weeds in the span of 33 cm spacing than in the 44 and 55 cm. Hybrid cultivar r esulted in increasing of total number of weeds in comparison to the conventional one. The differen ces in the assimilation area of WOSR plants per unit of ground area were significant between ro w spacings until the end of the flowering stage and between cultivars until the flower bud development stage. During the growth stages from the beginning of flowering until the end of pod develop ment significant negative correlations were found between the assimilation area and the number of weeds, while the correlations between the assimilation area and the weed weight were insignif icant. Insignificant correlations also occurred between the number of oilseed rape plants per unit area and the mass of weeds. The results indicate the possibility of reducing the demand for see d sowing, without requiring additional costs for weed control.
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Claims 9
Claim · model-written summary
Experimental factors did not significantly alter weed number or mass.
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- Experimental factorse0
- Interactor
- weedse0weed
- Outcome
- number of weeds and their masse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Experimental factors did not cause signific ant differences in the number of weeds and their mass.”
t0“winter oilseed rape”
Claim · model-written summary
Weed number tended to decrease at 33 cm spacing relative to 44 and 55 cm.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- 33 cm spacinge0
- Interactor
- weedse0weed
- Outcome
- total number of weedse0
- Direction
- decreasin ge0
- Qualifier
- clear trende0
- Comparator
- 44 and 55 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, there was a clear trend of decreasin g total number of weeds in the span of 33 cm spacing than in the 44 and 55 cm.”
t0“winter oilseed rape”
Claim · model-written summary
The hybrid cultivar increased weed number compared with the conventional cultivar.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- Hybrid cultivare0
- Interactor
- weedse0weed
- Outcome
- total number of weedse0
- Direction
- increasinge0
- Comparator
- conventionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid cultivar r esulted in increasing of total number of weeds in comparison to the conventional one.”
t0“winter oilseed rape”
Claim · model-written summary
Row spacing significantly affected assimilation area until the end of flowering.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- ro w spacingse0
- Outcome
- assimilation area of WOSR plants per unit of ground areae0
- Qualifier
- until the end of the flowering stagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differen ces in the assimilation area of WOSR plants per unit of ground area were significant between ro w spacings until the end of the flowering stage and between cultivars until the flower bud development stage.”
t0“winter oilseed rape”
Claim · model-written summary
Cultivars differed significantly in assimilation area until flower bud development.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- cultivarse0
- Outcome
- assimilation area of WOSR plants per unit of ground areae0
- Qualifier
- until the flower bud development stagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differen ces in the assimilation area of WOSR plants per unit of ground area were significant between ro w spacings until the end of the flowering stage and between cultivars until the flower bud development stage.”
t0“winter oilseed rape”
Claim · model-written summary
Assimilation area was significantly negatively correlated with weed number from flowering onset to the end of pod development.
- Taxon
- winter oilseed rapeBrassica napust0
- Interactor
- weedse0weed
- Outcome
- number of weedse0
- Direction
- negativee0
- Qualifier
- from the beginning of flowering until the end of pod develop mente0
- Comparator
- assimilation areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the growth stages from the beginning of flowering until the end of pod develop ment significant negative correlations were found between the assimilation area and the number of weeds”
t0“winter oilseed rape”
Claim · model-written summary
Assimilation area and weed weight were not significantly correlated.
- Taxon
- winter oilseed rapeBrassica napust0
- Interactor
- weede0weed
- Outcome
- weed weighte0
- Comparator
- assimilation areae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the correlations between the assimilation area and the weed weight were insignif icant.”
t0“winter oilseed rape”
Claim · model-written summary
Oilseed rape density and weed mass were not significantly correlated.
- Taxon
- oilseed rapeBrassica napuse0
- Interactor
- weedse0weed
- Outcome
- mass of weedse0
- Comparator
- number of oilseed rape plants per unit areae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Insignificant correlations also occurred between the number of oilseed rape plants per unit area and the mass of weeds.”
Claim · model-written summary
The authors suggest seed sowing demand can be reduced without added weed control costs.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- reducing the demand for see d sowinge0
- Qualifier
- without requiring additional costs for weed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate the possibility of reducing the demand for see d sowing, without requiring additional costs for weed control.”
t0“winter oilseed rape”
The same questions in other papers
density · weed · Brassica napus (oilseed rape)Positive and negative results
4 papers in the same direction as this paper · 2 reporting no difference from an alternative
- no effect
- no effect
- positive
3 papers more in this group
See all 7 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.