Abstract
The framework conditions for chemical weed control in oilseed rape (OSR) are becoming increasingly unfavorable in Central Europe. On the one hand, weed resistance is spreading and, on the other, there is a growing social desire to reduce or eliminate the use of chemical crop protection products. In a field experiment, hoeing, as a weed control measure performed two times per growing season (one time in autumn and one time in spring) in oilseed rape (Brassica napus; two varieties), was compared to chemical control by herbicides and a combination of hoeing and herbicide application (five treatments altogether). The chemical control by herbicides consisted of a broad-spectrum pre-emergence treatment and a post-emergence graminicide application. The trial was set up in each of three periods (years 2014/2015, 2015/2016, and 2016/2017) at the experimental station Ihinger Hof, University of Hohenheim, Stuttgart, Germany. The effect of the treatments on weed plant density, weed biomass at the time of harvesting, and on OSR grain yield was investigated. Weed plant density was measured four times per trial year, each time before and after hoeing. In 2015/2016 after spring hoeing, and in 2016/2017 at all data collection times, weed plant density was significantly higher in hoeing without herbicide application than in the other variants. No significant differences occurred at the other data collection times. The weed plant density ranged from 0.5 to 57.8 plants m−2. Regardless of the trial year, pure hoeing always resulted in a significantly higher weed biomass at the time of harvesting than the herbicide applications or the combinations. The weed biomass at the time of harvesting ranged between 0.1 and 54.7 g m−2. No significant differences in grain yield between hoeing and herbicide application occurred in all three trial years. According to the results, hoeing is a suitable extension of existing integrated weed control strategies in OSR.
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Claims 7
Claim · model-written summary
Hoeing without herbicide had significantly higher weed density than other variants at specified times.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- hoeing without herbicide applicatione0
- Outcome
- weed plant densitye0
- Direction
- highere0
- Qualifier
- In 2015/2016 after spring hoeing, and in 2016/2017 at all data collection timese0
- Comparator
- other variantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“In 2015/2016 after spring hoeing, and in 2016/2017 at all data collection times, weed plant density was significantly higher in hoeing without herbicide application than in the other variants.”
t0“Oilseed Rape”
Claim · model-written summary
Weed density did not differ significantly at other collection times.
Not reportedTaxonTreatmentComparator
Verbatim
e0“No significant differences occurred at the other data collection times.”
Claim · model-written summary
Weed density ranged from 0.5 to 57.8 plants m−2.
Not reportedTaxon
Verbatim
e0“The weed plant density ranged from 0.5 to 57.8 plants m−2.”
Claim · model-written summary
Pure hoeing produced higher weed biomass than herbicide applications or combinations in every trial year.
- Treatment
- pure hoeinge0
- Outcome
- weed biomasse0
- Direction
- highere0
- Qualifier
- Regardless of the trial yeare0
- Comparator
- the herbicide applications or the combinationse0
Not reportedTaxon
Verbatim
e0“Regardless of the trial year, pure hoeing always resulted in a significantly higher weed biomass at the time of harvesting than the herbicide applications or the combinations.”
Claim · model-written summary
Harvest weed biomass ranged from 0.1 to 54.7 g m−2.
Not reportedTaxon
Verbatim
e0“The weed biomass at the time of harvesting ranged between 0.1 and 54.7 g m−2.”
Claim · model-written summary
Grain yield did not differ significantly between hoeing and herbicide application over three years.
- Treatment
- hoeinge0
- Outcome
- grain yielde0
- Direction
- No significant differencese0
- Qualifier
- all three trial yearse0
- Comparator
- herbicide applicatione0
Not reportedTaxon
Verbatim
e0“No significant differences in grain yield between hoeing and herbicide application occurred in all three trial years.”
Claim · model-written summary
The authors recommend hoeing as an extension of integrated weed control in oilseed rape.
Verbatim
e0“According to the results, hoeing is a suitable extension of existing integrated weed control strategies in OSR.”
The same questions in other papers
herbicide · weed · Brassica napus (oilseed rape)Positive and negative results
2 papers in the same direction as this paper · 23 in the opposite direction
- positive
- positive
- positive
22 papers more in this group
See all 26 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.