Abstract
Stems of Chenopodium album . and Sinapis arvensis . and leaves of Lolium perenne . were cut with a CO 2 laser or with a pair of scissors. Treatments were carried out on greenhouse‐grown pot plants at three different growth stages and at two heights. Plant dry matter was measured 2 to 5 weeks after treatment. The relationship between dry weight and laser energy was analysed using a non‐linear dose–response regression model. The regression parameters differed significantly between the weed species. At all growth stages and heights S. arvensis was more difficult to cut with a CO 2 laser than C. album . When stems were cut below the meristems, 0.9 and 2.3 J mm −1 of CO 2 laser energy dose was sufficient to reduce by 90% the biomass of C. album and S. arvensis respectively. Regrowth appeared when dicotyledonous plant stems were cut above meristems, indicating that it is important to cut close to the soil surface to obtain a significant effect. When cutting L. perenne plants with 2‐true leaves at a height of 2 cm from the soil surface with a laser, the biomass decreased significantly compared with plants cut by scissors, indicating a delay in regrowth. This delay was not observed for the dicotyledonous plants nor for the other growth stages of L. perenne .
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Claims 8
Claim · model-written summary
Dose response regression parameters differed by weed species.
Verbatim
e0“The regression parameters differed significantly between the weed species”
Claim · model-written summary
S. arvensis was more difficult to cut than C. album at every stage and height.
- Taxon
- S. arvensis
Mutarda arvensise0 - Treatment
- CO 2 lasere0
- Outcome
- more difficult to cute0
- Direction
- more difficulte0
- Comparator
- C. albume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all growth stages and heights S. arvensis was more difficult to cut with a CO 2 laser than C. album”
Claim · model-written summary
A 0.9 J mm −1 laser dose cut C. album biomass by 90% below the meristems.
- Taxon
- C. album
Chenopodium albume0 - Treatment
- CO 2 laser energy dosee0
- Outcome
- biomasse0
- Direction
- reducee0
- Value
- 90%e0
- Qualifier
- below the meristemse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When stems were cut below the meristems, 0.9 and 2.3 J mm −1 of CO 2 laser energy dose was sufficient to reduce by 90% the biomass of C. album and S. arvensis respectively”
Claim · model-written summary
A 2.3 J mm −1 laser dose cut S. arvensis biomass by 90% below the meristems.
- Taxon
- S. arvensisMutarda arvensise0
- Treatment
- 2.3 J mm −1 of CO 2 laser energy dosee0
- Outcome
- biomasse0
- Direction
- reducee0
- Value
- 90%e0
- Qualifier
- below the meristemse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When stems were cut below the meristems, 0.9 and 2.3 J mm −1 of CO 2 laser energy dose was sufficient to reduce by 90% the biomass of C. album and S. arvensis respectively”
Claim · model-written summary
Dicot stems regrew when cut above meristems.
Not reportedDirection
Verbatim
e0“Regrowth appeared when dicotyledonous plant stems were cut above meristems”
Claim · model-written summary
Laser cutting L. perenne at the two-leaf stage and 2 cm height reduced biomass relative to scissors.
- Taxon
- L. perenne
Lolium perennee0 - Organ / stage
- 2‐true leavese0
- Treatment
- lasere0
- Outcome
- biomasse0
- Direction
- decreasede0
- Qualifier
- 2 cm from the soil surfacee0
- Comparator
- plants cut by scissorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When cutting L. perenne plants with 2‐true leaves at a height of 2 cm from the soil surface with a laser, the biomass decreased significantly compared with plants cut by scissors”
Claim · model-written summary
The regrowth delay did not occur in dicotyledonous plants.
Not reportedDirection
Verbatim
e0“This delay was not observed for the dicotyledonous plants nor for the other growth stages of L. perenne”
Claim · model-written summary
The regrowth delay did not occur at other L. perenne growth stages.
- Taxon
- L. perenneLolium perennee0
- Organ / stage
- other growth stagese0
- Outcome
- delaye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This delay was not observed for the dicotyledonous plants nor for the other growth stages of L. perenne”
The same questions in other papers
co2 · growth · Chenopodium album (common lambsquarters)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 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.