Abstract
The impacts of weed interference on hemp ( Cannabis sativa ) yield are largely unstudied despite causing serious economic losses in most cropping systems. For high-cannabidiol (CBD) hemp, understanding the role of weed competition on CBD and tetrahydrocannabinol (THC) content may help promote profitability and regulatory compliance. Therefore, we tested the effects of varying waterhemp [ Amaranthus tuberculatus (zero, one, three, and five waterhemp plants per planting hole)] and hemp (zero or one hemp plants per planting hole) planting densities on total hemp yield, chemical composition, and aboveground waterhemp biomass in plasticulture. There was no significant total biomass or stripped floral biomass yield loss resulting from waterhemp competition, although unexpectedly high variation in hemp phenotypes likely limited the ability to detect subtle differences between treatments. Furthermore, there was no significant effect of competition treatment on total CBD, total THC, or measured terpene composition. However, waterhemp biomass was reduced significantly by competition from hemp in comparison with hemp-free treatments. Suppression of waterhemp by hemp and lack of significant yield loss suggest that hemp can be highly competitive and grown successfully without herbicides in certain circumstances.
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Claims 4
Claim · model-written summary
Waterhemp competition caused no significant loss of total or stripped floral biomass yield in hemp.
- Taxon
- hemp
Cannabis sativa subsp. sativae0 - Treatment
- waterhemp competitione2
- Interactor
- Amaranthus tuberculatus
.jpeg?width=60)
Amaranthus tuberculatuse1weed - Outcome
- total biomass or stripped floral biomass yield losse2
- Direction
- no_changeinferrede2
- Qualifier
- unexpectedly high variation in hemp phenotypes likely limited the ability to detect subtle differencese2
- Comparator
- zeroe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpeg?width=500)
Verbatim
e0“The impacts of weed interference on hemp ( Cannabis sativa ) yield”
e1“waterhemp [ Amaranthus tuberculatus (zero, one, three, and five waterhemp plants per planting hole)]”
e2“There was no significant total biomass or stripped floral biomass yield loss resulting from waterhemp competition, although unexpectedly high variation in hemp phenotypes likely limited the ability to detect subtle differences between treatments”
Claim · model-written summary
Waterhemp competition had no significant effect on total CBD, total THC or measured terpene composition of hemp.
- Taxon
- hempCannabis sativa subsp. sativae0
- Treatment
- competition treatmente3
- Interactor
- Amaranthus tuberculatusAmaranthus tuberculatuse1weed
- Outcome
- total CBD, total THC, or measured terpene compositione3
- Direction
- no_changeinferrede3
- Comparator
- zeroe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impacts of weed interference on hemp ( Cannabis sativa ) yield”
e1“waterhemp [ Amaranthus tuberculatus (zero, one, three, and five waterhemp plants per planting hole)]”
e3“Furthermore, there was no significant effect of competition treatment on total CBD, total THC, or measured terpene composition”
Claim · model-written summary
Hemp competition significantly reduced waterhemp biomass compared with hemp-free treatments.
- Taxon
- hempCannabis sativa subsp. sativae0
- Treatment
- competition from hempe4
- Interactor
- waterhempe4weed
- Outcome
- waterhemp biomasse4
- Direction
- reducede4
- Comparator
- hemp-free treatmentse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impacts of weed interference on hemp ( Cannabis sativa ) yield”
e4“waterhemp biomass was reduced significantly by competition from hemp in comparison with hemp-free treatments”
Claim · model-written summary
Hemp can be highly competitive and grown successfully without herbicides in certain circumstances.
- Taxon
- hempCannabis sativa subsp. sativae0
- Interactor
- waterhempe5weed
- Outcome
- grown successfully without herbicidese5
- Qualifier
- in certain circumstancese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impacts of weed interference on hemp ( Cannabis sativa ) yield”
e5“Suppression of waterhemp by hemp and lack of significant yield loss suggest that hemp can be highly competitive and grown successfully without herbicides in certain circumstances”
The same questions in other papers
Cannabis sativa subsp. sativa · growth · Cannabis sativaResults agree
2 papers in the same direction as this paper
- positive
- positive
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.