Abstract
Evolved resistance to herbicides necessitates alternative weed control strategies. Allelopathic crops show promise as an alternative to exogenous herbicides and could be used to reduce establishment, growth, and reproduction of weeds. Individual cannabinoids and terpenes found in hemp ( Cannabis sativa L.) show allelopathic potential, but allelopathic effects of plant residue have not been characterized. A laboratory assay found that crude, acetone-soluble hemp extracts diluted to 2.5 mg mL −1 reduced the germination of a bioindicator species. However, tested concentrations below 2.5 mg mL −1 were not more effective than the no-extract control treatment at reducing germination. A greenhouse study found that soil-incorporated hemp residue was not more effective than a maize ( Zea mays L.) residue treatment comparison in reducing plant growth. However, a simulated chaff line experiment in the greenhouse showed that the equivalent of 378 g m −2 hemp residue on the soil surface can effectively reduce and delay the germination of waterhemp [ Amaranthus tuberculatus (Moq.) Sauer] in comparison to bare-soil, or a maize residue treatment comparison. Together, these results show that incorporated hemp residue will likely not be an effective weed control practice. However, chaff lining hemp residue may be an effective practice for the control of certain weeds and warrants further research in a field setting.
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Claims 6
Claim · model-written summary
Crude hemp extracts at 2.5 mg mL-1 reduced germination of a bioindicator species in a laboratory assay.
- Taxon
- hemp
Cannabis sativa subsp. sativae1 - Treatment
- crude, acetone-soluble hemp extracts diluted to 2.5 mg mL −1e2
- Outcome
- germinatione2
- Direction
- reducede2
- Comparator
- no-extract control treatmente3
- Setting
- laboratorye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Individual cannabinoids and terpenes found in hemp ( Cannabis sativa L.) show allelopathic potential”
e2“A laboratory assay found that crude, acetone-soluble hemp extracts diluted to 2.5 mg mL −1 reduced the germination of a bioindicator species”
e3“However, tested concentrations below 2.5 mg mL −1 were not more effective than the no-extract control treatment at reducing germination”
Claim · model-written summary
Hemp extract concentrations below 2.5 mg mL-1 were not more effective than the no-extract control at reducing germination.
- Taxon
- hempCannabis sativa subsp. sativae1
- Treatment
- tested concentrations below 2.5 mg mL −1e3
- Outcome
- germinatione3
- Direction
- not more effectivee3
- Comparator
- no-extract control treatmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Individual cannabinoids and terpenes found in hemp ( Cannabis sativa L.) show allelopathic potential”
e3“However, tested concentrations below 2.5 mg mL −1 were not more effective than the no-extract control treatment at reducing germination”
Claim · model-written summary
Soil-incorporated hemp residue was not more effective than maize residue at reducing plant growth in a greenhouse.
- Taxon
- hempCannabis sativa subsp. sativae1
- Treatment
- soil-incorporated hemp residuee4
- Outcome
- plant growthe4
- Direction
- not more effectivee4
- Comparator
- maize ( Zea mays L.) residuee4
- Setting
- greenhousee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Individual cannabinoids and terpenes found in hemp ( Cannabis sativa L.) show allelopathic potential”
e4“A greenhouse study found that soil-incorporated hemp residue was not more effective than a maize ( Zea mays L.) residue treatment comparison in reducing plant growth”
Claim · model-written summary
A simulated chaff line of 378 g m-2 hemp residue reduced and delayed germination of waterhemp in the greenhouse compared with bare soil.
- Taxon
- hempCannabis sativa subsp. sativae1
- Treatment
- 378 g m −2 hemp residue on the soil surfacee5
- Interactor
- waterhempe5weed
- Outcome
- germinatione5
- Direction
- reduce and delaye5
- Comparator
- bare-soile5
- Setting
- greenhousee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Individual cannabinoids and terpenes found in hemp ( Cannabis sativa L.) show allelopathic potential”
e5“a simulated chaff line experiment in the greenhouse showed that the equivalent of 378 g m −2 hemp residue on the soil surface can effectively reduce and delay the germination of waterhemp [ Amaranthus tuberculatus (Moq.) Sauer] in comparison to bare-soil, or a maize residue treatment comparison”
Claim · model-written summary
Chaff lining hemp residue may be an effective practice for controlling certain weeds and warrants further field research.
- Taxon
- hempCannabis sativa subsp. sativae7
- Outcome
- control of certain weedse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“chaff lining hemp residue may be an effective practice for the control of certain weeds”
Claim · model-written summary
Incorporated hemp residue will likely not be an effective weed control practice.
- Taxon
- hempCannabis sativa subsp. sativae6
- Outcome
- effective weed control practicee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Together, these results show that incorporated hemp residue will likely not be an effective weed control practice”
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
botanical · 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.