Abstract
Precise crop fertilization requires an in-depth understanding of plant uptake and utilisation to optimise sustainable production. This study investigated the influence of nitrogen (N) nutrition and pruning on the cannabinoid concentrations and biomass of a commercial cannabis cultivar; the rationale for this study is how N supply and pruning affect cannabinoid yields and concentration in a commercial setting. Clones of a Cannabis sativa L. (CBD-type) were grown in a controlled-environment glasshouse in pots with coarse sand. After five weeks of vegetative growth under 210 mg/L N and an 18 h light regime, rates of 30, 60, 210, and 500 mg/L N were applied to plants for twelve weeks and a light regime set at 12 h. Double stem pruning was applied as an additional treatment to investigate efficacy on biomass increase. Biomass, N concentrations, and cannabinoid concentrations were measured after the final harvest. Pruning treatment did not increase cannabinoid concentrations or affect biomass. It was coincidentally found that plants on the glasshouse edge with higher exposure to sunlight developed more biomass and higher cannabinoid concentrations. Only biomass in leaves was increased significantly via higher nitrogen nutrition. Cannabinoid concentration, as well as cannabinoid yield per plant were decreased with the increase in N supply. High rates of fertilizer are not recommended because of reduced cannabinoid concentration and biomass yield: the ideal N supply is likely to be between 60 and 210 mg/L. This research will benefit growers and advisors in understanding the complexity of effects of nitrogen fertiliser and pruning practices on plant biomass and secondary metabolite production in medicinal cannabis.
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Claims 9
Claim · model-written summary
Pruning did not increase cannabinoid concentrations in Cannabis sativa
- Taxon
- Cannabis sativa
Cannabis sativat0 - Treatment
- Pruning treatmente1
- Outcome
- cannabinoid concentrationse1
- Direction
- did not increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pruning treatment did not increase cannabinoid concentrations or affect biomass”
t0“of Cannabis sativa”
Claim · model-written summary
Pruning did not change biomass of Cannabis sativa
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- Pruning treatmente1
- Outcome
- biomasse1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pruning treatment did not increase cannabinoid concentrations or affect biomass”
t0“of Cannabis sativa”
Claim · model-written summary
Plants with higher sunlight exposure at the glasshouse edge developed more biomass
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- higher exposure to sunlighte1
- Outcome
- biomasse1
- Direction
- moree1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It was coincidentally found that plants on the glasshouse edge with higher exposure to sunlight developed more biomass and higher cannabinoid concentrations”
t0“of Cannabis sativa”
Claim · model-written summary
Plants with higher sunlight exposure at the glasshouse edge had higher cannabinoid concentrations
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- higher exposure to sunlighte1
- Outcome
- cannabinoid concentrationse1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It was coincidentally found that plants on the glasshouse edge with higher exposure to sunlight developed more biomass and higher cannabinoid concentrations”
t0“of Cannabis sativa”
Claim · model-written summary
Higher nitrogen nutrition significantly increased leaf biomass of Cannabis sativa
- Taxon
- Cannabis sativaCannabis sativat0
- Organ / stage
- leavese1
- Treatment
- higher nitrogen nutritione1
- Outcome
- biomass in leavese1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Only biomass in leaves was increased significantly via higher nitrogen nutrition”
t0“of Cannabis sativa”
Claim · model-written summary
Increasing N supply decreased cannabinoid concentration of Cannabis sativa
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- increase in N supplye1
- Outcome
- Cannabinoid concentratione1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabinoid concentration, as well as cannabinoid yield per plant were decreased with the increase in N supply”
t0“of Cannabis sativa”
Claim · model-written summary
Increasing N supply decreased cannabinoid yield per plant of Cannabis sativa
- Taxon
- Cannabis sativaCannabis sativat0
- Treatment
- increase in N supplye1
- Outcome
- cannabinoid yield per plante1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabinoid concentration, as well as cannabinoid yield per plant were decreased with the increase in N supply”
t0“of Cannabis sativa”
Claim · model-written summary
The authors do not recommend high rates of fertilizer for Cannabis sativa
- Taxon
- Cannabis sativaCannabis sativat0
- Outcome
- High rates of fertilizere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“High rates of fertilizer are not recommended because of reduced cannabinoid concentration and biomass yield”
t0“of Cannabis sativa”
Claim · model-written summary
The authors suggest an ideal N supply of 60 to 210 mg/L for Cannabis sativa
- Taxon
- Cannabis sativaCannabis sativat0
- Outcome
- ideal N supplye1
- Value
- 60 and 210 mg/Le1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the ideal N supply is likely to be between 60 and 210 mg/L”
t0“of Cannabis sativa”
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See all 16 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.