Abstract
Five essential oil hemp (Cannabis sativa L.) cultivars (Cherry Blossom, Cherry Blossom (Tuan), Berry Blossom, Cherry Wine, and Cherry Blossom × Trump) were treated with six fertigation treatments to quantify the effects of synthetic fertilizer rates and irrigation electrical conductivity on plant growth, biomass accumulation, and cannabinoid profiles. Irrigation water was injected with a commercial 20-20-20 fertilizer at rates of 0, 50, 150, 300, 450, and 600 ppm nitrogen equating to 0.33 (control), 0.54, 0.96, 1.59, 2.22, and 2.85 dS m-1, respectively. Plants were grown under artificial lighting (18 hr) to maintain vegetative growth for eight weeks, followed by an eight-week flowering period. High linear relationship between chlorophyll concentrations and SPAD-502 measurements validated the utilization of SPAD meters to rapidly identify nutrient deficiency in essential oil hemp. Cultivars expressed significant variation in plant height and cannabinoid profiles (% dry mass), in concurrence with limited biomass and cannabinoid (g per plant) yield variation. Cherry Blossom was the best performing cultivar and Cherry Wine was the least productive. Variation in plant growth, biomass, and cannabinoid concentrations were affected to a greater extent by fertilizer rates. Optimal fertilizer rates were observed at 50 ppm N, while increased fertilizer rates significantly reduced plant growth, biomass accumulation, and cannabinoid concentrations. Increased fertilizer rates (> 300 ppm N) resulted in compliant THC levels (< 0.3%), although when coupled with biomass reductions resulted in minimal cannabinoid yields. Additionally, CBD concentration demonstrated higher sensitivity to increased fertilizer rates (> 300 ppm N) compared to THC and CBG (> 450 ppm N). The results of this study can serve as a guide when using fertigation methods on essential oil hemp cultivars; although results may differ with cultivar selection, environmental conditions, and management practices.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Chlorophyll concentrations were highly linearly related to SPAD measurements in hemp.
- Taxon
- Cannabis sativa L.
Cannabis sativat0 - Outcome
- chlorophyll concentrationse0
- Direction
- High lineare0
- Comparator
- SPAD-502 measurementse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High linear relationship between chlorophyll concentrations and SPAD-502 measurements”
t0“Cannabis sativa L.”
Claim · model-written summary
Cultivars differed significantly in plant height and cannabinoid profiles.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Outcome
- plant height and cannabinoid profilese0
- Direction
- variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivars expressed significant variation in plant height and cannabinoid profiles (% dry mass)”
t0“Cannabis sativa L.”
Claim · model-written summary
Cultivars showed limited variation in biomass and per-plant cannabinoid yield.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Outcome
- biomass and cannabinoid (g per plant) yield variatione0
- Direction
- limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limited biomass and cannabinoid (g per plant) yield variation”
t0“Cannabis sativa L.”
Claim · model-written summary
Cherry Blossom performed best among the cultivars.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Material
- Cherry Blossome0
- Outcome
- best performing cultivare0
- Direction
- beste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cherry Blossom was the best performing cultivar”
t0“Cannabis sativa L.”
Claim · model-written summary
Cherry Wine was least productive among the cultivars.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Material
- Cherry Winee0
- Outcome
- least productivee0
- Direction
- leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cherry Wine was the least productive”
t0“Cannabis sativa L.”
Claim · model-written summary
Fertilizer rates affected hemp growth, biomass and cannabinoid concentrations more than cultivar variation.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Treatment
- fertilizer ratese0
- Outcome
- plant growth, biomass, and cannabinoid concentrationse0
- Direction
- greater extente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variation in plant growth, biomass, and cannabinoid concentrations were affected to a greater extent by fertilizer rates.”
t0“Cannabis sativa L.”
Claim · model-written summary
The observed optimal fertilizer rate was 50 ppm N.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Outcome
- Optimal fertilizer ratese0
- Value
- 50 ppm Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimal fertilizer rates were observed at 50 ppm N”
t0“Cannabis sativa L.”
Claim · model-written summary
Higher fertilizer rates significantly reduced plant growth, biomass accumulation and cannabinoid concentrations.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Treatment
- increased fertilizer ratese0
- Outcome
- plant growth, biomass accumulation, and cannabinoid concentrationse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased fertilizer rates significantly reduced plant growth, biomass accumulation, and cannabinoid concentrations.”
t0“Cannabis sativa L.”
Claim · model-written summary
Fertilizer rates above 300 ppm N produced compliant THC levels below 0.3%.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Treatment
- Increased fertilizer rates (> 300 ppm N)e0
- Outcome
- THC levelse0
- Value
- < 0.3%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased fertilizer rates (> 300 ppm N) resulted in compliant THC levels (< 0.3%)”
t0“Cannabis sativa L.”
Claim · model-written summary
At fertilizer rates above 300 ppm N, biomass loss resulted in minimal cannabinoid yields.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Outcome
- cannabinoid yieldse0
- Direction
- minimale0
- Qualifier
- biomass reductionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when coupled with biomass reductions resulted in minimal cannabinoid yields”
t0“Cannabis sativa L.”
Claim · model-written summary
CBD concentration was sensitive to fertilizer rates above 300 ppm N, versus THC and CBG above 450 ppm N.
- Taxon
- Cannabis sativa L.Cannabis sativat0
- Treatment
- increased fertilizer rates (> 300 ppm N)e0
- Outcome
- CBD concentratione0
- Direction
- higher sensitivitye0
- Qualifier
- > 450 ppm Ne0
- Comparator
- THC and CBGe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CBD concentration demonstrated higher sensitivity to increased fertilizer rates (> 300 ppm N) compared to THC and CBG (> 450 ppm N)”
t0“Cannabis sativa L.”
The same questions in other papers
fertilization · growth · Cannabis sativaResults differ
4 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- no effect
17 papers more in this group
See all 21 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.