Abstract
Abstract With the passing of the 2014 US farm bill, there is more interest in industrial hemp ( Cannabis sativa L. < 0.3% total tetrahydrocannabinol [THC]) grown for cannabinoid production. However, production recommendations that outline fertilizer requirements of cannabidiol (CBD) hemp do not exist. Our primary objective was to identify nitrogen (N) and potassium (K) fertilizer rates for maximizing biomass and CBD yield. A secondary objective was to identify the relationships between N and K rates and total THC and total CBD concentrations. Fertilizer rates from 0 to 224 kg N and 0 to 185 kg K ha −1 were tested separately at four general locations in North Carolina. Two locations were used in 2019 and 2020, while the other two were used only in 2020. Dry weight yield was predicted to increase linearly from 1822 to 3384 kg biomass ha −1 as N rate increased from 0 to 86.8 kg ha −1 . Nitrogen rates above 86.8 kg ha −1 were not predicted to increase biomass. Likewise, as N rate increased from 0 to 84.2 kg N ha −1 , CBD yield was predicted to increase linearly from 204 to 389 kg CBD ha −1 . Additional N was not predicted to increase CBD yield. The CBD and THC concentrations showed a slight bell‐shaped response curve over increasing N rates, ranging from 11.33% to 12.11% and 0.473% to 0.509%, respectively. Potassium application did not affect yield nor CBD and THC concentrations. Results from this work indicate that N is a more limiting factor than K for maximizing CBD hemp biomass production.
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Claims 9
Claim · model-written summary
Dry weight yield was predicted to increase linearly with N rate from 0 to 86.8 kg ha−1.
- Taxon
- Cannabis sativa L.
Cannabis sativae0 - Treatment
- N ratee1
- Outcome
- Dry weight yielde1
- Direction
- increasee1
- Value
- 1822 to 3384 kg biomass ha −1e1
- Qualifier
- was predictede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e1“Dry weight yield was predicted to increase linearly from 1822 to 3384 kg biomass ha −1 as N rate increased from 0 to 86.8 kg ha −1”
Claim · model-written summary
N rates above 86.8 kg ha−1 were not predicted to increase biomass.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- Nitrogen rates above 86.8 kg ha −1e2
- Outcome
- biomasse2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e2“Nitrogen rates above 86.8 kg ha −1 were not predicted to increase biomass”
Claim · model-written summary
CBD yield was predicted to increase linearly with N rate from 0 to 84.2 kg N ha−1.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- N ratee3
- Outcome
- CBD yielde3
- Direction
- increasee3
- Value
- 204 to 389 kg CBD ha −1e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e3“as N rate increased from 0 to 84.2 kg N ha −1 , CBD yield was predicted to increase linearly from 204 to 389 kg CBD ha −1”
Claim · model-written summary
Additional N was not predicted to increase CBD yield.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- Additional Ne4
- Outcome
- CBD yielde4
- Direction
- no_changeinferrede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e4“Additional N was not predicted to increase CBD yield”
Claim · model-written summary
CBD concentration ranged from 11.33% to 12.11% over increasing N rates, with a slight bell-shaped response.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- increasing N ratese6
- Outcome
- CBD and THC concentrationse5
- Value
- 11.33% to 12.11%e7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e5“The CBD and THC concentrations showed a slight”
e6“over increasing N rates”
e7“ranging from 11.33% to 12.11% and 0.473% to 0.509%, respectively”
Claim · model-written summary
THC concentration ranged from 0.473% to 0.509% over increasing N rates, with a slight bell-shaped response.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- increasing N ratese6
- Outcome
- CBD and THC concentrationse5
- Value
- 0.473% to 0.509%e7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e5“The CBD and THC concentrations showed a slight”
e6“over increasing N rates”
e7“ranging from 11.33% to 12.11% and 0.473% to 0.509%, respectively”
Claim · model-written summary
Potassium application did not affect yield.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- Potassium applicatione1
- Outcome
- yielde1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e1“Potassium application did not affect yield nor CBD and THC concentrations”
Claim · model-written summary
Potassium application did not affect CBD and THC concentrations.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- Potassium applicatione1
- Outcome
- CBD and THC concentrationse1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e1“Potassium application did not affect yield nor CBD and THC concentrations”
Claim · model-written summary
N is a more limiting factor than K for maximizing CBD hemp biomass production.
- Taxon
- Cannabis sativa L.Cannabis sativae0
- Treatment
- Ne1
- Outcome
- CBD hemp biomass productione1
- Direction
- more limitinge1
- Comparator
- Ke1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cannabis sativa L.”
e1“N is a more limiting factor than K for maximizing CBD hemp biomass production”
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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.