Abstract
Optimizing plant density and vegetative growth duration is important for improving productivity in controlled-environment medicinal cannabis cultivation. Although both factors strongly influence canopy development and yield, their combined effects under modern high-intensity LED lighting, and particularly their consequences for cannabinoid uniformity across the canopy, remain insufficiently characterized. This study examined how planting density and vegetative duration influence plant growth, yield, and cannabinoid concentration in Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions, high-intensity LED lighting and precision fertigation. Two vegetative durations (10 and 28 days) were evaluated in separate but identical controlled-environment chambers under broad-spectrum high-intensity LED lighting and automated precision fertigation on rockwool substrate. The 10-day regime compared 8, 14 and 18 plants m−2; the 28-day regime compared 6, 8 and 10 plants m−2. Each combination was replicated across two independent cultivation cycles, and because density levels differed between regimes, direct between-regime comparisons were restricted to the shared density of 8 plants m−2. Extending the vegetative phase from 10 to 28 days increased plant height, stem diameter and internodal length. Area-based yield increased strongly with density, reaching 1091 g m−2 at 18 plants m−2 under the 10-day regime and 1009 g m−2 at 10 plants m−2 under the 28-day regime. Apical biomass exceeded basal biomass, but total THC concentration did not differ significantly among planting densities, vegetative durations or canopy positions. Higher planting densities combined with shorter vegetative periods can therefore increase area-based productivity while maintaining stable THC concentration under high-intensity LED cultivation.
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Claims 6
Claim · model-written summary
Extending the vegetative phase from 10 to 28 days increased plant height, stem diameter and internodal length.
- Taxon
- Cannabis sativa L.
Cannabis sativae1 - Material
- Fat Bananae1
- Treatment
- Extending the vegetative phase from 10 to 28 dayse0
- Outcome
- plant height, stem diameter and internodal lengthe0
- Direction
- increasede0
- Setting
- controlled-environment chamberse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extending the vegetative phase from 10 to 28 days increased plant height, stem diameter and internodal length”
e1“Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions”
e2“Two vegetative durations (10 and 28 days) were evaluated in separate but identical controlled-environment chambers”
Claim · model-written summary
Area-based yield of Cannabis sativa increased strongly with planting density.
- Taxon
- Cannabis sativa L.Cannabis sativae1
- Treatment
- densitye3
- Outcome
- Area-based yielde3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions”
e3“Area-based yield increased strongly with density, reaching 1091 g m−2 at 18 plants m−2 under the 10-day regime and 1009 g m−2 at 10 plants m−2 under the 28-day regime”
Claim · model-written summary
Area-based yield reached 1091 g m−2 at 18 plants m−2 under the 10-day regime.
- Taxon
- Cannabis sativa L.Cannabis sativae1
- Treatment
- 18 plants m−2e3
- Outcome
- Area-based yielde3
- Value
- 1091 g m−2e3
- Qualifier
- under the 10-day regimee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions”
e3“Area-based yield increased strongly with density, reaching 1091 g m−2 at 18 plants m−2 under the 10-day regime and 1009 g m−2 at 10 plants m−2 under the 28-day regime”
Claim · model-written summary
Area-based yield reached 1009 g m−2 at 10 plants m−2 under the 28-day regime.
- Taxon
- Cannabis sativa L.Cannabis sativae1
- Treatment
- 10 plants m−2e3
- Outcome
- Area-based yielde3
- Value
- 1009 g m−2e3
- Qualifier
- under the 28-day regimee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions”
e3“Area-based yield increased strongly with density, reaching 1091 g m−2 at 18 plants m−2 under the 10-day regime and 1009 g m−2 at 10 plants m−2 under the 28-day regime”
Claim · model-written summary
Apical biomass exceeded basal biomass in Cannabis sativa.
- Taxon
- Cannabis sativa L.Cannabis sativae1
- Outcome
- Apical biomasse4
- Direction
- exceedede4
- Comparator
- basal biomasse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions”
e4“Apical biomass exceeded basal biomass”
Claim · model-written summary
Total THC concentration did not differ significantly among planting densities, vegetative durations or canopy positions.
- Taxon
- Cannabis sativa L.Cannabis sativae1
- Treatment
- planting densities, vegetative durations or canopy positionse5
- Outcome
- total THC concentratione5
- Direction
- did not differe5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cannabis sativa L. (strain ‘Fat Banana’) grown under controlled environment conditions”
e5“total THC concentration did not differ significantly among planting densities, vegetative durations or canopy positions”
The same questions in other papers
density · molecular: metabolites · Cannabis sativaPositive and negative results
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- positive
- no effect
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density · yield · Cannabis sativaPositive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
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5 papers more in this group
See all 9 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.