The Impact of Light Intensity and Spectrum-Tuning on Cannabis Yields

Eaves, James; Eaves, Stephen; Morphy, Chad; Murray, Chris

doi:10.2139/ssrn.3310456

Cited by 1 publication

(3 citation statements)

References 4 publications

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“…In general, cannabis photosynthesis and yield responses to localized LI were linear across the APPFD range of 120 to 1800 μmol•m -2 •s -1 . While these results are in agreement with the contemporary literature on cannabis (Bauerle et al, 2020;Chandra et al, 2008;Eaves et al, 2020;Potter and Duncombe, 2012), we also showed substantial chronological dependencies on leaf photosynthetic indices.…”

Section: Plasticity Of Cannabis Leaf Morphology and Physiology Responsupporting

confidence: 93%

“…Even under ambient CO2, the linear increases in yield indicated that the availability of PAR photons was still limiting whole-canopy photosynthesis at APPFD levels as high as ≈ 1800 μmol•m -2 •s -1 (i.e., DLI ≈ 78 mol•m -2 •d -1 ). These results were generally consistent with the trends of other studies reporting linear cannabis yield responses to LI (Eaves et al, 2020;Potter and Duncombe, 2012;Vanhove et al, 2011), although there is considerable variability in both relative and absolute yield responses to LI in these prior works. The present study covered a broader range of LI, and with much higher granularity, compared with other similar studies.…”

Section: Cannabis Inflorescence Yield Is Proportional To Light Intensitysupporting

confidence: 90%

“…It is therefore impossible to accurately ascertain canopy-level LI in these models. Eaves et al (2020) reported linear relationships between canopy-level LI (up to 1500 µmol•m -2 •s -1 ) and yield; however, they had only one LI treatment above 1000 µmol•m -2 •s -1 . Further, they reported substantial inter-repetition variability in their yield models, which indicates that factors other than LI may have limited crop productivity in some circumstances.…”

Section: Introductionmentioning

confidence: 97%

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Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to Increasing Light Levels in an Indoor Environment

Morrison¹,

Llewellyn²,

Zheng³

2021

Preprint

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Since the recent legalization of medical and recreational use of cannabis (Cannabis sativa L.) in many regions worldwide, there has been high demand for research to improve yield and quality. With the paucity of scientific literature on the topic, this study investigated the relationships between light intensity (LI) and photosynthesis, inflorescence yield, and inflorescence quality of cannabis grown in an indoor environment. After growing vegetatively for 2 weeks under a canopy-level photosynthetic photon flux density (PPFD) of ≈ 425 μmol·m-2·s-1 and an 18-h light/6-h dark photoperiod, plants were grown for 12 weeks in a 12-h light/12-h dark ‘flowering’ photoperiod under canopy-level PPFDs ranging from 120 to 1800 μmol·m-2·s-1 provided by light emitting diodes. Leaf light response curves varied both with localized (i.e., leaf-level) PPFD and temporally, throughout the flowering cycle. Therefore, it was concluded that the leaf light response is not a reliable predictor of whole- plant responses to LI, particularly crop yield. This may be especially evident given that dry inflorescence yield increased linearly with increasing canopy-level PPFD up to 1800 μmol·m-2·s-1, while leaf-level photosynthesis saturated well below 1800 μmol·m-2·s-1. The density of the apical inflorescence and harvest index also increased linearly with increasing LI, resulting in higher-quality marketable tissues and less superfluous tissue to dispose of. There were no LI treatment effects on cannabinoid potency, while there were minor LI treatment effects on terpene potency. Commercial cannabis growers can use these light response models to determine the optimum LI for their production environment to achieve the best economic return; balancing input costs with the commercial value of their cannabis products.

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Section: Plasticity Of Cannabis Leaf Morphology and Physiology Responsupporting

confidence: 93%

Section: Cannabis Inflorescence Yield Is Proportional To Light Intensitysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to Increasing Light Levels in an Indoor Environment

Morrison¹,

Llewellyn²,

Zheng³

2021

Preprint

View full text Add to dashboard Cite

show abstract

The Impact of Light Intensity and Spectrum-Tuning on Cannabis Yields

Cited by 1 publication

References 4 publications

Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to Increasing Light Levels in an Indoor Environment

Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to Increasing Light Levels in an Indoor Environment

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