Photosynthesis Related to Cannabis Production

Photosynthesis Related to Cannabis Production

Professor DeBacco


Basic Photosynthesis (Ps) Equation
Any reactant can be a limiting competent to the equation
CO2 can easily be a limiting factor especially during high light intensity



Light Spectrum
Sunlight's Spectrum
Chlorophyll
Chlorophyll (also chlorophyl) is any of several related green pigments found in the mesosomes of cyanobacteria and in the chloroplasts of algae and plants.
Chlorophyll is essential in photosynthesis, allowing plants to absorb energy from light.
Chlorophylls absorb light most strongly in the blue portion of the electromagnetic spectrum as well as the red portion.
Conversely, it is a poor absorber of green and near-green portions of the spectrum, which it reflects, producing the green color of chlorophyll-containing tissues.
Two types of chlorophyll exist in the photosystems of green plants: chlorophyll a and b.



Plants Absorbing more than just with chlorophyll
Utilization of Various Wavelengths of Light
Dutta Gupta, Snehasish & Agarwal, Avinash. (2017). Artificial Lighting System for Plant Growth and Development: Chronological Advancement, Working Principles, and Comparative Assessment. 10.1007/978-981-10-5807-3_1.
https://www.researchgate.net/publicat...

Research Article
Chandra, S., Lata, H., Khan, I. A., & Elsohly, M. A. (2008). Photosynthetic response of Cannabis sativa L. to variations in photosynthetic photon flux densities, temperature and CO2 conditions. Physiology and molecular biology of plants : an international journal of functional plant biology, 14(4), 299–306. https://doi.org/10.1007/s12298-008-00...
https://www.ncbi.nlm.nih.gov/pmc/arti...



Cannabis is a High Light Intensity Plant
Sunlight has a light intensity (PPFD) of 2000 umol/m2/sec
Not economic to provide this light level for an indoor operation
Cannabis is often given a PPFD of 1000 umol/m2/sec to aid in plant quality.
In comparison a low light intensity plant such as lettuce can grow well in only a PPFD of 200 umol/m2/sec

PPFD and Temperature
A combination of 30 oC temperature and 1500 μmol m-2s-1 PPFD,
may be best suitable for the indoor cultivation of C. sativa.
Light Quantity vs Quality
Light quantity (DLI) correlates more with biomass
More light = more plant (at least following the biological curve/plateau)
Light quality or color (PAR reading) impacts the morphology of the plant


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