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  • Title: Influence of photoperiodism on cannabinoid content of Cannabis sativa L.
    Author: Valle JR, Vieira JE, Aucélio JG, Valio IF.
    Journal: Bull Narc; 1978; 30(1):67-8. PubMed ID: 248289.
    Abstract:
    Cannabis sativa plants submitted to 10 and 12 hours of natural light showed different content in cannabinoids. An increase of exposure to natural light of only 2 hours a day, at least, doubled the average amoung of THC, but decreased that of cannabichromene.
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