Episode 165: Boosting Yields 50% with a 13-Hour Photoperiod? Debunking Cannabis Science with Dr. Youbin Zheng

In this episode, we discuss: Bridging the Genetic Gap: Looking critically at how horticultural research transfers between high-THC cultivars and industrial hemp. The 13-Hour Photoperiod: Breaking the traditional 12/12 cycle to achieve a 39%–50% yield increase and a 9% THC boost. Linear Light Scaling: The direct relationship between light intensity and flower yield scaling all the way up to 1,800 micromoles under ambient CO2. The UV Reality Check: Why modern high-THC genetics actually showed a decrease in final cannabinoid and terpene content under supplemental UVA and UVB. Light Response Curves: Why relying on a single leaf measurement to guide your facility's light saturation point is fundamentally flawed. The Veg-to-Flower Transition: Practical SOPs for adjusting PPFD and DLI safely without shocking your canopy. Controlled Deficit Irrigation: How a single, targeted late-flower drought stress event triggers a 12%–13% spike in final THC and CBD content. The 60 PPM Phosphorus Rule: Looking at the established replication data proving that excess phosphorus wastes money, reduces yield efficiency, and impacts the environment. Links & Resources Mentioned in This Episode: Visit KIS Organics for commercial living soils, amendments, and consulting: https://www.kisorganics.com Grab Dr. Zheng's textbook, Handbook of Cannabis Production in Controlled Environments: https://www.amazon.com/Handbook-Cannabis-Production-Controlled-Environments/dp/0367712571 Access Dr. Zheng’s open-access research papers on Google Scholar: https://scholar.google.com/citations?user=ciGdnWAAAAAJ&hl=en Connect with us on Instagram: @kisorganics Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.