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

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