Importance of Photoperiodic Cultivation for High-Quality Perilla Leaf Production

Geumsan County Emphasizes Nighttime Lighting
to Suppress Flower Bud Differentiation

Photo by Geumsan County

August is a crucial period that can determine the success or failure of perilla leaf cultivation, and the importance of photoperiodic cultivation is emphasized in order to increase the production of high-quality perilla leaves.

Photoperiodic cultivation is a technique that controls plant growth using artificial light. In the case of perilla leaves, if the photoperiod exceeds 15 hours, flower bud differentiation is suppressed, allowing continuous harvesting of the leaves.

The natural flowering period for perilla leaves in the Geumsan region is around September 6, when the day length is 12 hours and 30 minutes.

For perilla leaf photoperiodic cultivation, lighting should begin when two true leaves have emerged. From the time the true leaves appear until May 1 of the following year, it is recommended to operate nighttime lighting.

Lighting should be provided for at least 5 hours per day, with a basic setting of 2 hours starting from midnight.

The light intensity should be maintained at 25 lux or higher. One 9W LED bulb should be installed at a height of 2 meters in the center of the greenhouse for every 4 to 5 pyeong, spaced 1 to 1.5 meters apart. If the width of the greenhouse is 7.5 meters or more, it is recommended to install two rows of lights.

Additionally, a method can be used in which the lights are turned on for 5 minutes and then off for 15 minutes, repeating this cycle from 8:00 p.m. to 4:00 a.m.

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