Examining Spectral Photon Flux Density and Lighting Position and Direction for Green Onion Production in a Plant Factory Using LEDs

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<p>Green onions (Allium fistulosum L.) are an essential flavoring vegetable in Asian cuisine with high nutritional value. To ensure their stable future production, efficiently cultivating them in plant factories is necessary. In this study, we investigated the effects of spectral photon flux density and lighting position and direction for green onion production using two cultivars (ʻWhite Starʼ and ʻFukuichi-Negiʼ). First, we investigated the effects of four types of light-emitting diode (LED) lamps with or without far-red light and different red/blue (R/B) ratios on the growth of the green onion cultivars. ʻWhite Starʼ had the highest shoot fresh weight when grown under low blue-light ratio LED lamps with far-red light, while ʻFukuichi-Negiʼ had the highest shoot fresh weight under medium blue-light ratio LED lamps. The R/B ratio and far-red light affected green onion growth, with the effect varying among the varieties. Furthermore, we investigated a light irradiation method to increase the production efficiency of green onions. We compared the growth of the two green onion varieties by irradiating the top of the plants (conventional method) or their sheath base from the lateral direction (sideward irradiation). The results showed that the shoot fresh weight of ʻWhite Starʼ and ʻFukuichi-Negiʼ grown under sideward irradiation were 1.5- and 1.3-fold higher than those under the conventional method, respectively.</p><p>This study provides important knowledge for improving the efficiency of green onion production in plant factories using LEDs.</p>

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  • Eco-Engineering

    Eco-Engineering 36 (1), 17-24, 2024-01-31

    生態工学会

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