Estimation of Lighting Energy Consumption Required for Red Leaf Lettuce Production under Different Blue/Red Ratios and Light Intensity Conditions in a Plant Factory with Artificial Lighting

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  • 植物工場における異なる赤青光比および光強度下で育成した赤系リーフレタスの株生産に必要な照明電力量の推定
  • ショクブツ コウジョウ ニ オケル コトナル アカ セイ ヒカリヒ オヨビ ヒカリ キョウド カ デ イクセイ シタ セキケイ リーフレタス ノ カブ セイサン ニ ヒツヨウ ナ ショウメイ デンリョクリョウ ノ スイテイ

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We cultivated red leaf lettuce under different blue/red (B/R) ratios and photosynthetic photon flux densities (PPFDs) and calculated the amount of light received by plants from the start of treatment to harvest. Four treatments were tested from 14 days after sowing by using a combination of 150 and 250 μmol m-2 s-1 PPFDs and 0.18 and 0.23 B/R ratios with a mix of blue (450 nm) and red (660 nm) light-emitting diodes (LEDs). Planting density was fixed at 12.9 plants m-2 to avoid mutual shading of the plants. Plants were harvested when the fresh weight of their above-ground parts reached approximately 100 g. The lighting energy consumption per plant required for the test period was calculated from summing the daily value multiplied by the amount of light received to the whole plant by the lighting electric power of the light source. We then compared two planting density managements: a fixed planting density of 12.9 plants m-2, and optimal spacing achieved by daily changing the square arrangement of plants. For the B/R ratio effect, with a fixed planting density at 150 μmol m-2 s-1, the lighting energy consumption was lower at a B/R ratio of 0.23 than that at 0.18. At 250 μmol m-2 s-1, there was no difference between the B/R ratios. However, with optimal spacing, at both PPFDs, the lighting energy consumption was lower at the 0.18 than at the 0.23 B/R ratio. For the PPFD effect, with a fixed planting density, the lighting energy consumption was lower at 150 than at 250 μmol m-2 s-1. However, with optimal spacing, the lighting energy consumption was lower at 250 than at 150 μmol m-2 s-1. Therefore, among the four treatments, the combination of 0.18 B/R ratio and 250 μmol m-2 s-1 PPFD was the most efficient in terms of minimizing lighting energy consumption.

Journal

  • Shokubutsu Kankyo Kogaku

    Shokubutsu Kankyo Kogaku 29 (2), 60-67, 2017

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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