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Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes
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SUBSTANTIATION OF OPTIMAL LIGHTING REGIMES FOR PLANTS IN SPACE GREENHOUSE <>.

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    Optimizing LED lighting for Chinese cabbage (Brassica chinensis L.) involves specific light parameters. Researchers found optimal conditions for dry mass yield and photosynthesis efficiency using red and white LEDs.

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    Area of Science:

    • Horticultural science
    • Plant physiology
    • Agricultural engineering

    Background:

    • Optimizing crop yield in controlled environments requires precise control over lighting conditions.
    • LED technology offers tunable light spectra and intensity for enhanced plant growth.
    • Brassica chinensis L. (Chinese cabbage) is a widely cultivated vegetable sensitive to light quality and quantity.

    Purpose of the Study:

    • To determine the optimal lighting regimes using a combination of red and white LEDs for Brassica chinensis L. cultivation.
    • To establish regressive relationships between LED parameters and plant dry mass yield.
    • To identify optimal light parameters for maximizing both biomass and photosynthesis efficiency.

    Main Methods:

    • A 3-factor experiment was conducted over 24 days with Brassica chinensis L. crops.
    • Variable parameters included photosynthetic photon flux density (PPFD), the ratio of red to white PPFD, and pulse period.
    • Experimental data were analyzed to develop regression models for predicting dry mass yield and optimal light criteria.

    Main Results:

    • Optimal time-averaged PPFD was determined to be 500 μmol/(m²·s).
    • The ideal ratio of red PPFD to white PPFD was found to be 1.5.
    • An optimal pulse period of 501 ps was identified for maximizing growth and efficiency.

    Conclusions:

    • Specific LED lighting parameters significantly influence the dry mass yield and photosynthesis efficiency of Chinese cabbage.
    • The study provides precise recommendations for LED light settings in controlled agricultural environments.
    • Findings can inform the design of energy-efficient lighting systems for commercial greenhouses, such as the Vitacycle-To project.