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Importance of Light in Greenhouse Crop Growth: Temperature, CO2, and More

Understanding the role of light in greenhouse farming is crucial for optimizing crop growth. Key factors include light quality, intensity, and duration, as well as accumulated daily radiant energy. The electromagnetic spectrum influences photosynthesis, while intensity levels from 50 to 10,000 foot-candles affect growth rates. Proper timing, spacing, and water management alongside fertilization are critical for successful cultivation. By managing these variables effectively, growers can enhance photosynthesis, improve plant quality, and achieve better yields throughout different seasons.

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Importance of Light in Greenhouse Crop Growth: Temperature, CO2, and More

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  1. IV. LIGHT A. Importance to Greenhouse Crops • temperature • CO2 • water • fertilization • timing • spacing • retardant

  2. B. Natural Light Properties 1. Quality -electromagnetic spectrum 2. Intensity -range summer --max-- 10,000 ft-cds 2000 umols/m2/sec winter --max-- 800 ft-cds 60 umols/m2/sec

  3. 3. Duration -range 0-24 hrs -Kentucky 9-15 hrs 4. Accumulated light daily a. range summer ----- moles/day/m2 winter ----- moles/day/m2

  4. Factors • Cloud • Smog • Trees, buildings c. Daily accumulated radiant energy in greenhouse - type of covering - shadows in greenhouses

  5. C. Plant Response to Light 1. Quality a. photosynthesis 400-700 A (visible spectrum) b. photoperiod 700-800 A (red/farred)

  6. 2. Intensity a. photosynthesis 50-10000 ft-cds 2-2000 umol/m2/sec temp. & CO2 dependent increase intensity -- increase photosynthesis

  7. b. photoperiod 5-15 ft-cds 1-2 umols/m2/sec c. greenhouse 40-60% external intensity

  8. 3. Duration a. photosynthesis increase duration -- increase photosynthesis (9-20+ hrs) b. photoperiodic short (1-4 hrs/night)

  9. 4. Accumulated - correlates with increased photosynthesis/growth 20-30 moles/day - range low - slow growth - poor quality excess - chlorophyll destruction dessication fading of flower

  10. January February March April

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