Horticulture, Environment, and Biotechnology

, Volume 55, Issue 4, pp 293–298 | Cite as

Air anions enhance lettuce growth in plant factories

  • Min-Jeong Song
  • Tae-Hwan Kang
  • Chung-Su Han
  • Myung-Min Oh
Research Report Protected Horticulture

Abstract

This study was conducted to determine the effect of air anions on lettuce growth in a plant factory. Red leaf lettuce (Lactuca sativa L. cv. ‘Jeokchima’) seedlings grown under normal growth conditions (20°C, fluorescent lamp, 150 ± 3 μmol·m−2·s−1 PPFD, 12-h photoperiod) for 18 days were transplanted to hydroponic systems in a plant factory equipped with LEDs (red:blue = 78:22, 184 ± 2 μmol·m−2·s−1 PPFD, 12-h photoperiod). Three levels of air anions (low, 10 × 104 ion·cm−3; medium, 19 × 104 ion·cm−3; and high, 70 × 104 ion·cm−3) were applied to lettuce plants for 4 weeks. Lettuce plants exposed to air anions showed vigorous growth after 2 and 4 weeks of treatment. Both the medium and high levels of air anions improved growth characteristics such as leaf area and fresh weight of shoots, but there were no significant differences in the number of leaves and SPAD values were observed between the treatments. The medium level of air anions resulted in a 64% increase in shoot fresh weight compared to the control at 4 weeks after treatment. The photosynthetic rate of lettuce grown in the medium level of air anions after 3 weeks of treatment was 30% higher than that of the control. In addition, energy use efficiency in air anion treatments was higher than that in the control. In conclusion, this study demonstrated that the application of air anions in a plant factory imparts a positive effect on lettuce growth with low production cost.

Additional key words

energy use efficiency photosynthetic rate 

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Copyright information

© Korean Society for Horticultural Science and Springer-Verlag GmbH 2014

Authors and Affiliations

  • Min-Jeong Song
    • 1
    • 2
  • Tae-Hwan Kang
    • 3
  • Chung-Su Han
    • 4
  • Myung-Min Oh
    • 1
    • 2
  1. 1.Division of Animal, Horticultural, and Food SciencesChungbuk National UniversityCheongjuKorea
  2. 2.Brain Korea 21 Center for Bio-resource DevelopmentChungbuk National UniversityCheongjuKorea
  3. 3.Department of Bio-industry Mechanical EngineeringKongju National UniversityGongjuKorea
  4. 4.Department of Bio-systems EngineeringChungbuk National UniversityCheongjuKorea

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