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Growth Characteristics and DPPH Radical Scavenging Activity of Lettuce 'Fidel' in Plant Factory Using Activated Mineral Groups and Light-emitting Diode Lights

  • Song, Tae-Eui (Department of Horticulture Life Sciences, Hankyong National University) ;
  • Park, Seong-Jik (Department of Bioresources and Rural Systems Engineering, Hankyong National University) ;
  • Moon, Joon-Kwan (Department of Plant Life and Environment Sciences, Hankyong National University) ;
  • Kim, In Soo (Insungtec Company Limited) ;
  • Lee, Chang Hee (Department of Horticulture Life Sciences, Hankyong National University)
  • Received : 2019.06.05
  • Accepted : 2019.06.20
  • Published : 2019.06.30

Abstract

This study is conducted to investigate the effects of growth characteristics (GC) and DPPH radical scavenging activity (DRSA) of the heading lettuce 'Fidel' depending on four concentrations of activated mineral groups (AMG: 1.6% active minerals and 0.03% CaO) added to basic nutrient solutions (diluted by 0, 0.05, 0.1, and 0.2%) and on four different light-emitting diodes (LED; B:R:W ratio = 0:1:12, 0:1:9, 0:5:5, and 2:3:5). Both 0.1 and 0.2% AMG showed better GC of lettuce in plant width, plant length, leaf width, leaf length, and the number of leaves than those of other AMG, while leaf thickness and chlorophyll value did not show significant difference among all AMG. Moreover, 0.1 and 0.2% AMG showed heavier shoot fresh weights than those of other AMG. As for the combinations of AMG and LED, B0:R5:W5 showed the best lettuce GC regardless of AMG compared to other AMG and LED combinations. As shown in the above results of LED, although there was a difference in lettuce growth by LED, the differences of lettuce growth by AMG were statistically significant. The DRSA was the highest at 82.8% in B2:R3:W5, followed by B0:R5:W5 at 77.8%. LED showed differences but AMG did not affect DRSA. Therefore, the optimal conditions in plant factory for GC and DRSA of the lettuce were 0.1% AMG and B0:R5:W5.

Keywords

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Fig. 1. Heading lettuce ‘Fidel’ and NFT system in the plant factory used in this experiment.

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Fig. 2. Weekly changes of the shoot fresh weight of heading lettuce ‘Fidel’ depending on AMG concentration.

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Fig. 3. The shoot fresh weight of heading lettuce ‘Fidel’ influenced by LED and AMG.

Table 1. Comparison of nutrient solutions between Basic and Yamazaki

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Table 2. Growth characteristics of heading lettuce ‘Fidel’ influenced by AMG at the harvest stagez

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Table 3. Growth characteristics of heading lettuce ‘Fidel’ influenced by AMG and LED at the harvest stagez

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Table 3. Continued

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Table 4. DPPH radical scavenging activity of heading lettuce ‘Fidel’ influenced by LED and AMG

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