Publication: Enhancement of Lettuce Growth by PAW Spray Gliding Arc Plasma Generator
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Issued Date
2021
Resource Type
Language
eng
File Type
application/pdf
ISSN
933813
Other identifier(s)
2-s2.0-85113878130
Rights Holder(s)
Scopus
Bibliographic Citation
IEEE Transactions on Plasma Science. Vol , No. (2021)
Suggested Citation
Matra K., Tanakaran Y., Luang-In V., Theepharaksapan S. Enhancement of Lettuce Growth by PAW Spray Gliding Arc Plasma Generator. IEEE Transactions on Plasma Science. Vol , No. (2021). doi:10.1109/TPS.2021.3105733 Retrieved from: https://hdl.handle.net/20.500.14740/7989
Author(s)
Abstract
The effect of non-thermal air plasma on green oak lettuce farming has been proposed. A gliding arc plasma generator (GAPG) was designed for plasma-activated water (PAW) spray generation. A PAW spray was generated at 8, 10, and 12 kV by a custom-made ac high voltage power supply. Four hydroponic green oak lettuce trays were treated by PAW spray at different conditions for 10 min, three times a day for nine days. The experimental results showed that all the plasma-treated green oak lettuce sprouts had a greater growth rate than the control group. The best condition was found in the PAW spray generated at 8 kV source voltage, which led to the longest average height and width of sprouts of 10.88 ± 0.33 cm and 10.09 ± 0.08 cm, respectively. Moreover, its average dried weight was also significantly greater than that of the control group by 1.69 times. It was found that the concentration of total Kjeldahl nitrogen (TKN), mainly ammonium, was enhanced in every PAW spray condition. However, the highest TKN concentration was found in the 8 kV PAW spray, which was 3.67 times higher than that of the control group. The amount of nitrite (NO₂⁻) and nitrate (NO₃⁻) in PAW spray was also enhanced but in the opposite trend to TKN concentration. Moreover, the electrical conductivity (EC) and pH levels could be improved by air plasma. It could be confirmed that the plasma treatment could be effectively applied to green oak lettuce farming, and the PAW spray generated by the GAPG could enhance the amount of nitrogenous fertilizer in treated water, which is essential for plant growth stimulation. IEEE