Effect of Post-harvesting with Different Photoperiods under Artificial Light Sources on Nitrate and Vitamin C Contents in Hydroponic Green Oak Lettuce

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Published: Mar 26, 2023
DOI: https://doi.org/10.55164/ajstr.v26i2.247845
Keywords:
Green oak lettuce nitrate vitamin C hydroponic system photoperiods post-harvest artificial light source

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Nang Myint Phyu Sin Htwe
Urban Agriculture Technology Research Group, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand
Maneerat Rawangpai
Urban Agriculture Technology Research Group, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand
Eaknarin Ruangrak
Department of Agricultural and Fisheries Science, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand

Abstract

Green oak lettuce (Lactuca sativa L.) is a popular vegetable for consumers, but it is concerned about nitrate contamination that may harm human health. However, light can affect nitrate reduction and contribute to the accumulation of vitamin C in vegetables. Therefore, this study focused on the effects of post-harvesting with different photoperiods under artificial light sources on vitamin C and nitrate content in hydroponic green oak lettuce. Green oak lettuces were grown in the NFT system, harvested, and post-harvested under Bulb-LED (Experiment I), Bar-LED (Experiment II), and fluorescent lamp (FL) (Experiment III) for 6, 12, and 24 h photoperiods and replaced the nutrient solution with tap water. The nitrate content was significantly reduced after post-harvesting for 12 h photoperiods under FL (9,012 µg NO3- -N/g dry weight) followed by Bulb-LED (13,985 µg NO3- -N/g dry weight) and 24 h photoperiods for Bar-LED (10,727 µg NO3- -N/g dry weight). Vitamin C content was highest after post-harvesting for 24 h photoperiods under Bar-LED (45.47 µg/ml), followed by Bulb-LED (44.73 µg/ml) and FL (35.40 µg/ml). Post-harvesting with artificial light sources for 12 to 24 h photoperiods can improve hydroponic green oak lettuce quality.

Article Details

Issue
Vol. 26 No. 2 (2023): April - June 2023
Section
Research Articles
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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