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EC Sensitivity of Hydroponically-Grown Lettuce ( Lactuca sativa L.) Types in Terms of Nitrate Accumulation

Author

Listed:
  • Noémi Kappel

    (Department of Vegetable and Mushroom Growing, Institute of Horticultural Science, Hungarian University of Agriculture and Life Sciences, Villányi út 29-43, 1118 Budapest, Hungary)

  • Ildikó Fruzsina Boros

    (Department of Vegetable and Mushroom Growing, Institute of Horticultural Science, Hungarian University of Agriculture and Life Sciences, Villányi út 29-43, 1118 Budapest, Hungary
    Department of Postharvest, Supply Chain, Commerce and Sensory Science, Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences, Villányi út 29-43, 1118 Budapest, Hungary)

  • Francia Seconde Ravelombola

    (Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701, USA)

  • László Sipos

    (Department of Postharvest, Supply Chain, Commerce and Sensory Science, Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences, Villányi út 29-43, 1118 Budapest, Hungary)

Abstract

The goal of this research was to investigate the effect of electrical conductivity (EC) levels of the nutrient solution on the fresh weight, chlorophyll, and nitrate content of hydroponic-system-grown lettuce. The selected cultivars are the most representative commercial varieties grown for European markets. Seven cultivars (‘Sintia,’ ‘Limeira,’ ‘Corentine,’ ‘Cencibel,’ ‘Kiber,’ ‘Attiraï,’ and ‘Rouxaï’) of three Lactuca sativa L. types’ (butterhead, loose leaf, and oak leaf) were grown in a phytotron in rockwool, meanwhile the EC level of the nutrient solutions were different: normal (<1.3 dS/m) and high (10 dS/m). The plants in the saline condition had a lower yield but elevated chlorophyll content and nitrate level, although the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels. The results and the special characteristic of the lollo-type cultivars showed that the nitrate level could be very different due to salinity (‘Limeira’ had the lowest (684 µg/g fresh weight (FW)) and ‘Cencibel’ had the highest (4396 µg/g FW)). There was a moderately strong negative correlation (−0.542) in the reverse ratio among the chlorophyll and nitrate contents in plants treated with a normal EC value, while this relationship was not shown in the saline condition. Under the saline condition, cultivars acted differently, and all examined cultivars stayed under the permitted total nitrate level (5000 µg/g FW).

Suggested Citation

  • Noémi Kappel & Ildikó Fruzsina Boros & Francia Seconde Ravelombola & László Sipos, 2021. "EC Sensitivity of Hydroponically-Grown Lettuce ( Lactuca sativa L.) Types in Terms of Nitrate Accumulation," Agriculture, MDPI, vol. 11(4), pages 1-12, April.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:4:p:315-:d:529948
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    References listed on IDEAS

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    1. Pasternak, D. & De Malach, Y. & Borovic, I. & Shram, M. & Aviram, C., 1986. "Irrigation with brackish water under desert conditions IV. Salt tolerance studies with lettuce (Lactuca sativa L.)," Agricultural Water Management, Elsevier, vol. 11(3-4), pages 303-311, September.
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    Cited by:

    1. Yi-Ju Wang & Teng Yang & Hye-Ji Kim, 2023. "pH Dynamics in Aquaponic Systems: Implications for Plant and Fish Crop Productivity and Yield," Sustainability, MDPI, vol. 15(9), pages 1-20, April.

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