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Ec sensitivity of hydroponically-grown lettuce (Lactuca sativa l.) types in terms of nitrate accumulation

Kappel, Noémi and Boros, Ildikó Fruzsina and Ravelombola, Francia Seconde and Sipos, László (2021) Ec sensitivity of hydroponically-grown lettuce (Lactuca sativa l.) types in terms of nitrate accumulation. Agriculture (Switzerland), 11. p. 315. ISSN 2077-0472

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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).

Item Type: Article
Uncontrolled Keywords: butterhead; loose leaf; oak leaf; lettuce; EC; nitrate
Subjects: S Agriculture / mezőgazdaság > SB Plant culture / növénytermesztés
Depositing User: Dr. László Sipos
Date Deposited: 27 Sep 2021 07:39
Last Modified: 03 Apr 2023 07:23
URI: http://real.mtak.hu/id/eprint/130621

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