Edward Borowski

University of Life Sciences in Lublin

Barbara Hawrylak-Nowak

University of Life Sciences in Lublin

Sławomir Michałek

University of Life Sciences in Lublin


In two successive pot experiments with lettuce cv. ‘Królowa Majowych’, conducted in a phytotron, this study investigated the effect of cool white fluorescent light
(FRS) at a PPFD 200 μmol·m-2·s-1 and red-blue LED light at a PPFD of 200 and 800 μmol·m-2·s-1 on photosynthesis, yield, leaf area, SLA, and the content of photosynthetic pigments, total N and nitrates. Experimental plants were grown in sphagnum peat supplemented with full-strength Hoagland’s solution at the beginning of the experiment. 10 days after plants were pricked out, 4 experimental series were made which differed in the form of N supplied to the growing medium at a rate of 420 mg (2N): 1) Hoagland’s solution (control); 2) Hoagl + 2N-NO3; 3) Hoagl + 2N-NH4; 4) Hoagl + 2N-NH4/NO3. The obtained results showed that the lettuce leaf yield under FRS light was distinctly higher than under LED light at a PPFD of 200, and in particular at 800 μmol·m-2·s-1. Besides, the leaves grown under FRS light showed a significantly thinner leaf blade (SLA) and a lower content of photosynthetic pigments, total N and nitrates. The photosynthetic
rate was higher under LED light relative to FRS light. Different nutrition of plants with N-NO3, N-NH4 and N-NH4/NO3 had a similar effect on the yield and analysed traits of lettuce leaves, regardless of the type of light and the level of irradiation with LED light. LED lamps seem to be a very promising light source for plants, but they require further research on how to adapt the spectral distribution of light to their requirements.


spectral composition, Lactuca sativa, yield, leaf area, SLA, photosynthetic pigments, N-total, nitrates, photosynthesis

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Edward Borowski 
University of Life Sciences in Lublin
Barbara Hawrylak-Nowak 
University of Life Sciences in Lublin
Sławomir Michałek 
University of Life Sciences in Lublin



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