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The response of lettuce to fluorescent light and led light relative to different nitrogen nutrition of plants

100%

Borowski E., Hawrylak-Nowak B., Michalek S.

Acta Scientiarum Polonorum. Hortorum Cultus

2014

tom 13

nr 5

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 ȝmol·m-2·s -1 and red-blue LED light at a PPFD of 200 and 800 ȝmol·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 ȝmol·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.

Wplyw barwy swiatla na wzrost rozsady pomidora [Lycopersicon esculentum Mill.]

80%

Glowacka B.

Acta Scientiarum Polonorum. Hortorum Cultus

2002

tom 01

nr 2

93-103

Transplants of tomato cultivar ‘Recento F₁’ were grown under the fluorescent lamps emitted daylight, yellow, green, blue and white light with quantum irradiance on the apical bud level 57 µmol m⁻²·s⁻¹. The growth dynamic and the most important morphological attributes of the transplant were investigated. It was observed favourable influence of the blue light. Plants exposed to blue light flowered early, were short, with thick and strong stem, shortened internodes, enhanced participation of the dry mass in fresh mass. Yellow light influenced unfavourable. Plants grown under yellow light had delicate stem, small leaves, reduced fresh and dry mass and flowered late. Employment of the blue light emitted lamps can be an efficient method of the tomato transplant growth control.

Ograniczanie wyników

2 Acta Scientiarum Polonorum. Hortorum Cultus

1 Borowski E.

1 Glowacka B.

1 Hawrylak-Nowak B.

1 Michalek S.

1 2014

1 2002

Wyniki wyszukiwania

The response of lettuce to fluorescent light and led light relative to different nitrogen nutrition of plants

Wplyw barwy swiatla na wzrost rozsady pomidora [Lycopersicon esculentum Mill.]