Abstract
In this article, effect of cyan (≈500 nm) light on the plant growth as a supplementary light source to common deep red (≈660 nm) and royal blue (≈440) lights is examined. For this purpose, a 4-floor shelf was prepared containing Vernalia type iceberg lettuce (Lactuca sativa) seeds. Carbon dioxide content of air, soil moisture, air humidity, environment temperature, water, pH, electrical conductivity, fertilizer and nutrient contents were controlled at desired values; being same for the whole system. Second and third floors were lighted 18 hours a day, with the same photosynthetic photon flux density (PPFD) of 360 μmol m -2 s -1 . Third floor’s lighting was composed of 65% deep red and 35% royal blue lights. Second floor’s lighting was composed of 55% deep red, 25% royal blue and 20% cyan lights. First floor was lighted with sunlight, in order to make a comparison with natural lighting. Fourth floor contained the necessary control equipment. The experiment lasted for 15 days to analyse only the seedling period. The experiment results showed that, addition of cyan light to conventional red and blue grow lightings allowed the plants to grow 14% more by stem system. Also, cyan light provided a stronger root development and higher leaf area; which would indicate a higher product yield in the vegetative period. Keywords: Cyan light, artificial lighting, plant growth conditions, seedling period, lettuce, greenhouse efficiency, green light DOI : 10.7176/JBAH/9-10-11 Publication date :May 31 st 2019
Highlights
Food requirement of the world is highly increasing, with the growing population under favour of new medical technologies and better life conditions
The experiment continued for 15 days, which considered as seedling period, with the aforementioned germination and development conditions
Shoot length in second floor and third floor setups were observed much higher than sunlight setup in Figure 28; but as can be confirmed from Table 2, daily plant elongation for sunlight setup was dramatically higher than www.iiste.org second and third setups for the first week
Summary
Food requirement of the world is highly increasing, with the growing population under favour of new medical technologies and better life conditions. Healthy and efficient agriculture will be even more important to meet the growing requirement. One of the key instruments to agricultural efficiency and health is to provide accurate lighting to the plants. According to researches on plant growth, it seems possible to create an optimal lighting environment using LEDs [1]. McCree [2] examined the light absorptance property of 22 different plants. The mean values of light absorptance of these plants are tabulated as below: Light Wavelength
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