Effect of light spectra on plants

Ali Tuten

Bachelor's thesis

Abstract:

This paper is a review on the effects of spectral quality (wavelengths of light) on plant growth and development. We report effects of photosynthetically active radiation (PAR 400-700 nm) divided into blue light, green light and red light. In a first part, plant responses to changing light spectra are examined for each light colour in the PAR region, including the varying effects of broad spectrum lights (combination of wavelengths) and monochromatic lights (single wavelength) on different species. The second part focuses on plant responses to radiation outside the PAR region. In this part we report effects of far-red light and ultraviolet light. While spectral quality describes the colours of light, plant responses are also altered with spectral intensity. We use photosynthetic photon flux density (PPFD) as a light intensity measurement unit for this paper and explore the effects of spectral quality at different PPFD. In a third part, we take a closer look to one species, Cannabis sativa. A plant which is most commonly grown in closed systems under artificial light.

Keywords

PAR, Photosynthetically Active Radiation, PPFD, Photosynthetic Photon Flux Density, BL, Blue Light

Jazyk práce: English

Datum vytvoření / odevzdání či podání práce: 3. 5. 2021

Obhajoba závěrečné práce

• Vedúci: doc. Ing. Pavel Klouček, Ph.D.

Czech University of Life Sciences Prague

Faculty of Agrobiology, Food and Natural Resources

Bachelor programme / odbor:
Agriculture and Food / Agriculture and Food