Effect of different spectra and light intensities of LED lamps on the growth and development of tomato seedlings
DOI:
https://doi.org/10.24215/16699513e147Keywords:
artificial illumination, light intensity, radiation spectrum, seedling production, Solanum lycopersicum L.Abstract
Seedling quality in horticultural species influences crop yield and quality after transplanting. Artificial light generated by light-emitting diodes (LED) makes it possible to produce seedlings out of season and in vertical farm systems. The composition of the radiation spectrum and the intensity provided are determining factors during the production cycle. The trial conducted between August and September 2021 in a cultivation module without external light located in Luján de Cuyo, Mendoza, evaluated the effect of three light compositions obtained by varying the proportions of wavelengths (red, blue, green, violet, and far red); and three levels of light intensity (240, 160, 90 µmol.m-2.s-1), on the growth and quality of tomato seedlings. Seedling biomass did not differ for the different spectra evaluated, while the highest light intensity generated a higher yield in total fresh and dry weight. Root biomass showed a decreasing trend with decreasing light intensity and greater seedling height was obtained in the treatments with 240 and 90 µmol.m-2.s-1. An increase in the Relative Chlorophyll Index was verified in the treatments with a higher proportion of blue light, while the intensities of 240 and 160 µmol.m-2.s-1, generated significantly higher values. This study establishes a basis for future research focused on the optimization of light resources in seedling production.
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