The Effects of Various LED Light Wavelengths to the Physiological and Morphological Parameters of Stevia (<i>Stevia rebaudiana</i>) Bertoni
In this study, it was investigated the growth of stevia (Stevia rebaudiana Bertoni) under various wavelengths of LED lamp (Light Emitting Diodes), which can emit daylight (cool white; 400â€“700 nm), red (620â€“630 nm) and blue (465â€“485 nm) wavelengths of the light in the electromagnetic spectrum. In all applications, quantity of PAR (photosynthetically active radiation) was adjusted as 150 Âµmol.m-2 s-1. Study had maintained in plant breeding cabin 16 hours light and 8 hours dark environment. Results demonstrated that while the highest plant height was determined in the â€œ30% blue light+ 70% red lightâ€ application, the highest stem length was found in the â€œ50% blue light + 50% red lightâ€ application. In addition, the number of the stems reached the highest value in the â€œ70% blue light + 30% red lightâ€ application. Consequently, a correlation was observed between negative â€œaâ€ value and the amount of chlorophyll. Because of the hereby obtained results, comparing to other applications, the â€œ50% blue light + 50% red lightâ€ was found as the best light application to obtain optimum yield values of stevia.
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