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 Volume 6, Issue 6 (June 2019), Pages: 15-21


 Original Research Paper

 Title: Effect of three specific spectra of LED light on the growth, yield, and fruit quality of Sida tomato

 Author(s): Napat Watjanatepin *


 Faculty of Engineering and Architecture, Rajamangala University of Technology Suvarnabhumi, Nonthaburi, Thailand

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 * Corresponding Author. 

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The LED artificial light has been widely applied for greenhouse and indoor plantation. The artificial light generates sole red per blue (R:B) light ratio during plant cultivation from seedling through the fruiting period. The aim of this study is to investigate the fruit quality and the yield of Sida tomatoes under three specific spectra of LED light at different R:B ratios in comparison with the tomato yield and fruit quality under sole R:B light ratio. The experiments were divided into two groups. The 1st experimental group involved applying the LED light at R25:B75R for the seedling stage, R50:B50 for the vegetative growth, and R75:B25R for the fruit stage. The second experimental group involved applying the LED light at R63:B37 for the seedling, vegetative growth, and fruiting stages. Independent t-test was applied to determine the mean difference of the plant height, stem diameter, fruit yield, fruit weight, fruit size, and TSS. The experimental period was for 115 days. The results confirmed that the three specific spectra of LED light for each growth stage could promote the highest fruit weight, fruit yield, marketable fruit weight, and marketable fruit yield when compared to Sida tomatoes treated with one constant spectrum. Moreover, the level of total soluble sugar is also the highest. Sida tomatoes treated with three specific spectra of LED light has contributed to early and increased fruit yield. This method could be applied to produce high quality tomatoes and yield for the indoor plantation system. 

 © 2019 The Authors. Published by IASE.

 This is an open access article under the CC BY-NC-ND license (

 Keywords: Sole R:B light ratio, Fruit yield, Fruit quality, Specific spectrum of LED

 Article History: Received 4 January 2019, Received in revised form 28 March 2019, Accepted 31 March 2019


The authors wished to show gratitude for the research funding from the National Research Council of Thailand and Rajamangala University of Technology Suvarnabhumi in 2018 (Project code 607088). Finally, authors wished to show appreciation for Associate Prof. Kitti Boonlertnirun for offering advice and knowledge of the tomato plant’s growth, and Ponnapat and Pattaraporn in reviewing the English.

 Compliance with ethical standards

 Conflict of interest:  The authors declare that they have no conflict of interest.


 Watjanatepin N (2019). Effect of three specific spectra of LED light on the growth, yield, and fruit quality of Sida tomato. International Journal of Advanced and Applied Sciences, 6(6): 15-21

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 Table 1 


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