Effects of color led light intensities and different photoperiod regimes on growth of hydroponic lettuce (Latuca sativa L.)

Vo Thi Bich Thuy , Tran Thi Ba , Phan Ngoc Nhi * , Pham Ngoc Long , Tong Thi Sa Non and Le Vinh Thuc

* Corresponding author (phanngocnhi1989@gmail.com)

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Received: 18 Aug 2015
Revised: 19 Oct 2015
Accepted: 19 Feb 2016
Published: 28 Feb 2016
DOI: 10.22144/ctu.jen.2016.008
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Vo, T. B. T., Tran, T. B., Phan, N. N., Pham, N. L., Tong, T. S. N., & Le, V. T. (2016). Effects of color led light intensities and different photoperiod regimes on growth of hydroponic lettuce (Latuca sativa L.). CTU Journal of Innovation and Sustainable Development , (02), 1-7. https://doi.org/10.22144/ctu.jen.2016.008
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No. 02 (2016)

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Abstract

In this study, we examined the effect of lightintensity and light cycle on the growth of hydroponic leaf lettuce. Four light intensity treatment were using included 1 LED light NCM 3000K – purple LED: 75% red, 25% blue (48 μmol.m-2.s-1 PPFD - Photosynthetic photon flux  density); 2 LED lights NCM 3000K – purple LED: 75% red, 25% blue (80 μmol.m-2.s-1  PPFD); 3 LED lights D NCM01 L/30W – White LED (60 μmol.m-2.s-1 PPFD) and 3 LED lights NCM 3000K – purple LED: 75% red, 25% blue (115 μmol·.m-2.s-1  PPFD), with a combination of fivelight cycles 6/18, 9/15, 12/12, 18/6, 24/0 (light/dark). The result showed thatthe combination of 80-24/0 (2 purple LEDs – 24 hours light /0 hour dark) resulted highest fresh weight (34.93 g) and the seconds highest in the 60-24/0 (3 whiteLEDs -24 hours light /0 hour dark) and 80-18/6 (2 purple LEDs – 18 hours light /6 hour dark) treatment (28.95 and 27.22 g), while control 2 treatment (grown under sunlight) was 11.62 g. The main stem was highest at combined of 3 white LEDs with 24/0 and 18/6 treatments (26.18 and 20.04, respectively), while the numer of leaves (17.60 and 16.38 leaves), leaf length (10.31 and 10.97 cm) and leaf width (9.91 and 7.36 cm)at combined treatment of 2 purple LEDs with 18/6  and 24/0 were higher than most of anothers.The combination of 18/6 and 24/0 with 2 and 3 purple LEDs showed highest Chlorophyll value (3.92-4.75 µg/g), lowest at combination of 6/18 with four different light intensity (1.25-1.40 µg/g).
Keywords: LED light, Light intensity, Light cycle, leaf letture

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