Effect of Light from LED Strip on Growth and Yield of Lettuce in Hydroponics

ผลของแสงจากหลอดไฟ LED แบบ Strip ต่อการเจริญเติบโต และผลผลิตของผักสลัดในระบบไฮโดรโปนิกส์

Abstract

        The objective of this research was to evaluate the effectiveness of commercial LED strip lights on the growth performance and yield of red oak and green oak lettuce in a hydroponic system. The experiment was investigated in a temperature-controlled room at 25±2°C for light 16 hours a day compared with outdoor cultivation. The experimental design was organized in a 5x2 factorial in a completely randomized design, factor 1 consisting of five types of LED light: 1) sunlight (Control), 2) white LEDs, 3) LED strip (red 3: blue 1), 4) LED strip (red 4: blue 1), and 5) LED strip (red 5: blue 1). Factor 2 included lettuce types such as 1) red oak, and 2) green oak. The plants were harvested 35 days after planting the seeds. The results revealed that red oak and green oak lettuce grown under LED light had significantly different numbers of leaves, plant height, and canopy width compared with sunlight (P<0.01). However, concerning yield, plants grown under sunlight exhibited significantly higher leaves with root fresh weight, leaf fresh weight, root fresh weight, leaf and root dry weights, and root length, compared to LED light. The red-to-blue ratio light was found to be that 3:1 tends to give more growth and yield than 4:1 and 5:1. It was observed that LED lights were not favorable to both red oak and green oak lettuce growth.