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http://dx.doi.org/10.7235/hort.2013.13011

Effects of Red, Blue, White, and Far-red LED Source on Growth Responses of Wasabia japonica Seedlings in Plant Factory  

Kim, Hae Ran (Warm-Temperature and Subtropical Forest Research Center, Korea Forest Research Institute)
You, Young Han (Department of Life Science, Kongju National University)
Publication Information
Horticultural Science & Technology / v.31, no.4, 2013 , pp. 415-422 More about this Journal
Abstract
This study was conducted to establish the optimum LED light source and quality for growth of Wasabia japonica seedlings in the LED chamber plant factory system. The light treatments were combined with four colors LED (red, blue, white, far-red), irradiation time ratio of the red and blue LED per minute(1:1, 2:1, 5:1, 10:1), and duty ratio of mixed light (100%, 99%, 97%). The growth response of W. japonica was the greatest in the R + B mixed light treatment, and seedlings grown in the red LED alone was higher than blue LED alone in the monochromic radiation treatments. In the R + B mixed LED, 1:1 ratio of R and B was the best for total biomass and tiller production. In mixed light treatments, the growth response of W. japonica was highest in the 100% duty ratio with R + B mixed light, while that was highest in the 97% duty ratio with R + B + W mixed light. Leaf area and dry weight were increased in the red light treatment alone, while specific leaf area was increased in the blue light alone. With the increasing red LED light ratio, leaf area and dry weight of W. japonica was significantly increased under the R + B mixed light treatment. In mixed light treatments, the leaf growth responses of W. japonica was highest in the 97% duty ratio with R+B mixed light, while that was highest in the 100% duty ratio with R + B + W mixed light. For cultivating W. japonica in a plant factory, treating red LED supplemented with a blue light or higher ratio of the red to blue LED was benefit to promote the growth of W. japonica.
Keywords
biomass; duty ratio; light quality; specific leaf area; wasabi;
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