ISHS Acta Horticulturae 418: III International Symposium on Artificial Lighting in Horticulture
RED/FAR-RED PHOTON FLUX RATIO USED AS AN INDEX NUMBER FOR MORPHOLOGICAL CONTROL OF PLANT GROWTH UNDER ARTIFICIAL LIGHTING CONDITIONS |
| Authors: | K. Murakami, I. Aiga, K. Horaguchi, M. Morita |
| Keywords: | phytochrome photoequilibrium, wave band, sunflower, metal halide lamp, fluorescent lamp |
| Abstract:
The red/far-red (R/FR) photon flux ratio is an important index of morphological control of plant growth. Both 600–700/700–800nm and 655–665/725–735nm have been used as definitions for R/FR. In our research, these two definitions were tested comparing the growth of sunflowers using 3-band+FR fluorescent lamps and metal halide lamps at the same of R/FR and photosynthetic photon flux density. The ratio, 600–700/700–800nm, was a better index for morphological characteristics. Plant shape and morphological characteristics were surprisingly similar in spite of the different spectral distributions. | |
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