The Development of Covering Materials to Control Plant Growth by Changing the Red/Far-Red Photon Flux Ratio of Natural Radiation. (1). Design of Materials.:—Desing of Materials—

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Dyestuffs, which have the particular characteristics of being able to intercept the red (R) or far-red (FR) region, were added to clear PMMA (poly-methyl methacrylate) covering materials. Adjusting the R/FR photon flux ratio of natural radiation, these covering materials, to control the elongation of plant growth, were trial-produced. Increasing the concentration of dyestuffs, the R or FR areas are gradually largely intercepted. When a photosynthetic photon flux transmittance of 75% was decided on, R/FR ratios adjusted by these dyestuffs were calculated at 0.55 and 2.1 while that of CIE standard illuminant D<SUB>65</SUB> is 1.08. Two kinds of colored plastic panes of PMMA materials were produced by mixing dyestuffs into clear PMMA of 93% transmittance. The PPF transmittance of produced PMMA named R-interceptor and FR-interceptor was 69% and 70%, respectively. The R/FR ratio of R-interceptor and FR-interceptor was 0.55 and 1.57, respectively. These materials, which are able to control plant photomorphogenesis by adjusting R/FR ratio under natural radiation could be used effectively as special covering materials for horticultural plant production.
日本生物環境工学会の論文