ISHS Acta Horticulturae 458: International Symposium on Water Quality & Quantity-Greenhouse
EFFECTS OF NUTRIENT CONCENTRATION UNDER VARYING RED/FAR-RED LIGHTING CONDITIONS ON THE CHLOROPHYLL CONTENT AND GROWTH OF TOMATO |
| Authors: | K. Murakami, I.-K. Sung, Y. Takemura |
| Keywords: | covering material, Lycopersicon esculentum, natural radiation, photomorphogenesis, spectral characteristics |
| Abstract:
Changes in the chlorophyll content of tomato leaves according to the changes in the red/far-red photon flux ratio (R/FR ratio) of lighting conditions was determined. It was also studied whether the reduction of chlorophyll content in a low R/FR ratio treatment can be changed by increasing the nutrient concentration. The experiment was performed at the nutrient concentrations of 0.25, 0.5, 1.0 (standard), 2.0 and 4.0 times. The R/FR ratios were 0.67, 1.11, 1.26, 1.50 and 2.20. The top fresh weight was highest with a R/FR=0.67 and at standered nutrient concentration. When the nutrient concentration was increased, the R/FR=1.11 treatment (near the natural radiation) produced the heaviest fresh weight. The chlorophyll content increased according to the nutrient concentration increased. The chlorophyll A and B content was always lowest at the R/FR=0.67 treatment at almost all nutrient concentrations. It was concluded that the reduction in chlorophyll content which occurred at low R/FR ratios could be improved by increasing the nutrient concentration. | |
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