Abstract
The effect of fluorine (HF) added to the culture solution at 0, 5, 10, 15, 20, 30 and 50 ppm on the growth of Oryza sativa L. cv. Koshihikari was investigated. The increase in the leaf number on the main culm, leaf length and number of stems per hill was depressed by fluorine added. Especially, the number of stems per hill was obviously decreased by increasing the concentration of HF. The photosynthetic rate of the rice leaves during 50 days after transplanting was markedly inhibited by 5 and 10 ppm HF added. The contents of chlorophyll in the leaves was decreased by 30 and 50 ppm HF. The number of ears and grains pet hill were also markedly decreased by the addition of HF. It was clarified that the dry weights of unhulled rice, leaves, stems and roots are markedly decreased by fluorine at a low concentration.
