Abstract
Amount and composition of internal atmosphere in the rice plant is measured (Table 1). Diurnal change of the composition of the gas in the base part of root, shown in Fig. 1, is found to be affected by the intensity of solar radiation (Fig. 2), soil temperature, and possibly the periodicity of cell division in the root. Seasonal change of the oxygen and carbon-dioxide percentage in the gas of the root seemes to suggest the trend of physiological activity of the root. The change of gas composition corresponds to the change of respiration rate of roots, reported in previous paper.
