Physiological studies of the growing process of broad bean plants IX On the characteristics and the variations of carbon dioxide exchange of leaves and pods

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Carbon dioxid concentration in the peach orchard was microclimaticlly measured. For the parpus of this measuring a Haldane gas analyser was used.Diurnal variation of carbon dioxide in the orchard:-This gas concentration was lower in the daytime than in the night-time and it increased rapidly after sunset. It is probable that this phenomenon was caused by more vigoron carbon assimilation than respiration in the daytime and by the fact that at night the former ceased and only the latter was carried out, and that more of this gas was released from the soil in the night-time than in the daytime.Distribution of carbon dioxide in the orchard:-Since it scarecely blows at night, the atmosphere where leaves were thicker and nearer to the ground surface contained more of this gas than at other parts in the orchard. In the early morning, the gas began to decrease gradually from part of the tree where sun fell. This phenomenon extended towards shady part of the tree as the sun rose high. And constant tendency was recognized during daytime when wind blew.
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