Water loss caused by transpiration is significant, especially on a bright summer day. The utilization of precipitation as a water resource will be affected largely by transpiration. Thereupon, the investigation of the transpiration rate was carried out as a fundamental datum of water resources, using a wind tunnel which can maintain any meteorological condition. Various examinations on the potometer method were performed and the method was found satisfactory in our investigations. The transpiration rate obtained by the potometer agreed within ±2.pct with that of the potted plant. The following empirical formulas were obtained from the relation of the transpiration rate to radiation intensity and wind velocity for Myrica rubra.

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wind velocity water resources myrica radiation intensity transpiration rate meteorological potometer method potted

Yoshito Yamaoka,.Experimental studies on the relation between transpiration rate and meteorological elements. 39 (2),249-265.

Yoshito Yamaoka,"Experimental studies on the relation between transpiration rate and meteorological elements" 39

Yoshito Yamaoka,"Experimental studies on the relation between transpiration rate and meteorological elements"