Abstract
Water was artificially applied to the foliage of small potted ponderosa pine trees to determine the effect of wetting on transpiration rates. By means of unwetted control trees and a prediction equation, the transpiration of wetted trees could be estimated had they not been wetted. The difference between the estimated and actual transpiration was a measure of the transpiration reduction due to treatment. For thirty‐six 2‐hour periods the average transpiration reduction was 14%, or 9% of the applied water. Thus, about 91% of the applied water was a net loss to soil moisture supplies. The saving as a per cent of applied water varied from 4 to 14 and appeared to be weather related. Minimum values were generally observed on both cool, humid days and dry, hot, windy days. Higher savings were observed with more moderate weather. (Key words: Transpiration; interception; soil moisture)
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