Some observations on the relation between transpiration and soil moisture.

Transpiration rates of Phaseolus vulgaris were measured in pot experiments, at different soil moisture levels and light intensities. Transpiration increased with available moisture, becoming nearly constant at the higher levels. At the highest light intensity transpiration increased with available moisture content to a maximum at 16% moisture, but then showed a slight decrease; it is suggested that this effect is a result of O2 deficiency at high moisture levels.-Inst. Land Water Management Res., Wageningen. (Abstract retrieved from CAB Abstracts by CABI’s permission)