Abstract
Modern porometers measure the rate at which water vapor diffuses out of [wheat] leaves. The stomatal resistance can be deduced directly from this measurement. However, the resistance will vary with the ambient gas in the porometer, and nitrous oxide was used in a porometer. In this paper calculations and experimental measurements of the stomatal resistance in nitrous oxide and in He are compared to that in air. The stomatal resistance measured in nitrous oxide can be converted to that in air by dividing by 1.3.

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