A Porometer for Laboratory and Field Operation

Abstract

A porometer is described which is easily and rapidly attached to plant leaves and appears to be a versatile and sensitive instrument for laboratory or field measurement of leaf resistance to air flow. In the laboratory it can be connected to a normal resistance porometer circuit, and in the field to a sphygrnomanometer. A theoretical relationship has been developed and tested which enables the conversion of leaf resistance obtained with a sphygmomanometer to that obtained with a normal porometer circuit.