Abstract: The feasibility of a new type of humidity sensor in plant ecophysiological studies was evaluated. The features and parameters, necessary facilities associated with the sensor, the calibration and the ways of applications were investigated. Solutions to practical measurements were provided, with Ferula krylovii as an example. The results showed that the new type of humidity sensor exhibited features of high sensitivity, rapid response, good linearity, longtime stability, low dependence on temperature, low cost, and was applicable for continuous recording. Consequently, this type of humidity sensor provides an alternative way to measure humidity and transpiration in addition to the photosynthesis meters for researchers and students without access to the expansive equipment of photosynthesis measurement.

Key words: agronomic characters., salt stress, yield, exogenous Ca²⁺, reactive oxygen