In citrus cultivation, there are problems concerning the quality of fruit, stability of production, and training of new bearers. To solve such problems, cultivating fruits and trees in optimum water conditions as well as saving labor, reducing costs by using precise diagnostic tools. In this research, which has already been practically applied in nondestructive measurement, the leaf water potential was estimated as an index of water stress. A correlation was found between near infrared spectroscopy and leaf water potential, and furthermore, accurate calibration models were obtained. These models were used to estimate the leaf water potential with ranges of about -0.6±0.3 MPa and -1.8±1.0 MPa.
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