Abstract: The purpose of this study was to examine the effect of frequency on electrical parameters of peach fruits. The electrical impedance properties of nectarine ‘Qinguang 2’, including fourteen electrical parameters, were investigated using HIOKI 3532-50 LCR HiTester. Nonlinear curve fitting using SPSS resulted in the establishment of mathematical models which depict the quantitative relationships between these parameters and frequency. All these parameters with the exception of Q factor presented regular changes with increasing frequency while an inverse cubic correlation with frequency was observed on impedance (Z), equivalent serial resistance (Rs), equivalent parallel resistance (Rp) and reactance (X). Equivalent serial capacity (Cs) showed a similar pattern to that of equivalent parallel capacity (Cp).The change in impedance phase angle (θ) with frequency was a U-shaped curve while a W-shaped curve was observed for loss coefficient (D). Electrical excitation frequency admittance (Y), susceptance (B), equivalent series inductance (Ls), parallel equivalent inductance (Lp) and conductance (G) presented an exponential increase with excitation frequency.

Key words: peach, electric parameters, frequency characteristics