This modelling approach simulates the peak viscosity of rice as function of air temperature perceived by the crop during the whole ripening period of rice. In particular this index is derived using a linear regression on the mean value of average air temperature occurring during the above mentioned phenological phase.

The general equation developed for Japonica varieties (Shen et al., 2007) is given below:

Where:

PV (Centipoise) is the peak viscosity of rice starch;

Tavg (°C) is the mean value of average air temperature that occurs during the entire ripening of rice;

ai, bi (unitless) are the coefficients of the equation, specific for medium and long grain Japonica varieties.

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