The available modelling approach simulates this indicator as function of air temperature experienced by the rice crop during the whole ripening period. 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 both Indica and Japonica varieties (Yuan et al., 2008) is given below:

Where:

BV (Centipoise) is the breakdown viscosity of rice starch;

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

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

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