This model simulates the percentage occurrence of milky white grains on the total dry mass of rice kernels considering the assimilates supply to single grain characterizing the whole ripening period. In particular the model formalized by developers (Tsukaguchi et al. 2008) consists in an equilateral hyperbola which assumes two different parameterizations based on mean value of average temperature experienced from the crop during the ripening phase.

The general equation is:

Where:

MW (%) is the percentage incidence of milky white grains on the dry mass of kernels;

AS (mg grain-1 day-1) is the single grain carbon assimilates supply that occurs during the ripening period;

tb (°C) is the threshold of average temperature beyond which the damage to grain begins to occurs;

ti (°C) is daily average air temperature occurring during the ripening period of rice.

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