This model simulates the percentage of kernels characterized by immature base chalkiness as function of the average air temperature experienced by rice crop during the first twenty days after the heading. The algorithm proposed by developer (Kondo et al., 2006) was implemented considering four different parameterization based on two levels of grain susceptibility in both potential and nitrogen limiting conditions.

The general equation is:

Where:

WB (%) is the percentage incidence of white immature base grains on the dry mass of kernels;

tavg (°C) is the mean value of average air temperature occurring during the ripening period of rice;

ai, bi (unitless) are the coefficients of equation, assuming different values according to susceptibility and production level considered during simulations.

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