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 general polynomial function proposed by developer (Morita 2005) for Japonica ecotypes is given below:

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, ci (unitless) are the coefficients of equation.

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