This modelling approach simulates the amylose content of rice grain as function of growing degree days accumulated from flowering date, using a logarithmic equation. The amylose content computed at maturity is then multiplied by an average nitrogen stress factor which can decrease its potential value.

The general equation for Indica and Japonica ecotypes (Chen et al., 2011) is given below: 

   

Where:

AC (%) is the amylose content of rice kernel as percentage of grain dry weight (D.W.);

GDDFl (C° day-1) are the growing degree days accumulated from flowering date;

Nstress (unitless) is the average nitrogen stress factor computed during ripening period of rice crop;

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

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