Growing Degree Days (GDD) is a simple model to relate the air
temperature to growth, is also useful in development of crops
and pests incidence. This is also useful in studying the
suitabil ity of a crop variety to a new environment. It is
calculated by deducting the base temperature from the mean
daily temperature [(Tmax+Tmin)/2].
Base temperature is the temperature below which no
physiological activity takes place. It is taken as default
•10°C from 2nd March to 31st October
•5°C from 1st November to 1st March.