Potential thermal time

Thermal time accumulation is basic for the modelling of crop development, possibly adjusted for the effect of water stress, vernalization, and photo-period. It is computed with the following equations :

where GD d (°C ) is today's thermal time, CGD (°C-d ) is today's accumulated thermal time since planting, T b (°C) and Tc (°C) are the base and cut-off air temperatures that define the range of air temperatures for viable development, Topt (°C) is the optimum air temperature for development, T mean (°C ) is the mean daily air temperature, computed as :

where T max (°C) and T min (°C) are maximum and minimum daily air temperatures .

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