growing degree days
approximates the growth process by the daily accumulated temperature higher than the base temperature.
symbols, variables and units
T_max, T_min, T_b: °C; single-day GDD: °C·d.
applicable conditions and boundaries
Simplified average temperature method; base temperature, upper and lower limits need to be defined according to the crop model.
formula source code
The following is a copyable LaTeX expression.
GDD=\max\left(0,\frac{T_{\max}+T_{\min}}2-T_b\right)Reference and Extended Learning
FAO Irrigation and Drainage Paper 56 ↗is organized according to model definition and assumptions. Please check actual conditions and original literature before engineering, research and clinical use.
growing degree daysaccumulated temperature