🌱 Plant Growth (GDD)

Base temperature (°C): 5 Mean daily temp (°C): 18 Temp amplitude (°C): 8 Soil moisture (0–1): 0.60 Daylength (hrs): 14

Phenological stages:

CropWheat

GDD/day—

Days to maturity—

Effective GDD—

Yield index—

Current stage—

Growing Degree Days
GDD = max(0, T_mean − T_base)
Each crop has a thermal sum requirement per stage. Moisture stress and short daylength reduce effective GDD accumulation.