Evapotranspiration Rate (\( ET \)):

For Vegetative Stage:

\[ ET = 0.8 E + 0.5 \]

For Reproductive Stage:

\[ ET = 0.9 E + 0.5 \]

Where:

• \( ET \) is the evapotranspiration rate, in millimeters per day (mm/day).
• \( E \) is the pan evaporation, in millimeters per day (mm/day).