Irrigation Requirement (\( IR \)):

\[ IR = WR + FW - ER \]

Where:

• \( IR \) is the irrigation requirement, in millimeters per day (mm/day).
• \( WR \) is the water requirement, in millimeters per day (mm/day).
• \( FW \) is the farm waste, in millimeters per day (mm/day).
• \( ER \) is the effective rainfall, in millimeters per day (mm/day).