Kor watering in irrigation is defined as:

💧 Concepts
→ A term Kor watering is used to describe the watering given to a crop when the plants are still young. It is usually the maximum single watering required when the crop is about 3 centimeters, with other watering done at usual intervals.

📌 Other Important Definitions

Kor demand means the maximum water required to grow crops during the entire crop period in a particular crop season. The design capacity of an irrigation canal generally depends on the water demand or water requirements of a crop season.
Kor period: The period during which Kor watering is done is called the Kor period.
Kor Depth: The depth of water applied during Kor watering is called Kor depth.
The relationship between Kor periods (B in days), Kor depth (Δ in m), and Kor demand (D in ha/m3/s) can be expressed as:
D = 8.64 * B * Δ
Delta: The total depth of water required to raise a crop over a unit area of land is called delta.
Duty of water: The term duty means the area of land that can be irrigated with a unit volume of irrigation water. Quantitatively, duty is defined as the area of land expressed in hectares that can be irrigated with unit discharge (1 cumec) flowing throughout the base period (expressed in days).