The following data were noted from an irrigation field:
1. Field capacity = 20%
2. Permanent wilting point = 10%
3. Permissible depletion of available soil moisture = 50%
4. Dry unit weight of soil = 15 kN / m3
5. Effective rainfall = 50 mm
The net irrigation requirement per metre depth of soil will be1
75 mm
2
125 mm
3
50 mm
4
25 mm