In North Indian Plains, optimum depth of kor watering for wheat, is A. 23.0 cm B. 19.0 cm C. 17.5 cm D. 13.5 cm

Option A: 23.0 cm is too deep for kor watering. This would cause the roots of the plant to rot.

Option B: 19.0 cm is too deep for kor watering. This would cause the roots of the plant to rot.

Option C: 17.5 cm is the optimum depth for kor watering. This will allow the water to reach the roots of the plant without damaging them.

Option D: 13.5 cm is too shallow for kor watering. This will not allow the water to reach the roots of the plant.