If an agricultural field is liberally irrigated for a prolonged period of time, it is likely to face problem of:

Irrigation without proper drainage of water leads to waterlogging in the soil. Waterlogging draws salt to the surface of the soil. The salt then is deposited as a thin crust on the land surface or starts collecting at the roots of the plants. This increased salt content is inimical to the growth of crops and is extremely damaging to agriculture.