Prolonged liberal irrigation of agricultural fields is likely to create the problem of :

Prolonged liberal irrigation of agricultural fields can lead to an increase in the salt concentration in the soil due to the evaporation of water, leaving behind salts. This process is known as salinization. Over time, high salt concentrations can make the soil less suitable for plant growth, reducing crop yields and affecting soil fertility. Therefore, the correct answer is option (D) salinity. Think of it this way: excessive irrigation can lead to the accumulation of salts in the soil, which can have detrimental effects on plant growth and soil health.