Which term refers to the buildup of salts in soils due to irrigation and evaporation?

• A. Soil salinization
• B. Pollution
• C. Desertification
• D. Deforestation

Answer: (A)

Soil salinization is the buildup of salts in soil caused by irrigation and evaporation. When irrigation water brings minerals into the root zone and water then evaporates, those salts are left behind near the surface. If drainage is poor, there isn’t enough water moving salts deeper, so salinity accumulates over time. This higher salt level lowers the soil’s ability to take up water, stressing or harming crops and reducing yields. You might even notice a white crust on the soil surface as salts crystallize. Management focuses on moving salts below the root zone through proper drainage and leaching, using higher-quality irrigation water, or adopting salt-tolerant crops.

Other terms describe different issues: pollution is about broad environmental contamination, desertification is the broader loss of productive land leading to desert-like conditions, and deforestation is the removal of forests—none of these specifically capture the process of salts building up in soils from irrigation and evaporation.