Question

Explain how human induces salinization develops:

Answer 1

human salinization is developed through: all irrigation water contains dissolved salts derived as it passed over and through the land, and rain water also contains some salts. Evaporation of water from the dry surface of the soil leaves the salts behind.
Salinization is especially likely to become a problem on poorly drained soils when the groundwater is within 3 m or less of the surface (depending on the soil type). In such cases, water rises to the surface by capillary action, rather than percolating down through the entire soil profile, and then evaporates from the soil surface.

Such thin soil conditions are a result of overuse of the soil that causes erosion and therefore a thinner topsoil layer.