Explanation:

Explanation:

• Saline soils are also known as Usara soils.
• Saline soils contain a larger proportion of sodium, potassium and magnesium, and thus, they are  infertile, and do not support any vegetative growth.
• They have more salts, largely because of dry climate and poor drainage. They occur in arid and semi-arid regions, and in waterlogged and swampy areas. Their structure ranges from sandy to loamy. They lack in nitrogen and calcium.
• Saline soils are more widespread in western Gujarat, deltas of the eastern coast and in the Sunderban areas of West Bengal.
• In the Rann of Kuchchh, the southwest monsoon brings salt particles and deposits there as a crust.
• Seawater intrusions in the deltas promote the occurrence of saline soils.
• In the areas of intensive cultivation with excessive use of irrigation, especially in the areas of green revolution, the fertile alluvial soils are becoming saline. Excessive irrigation with dry climatic conditions promotes capillary action, which results in the deposition of salt on the top layer of the soil.
• In such areas, especially in Punjab and Haryana, farmers are advised to add gypsum to solve the problem of salinity in the soil.