What is saline-sodic soils?

What is saline-sodic soils?

saline-sodic soil Soil that contains more that 15 per cent exchangeable sodium, a saturation extract with a conductivity of more than 4 mmhos/cm (25°C) and in the saturated soil usually has a pH of 8.5 or less. Either high concentration of salts or high pH, or both, interfere with the growth of most plants.

What is saline soil PDF?

Soil salinity is the salt content in the soil. Salts occur naturally within soils and water. The process of soils becoming salty is known as salinization or salination. Salination can be caused by natural processes such as mineral weathering or by the gradual withdrawal.

How would you reclaim sodic soil saline soil and sodic saline soil?

Sodic and saline-sodic soils are reclaimed by replacing the exchangeable sodium with calcium. This is commonly accomplished by adding gypsum, since it is relatively soluble and inexpensive.

Are saline and sodic soils the same?

Saline soils have excessive amounts of soluble salt, while sodic soils have high amounts of exchangeable sodium in the soil itself.

What crops grow well in sodic soil?

In the absence of good soil drainage in place combined with a high groundwater levels, late-maturing, deep- rooted and salt tolerant crops, like alfalfa, sugarbeet and sunflower can also be excellent choices which withstand moderate salt levels and take water from deeper depths (Franzen, 2007).

What is non saline sodic soil?

What is a sodic soil? A sodic soil is defined as a soil with an exchangeable sodium of greater than 6% of the cation exchange capacity. Non-saline sodic soils are usually dispersive in the presence of fresh water. Saline-sodic clays are less dispersive than non-saline-sodic soils and have higher infiltration rates.

Where do you find saline soils?

Saline soils are found throughout Colorado. These salts originate from the natural weathering of minerals or from fossil salt deposits left from ancient sea beds. Salts accumulate in the soil of arid climates as irrigation water or groundwater seepage evaporates, leaving minerals behind.

What is the pH of saline sodic soil?

between 7 and 8.5
Saline–sodic soils commonly have pH values between 7 and 8.5, whereas the pH of sodic soils exceeds 8.5.

What is reclamation of sodic soil?

Sodic soil reclamation generally involves the application and incorporation of gypsum into the soil followed by leaching. The rate of reclamation depends on the water intake rate.

How sodic soil is different from acidic soil?

If the extensive leaching of a saline-sodic soil occurs in the absence of any source of calcium or magnesium, part of the exchangeable sodium is gradually replaced by hydrogen. The resulting soil may be slightly acid with unstable structure. Such a soil is called degraded alkali or sodic soil.

How saline soil is formed?

In arid areas, saline soils are formed due to evapotranspiration and lack of rainfall to flush the soils. Finally, wind in coastal areas can blow moderate amounts of salts inland.

How can saline-sodic soil be improved?

In Saline–sodic soils reclamation involves the addition of good-quality water to remove excess soluble salts and the use of a Ca2+ source (CaSO4 2H2O or CaCl2) to exchange Na+ from the soil as a soluble salt, Na2SO4. In Saline–sodic soils a saltwater-dilution method is usually effective in reclamation.