Soil

Difference Between Sodicity and Salinity

Difference Between Sodicity and Salinity

While salinity can improve soil structure, it can also negatively affect plant growth and crop yields. Sodicity refers specifically to the amount of sodium present in irrigation water. Irrigating with water that has excess amounts of sodium can adversely impact soil structure, making plant growth difficult.

  1. What is the difference between soil salinity and soil Sodicity?
  2. What is saline and sodic soil?
  3. What is the difference between saline and alkaline soils?
  4. What causes Sodicity?
  5. Is soil salinity good or bad?
  6. Why is salinity a problem?
  7. What is meant by saline soil?
  8. What is the meaning of soil salinity?
  9. What is the best treatment for sodic soils?

What is the difference between soil salinity and soil Sodicity?

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

What is saline and sodic soil?

Soils that have both detrimental levels of neutral soluble salts (ECe > than 4 dS/m and a high proportion of sodium ions (ESP > than 15 or SAR > than 13) are classified as Saline-Sodic Soils. Plant growth in these soils can be adversely affected by both excess salts and excess sodium levels.

What is the difference between saline and alkaline soils?

Saline soils contain an excess of neutral soluble salts of chlorides and sulphates whereas sodic or alkali soils contain sodium carbonates/ sodium bicarbonates. They lack in nitrogen and calcium and have low water bearing capacity.

What causes Sodicity?

Sodicity is caused by the presence of sodium attached to clay in soil. A soil is considered sodic when the sodium reaches a concentration where it starts to affect soil structure. The sodium weakens the bonds between soil particles when wetted resulting in the clay swelling and often becoming detached.

Is soil salinity good or bad?

Soil salinity is an enormous problem for agriculture under irrigation. ... All soils contain some water-soluble salts. Plants absorb essential nutrients in the form of soluble salts, but excessive accumulation strongly suppresses the plant growth.

Why is salinity a problem?

If the level of salts in the soil water is too high, water may flow from the plant roots back into the soil. ... Salinity affects production in crops, pastures and trees by interfering with nitrogen uptake, reducing growth and stopping plant reproduction.

What is meant by saline soil?

By definition a saline soil is a nonsodic soil containing sufficient soluble salt to adversely affect the growth of most crop plants with a lower limit of electrical conductivity of the saturated extract (ECe) being 4 deciSiemens / meter (dS/m), which is equivalent to a value of 4 mmhos/cm.

What is the meaning of soil salinity?

Soil salinity is defined as high concentration of solute salts including Na+, Ca2+, and Mg2+ in soils, causing more than 4 dS/m for soil electric conductivity, which is comparable to 0.2 MPa of osmotic potential produced by 40 mM sodium chloride (NaCl) in the solution (Rengasamy, 2002).

What is the best treatment for sodic soils?

Sodic soils can be directly treated through the application of gypsum (particularly on the surface), which serves to replace the excess sodium in sodic soils with calcium. In southern Victoria, typical application rates of gypsum are around 2.5 t/ha and applied on a 3 to 5 year basis.

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