What is Soil Salinity? Know about its Impacts & Causes

10 May, 2023

Soil salinity is the result of excessive deposition of water-soluble salts in lands. It negatively impacts the land quality and makes it infertile in the long run. Soil salinity affects the development of plants and crops and further leads to soil erosion if left untreated. Therefore, it lowers agricultural production and affects the farmer's economic well-being. However, taking measures to resolve it in the early stages is crucial to improve soil fertility.

So, this article about soil salinity will help you in understanding and provide information about.

- What is soil salinity?

- How to measure soil salinity?

- Reasons to prevent soil salinity?

- How to reduce soil salinity? - various solutions to overcome the situation.

What is soil salinity?

Soil salinity is the excessive amount of salt accumulation in soils and this excessive deposition of water-soluble salts in lands is known as the Salinization of soil. A commonly found salt is table salt NaCl. further, the list is far bigger and includes various compounds of sodium, potassium, calcium, magnesium, sulfates, chlorides, carbohydrates, and bicarbonates. In general, salt-affected lands are differentiated as saline, sodic, and saline-sodic, depending on the content of the salt deposits.

The major soil salinity effect on plant growth is issues related to water absorption. Even if there is sufficient soil moisture, crops wade and die due to the inability to take up enough water from the soil. 
Soil salinity normally happens naturally by mineral weathering or flood-prone areas or by improper farming practices. While some areas of land are initially saline due to low salt dissolution and removal.

 

Reasons for soil salinity - what are the causes of soil salinity?

- Soil salinity occurs due to dry climates and low precipitations when large amounts of salt deposits are not flushed from the lands.

- When there is a high evaporation rate in the atmosphere, the land fails to retain moisture which adds salts to the ground surface.

- Also, when poor drainage or waterlogging occurs, salts fail to pass and are not washed due to a lack of water transportation.

- Improper farming practices like irrigation with salt-rich water, which amplifies salt content in lands lead to worsening the condition of soil salinity.

- Also, the removal of deep-rooted vegetation and a raised water table as a consequence adds to the cause of soil degradation.

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- Moreover, leakage from geological deposits and their penetration into groundwater leads to excess deposition of content.

- When there is a rise in sea - level, the sea salts seep into lower lands and worsen the condition.

- Seawater submergence followed by salt evaporation is also one of the causes of soil salinity.

- Inappropriate application of fertilizers in farming leads to excess nitrification and thus accelerates soil salinity.​

 

Different Impacts of Soil Salinity

The impacts of soil salinity affect both ecology and human life. It induces soil degradation, affects crop production, induces the risk of floods & decreases terrestrial biodiversity. Moreover, it also has negative effects on below mentioned areas:

1. Agricultural production: When the level of salts in the soil water gets too high, water flows from the plant roots back into the soil. And this results in dehydration of the plant, leading to a decline in yield or even causing the death of the plant.
The salt tolerance of some crops relies on their ability to extract water from salinised soils.

Salinity affects crop productivity, pastures and trees by interfering with nitrogen uptake, lowering growth and slowing down plant reproduction.

2. Water Quality: The most important off-site impact of dryland salinity is the salinization of fresh rivers. This affects the quality of water for drinking and irrigation purposes with serious economic, social and environmental consequences for both rural and urban localities.

3. The ecological health of streams: Salt interacts with and affects in-stream biota (animals and plant species), changing the ecological health of streams and estuaries. The greatest threat and harm to biodiversity is the loss of habitat; both on land and inside water.

4. Terrestrial Biodiversity: Natural vegetation in salt-affected areas has been destroyed or damaged due to soil salinity. And this has caused major changes to the landscape and biodiversity. Moreover,  the destruction of remaining natural habitat in many agricultural areas/lands and the fragmentation of many wildlife corridors has also taken place because of increased salt concentration.

5. Soil Erosion: Dryland salinity further leads to other soil degradation issues, including soil erosion. Salinity is usually associated with prolonged wetness and lack of surface cover and therefore increases the chances of the vulnerability of soil to soil erosion.

6. Flood risk: Shallow water tables can heighten the risk of flooding. Soils in these conditions have limited capacity to absorb rainfall, resulting in high rates of run-off without absorption. Further, resulting in damage to roads, fences, dams, agricultural land and wetlands.

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7. Infrastructure and fixtures: Soil salinity results in major decreases in the lifespan of road pavements when groundwater levels rise to within 2 metres of the pavement surface.

The high Salt deposition also corrodes and destroys the properties of bitumen, concrete and brick structures. It also results in damage to infrastructure such as houses, roads, and playing fields in many cities and towns. Soil Salinity damage has also occurred to country roads and farm tracks and buildings.

8. Irrigation: Generally, all irrigation water contains some salts in it, which may remain on the soil surface or the leaves of plants after evaporation. Therefore, any irrigation system can deliver an increased amount of salt to the soil during the process.

 

What are the solutions to reduce soil salinity?

There are several techniques to reduce and prevent soil salinity problems and improve agricultural productivity:

- One should Increase drainage for better flushing to remove the salt deposit from the ground surface.

- You can grow salt-tolerant crops to manage economic risks and ensure land cover.

- Periodically remove salt crystals from the surface mechanically to prevent damage.

- Restore the balance in soils via chemical amendments like gypsum or sulfuric acid.

- Pre-treat seeds with NaCl to promote seed germination faster

- Reduce the process of evaporation with mulch or crop residue.

- Grow crops that can absorb better moisture to avoid prolonged wetness of lands.

- Use fertilizers rationally, as an overuse of certain chemicals can also promote soil salinity.​

 

Conclusion

Finally,  we have discussed all possible reasons, impacts, and solutions for soil salinity. So, now it must have cleared all your questions related to soil salinity and I hope you have got your questions covered. Always take preventive measures to protect your soil from soil degradation or soil erosion to get high agricultural productivity.

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