All soils suffer from erosion but some are more vulnerable than others. Soils with dispersible subsoil?s, for example are subjected for serious erosion by tunneling and gully formation. Understanding the type of soil and how prone it is to erosion can help avoid problem in agriculture and on waterways and infrastructure.

Soil erosion removes valuable top soil which is the most productive part of the soil profile for agriculture purposes. The loss of the top soil results in lower yield and higher production loss.  When the top soil is gone, erosion can cause rills and gullies that makes the cultivation of the padlocks impossible.

1)Fertility loss and land degradation:

                  The direct and primary effect of soil erosion is soil loss and nutrient leaching resulting in reduction of land productivity. In Nepal, a soil loss of 20 tons/ha/year removes 300 kg of organic matter. 15 kg of Nitrogen, 20 kg of phosphorus and 40 kg of potassium.

2)Floods, landslides, and natural hazard:

There is an increasing trend of annual floods, causing damages of crops, property and lives in Nepal. Eventually, as the vicious circle of erosion proceeds, less water percolates into the soil to feed underground water supplies. Springs, marshes and streams dry up more quickly and, like this leads no further erosion. Large sum of money is spent every year on hills to keep the roads open in Nepal.

3)Pollution:

Sediment, as a pollutant has a two-fold effect on environment .it depletes the land resource form which it is entrained and deposited .it may also acts as scavenger, serving other pollutant, such as agriculture fertilizers and pesticides, from solution and depositing them in stream channels or reservoirs. Sediments is the greatest water pollutant by volume .it kills game fish by clogging their gills, and it covers their spawning beds. It interfere with water purification and sewage treatments. Sediment is one of the significant transport mechanism, for most of the nutrients and specially the N and P that gets into water. These added nutrients may increase aquatic productivity resulting in eutrophication. It may also carry pesticides, pathogenic bacteria from plant and animal wastes. 

4)Socio-economic consequences:

Soil and water losses and poverty are reciprocal in terms of cause and effect. A very popular proverb ?poor soil and poor people go together? also signifies the relation. There is another belief that ?more poverty and more improper reclamation will cause more soil erosion and again more soil erosion will cause more improper reclamation and more poverty.?

Man generally abuses his resources, natural or artificial, when to live under an adverse economic pressure. Sometimes the stimulus is provided by the emotion of greed. Such pressure and emotion are passed onto the land. Depletion and erosion are initiated. The cycle then becomes like spiral the greater the abuse, the greater the deterioration of resources, the lower the yields and the greater the poverty.

 Therefor soil erosion is directly related with environment .So we use the soil conservation method to protect environment.