soil erosion in Iran
The removal of fertile topsoil by the action of wind, rain and river water is called soil erosion.
Soil erosion is the process of detachment of soil particles from the parent body or disturbance of the soil structure is known as soil erosion. Generally, soil erosion is called as the creeping death of the soil. Soil erosion is considered as negative soil pollution.
Causes of Soil Erosion:
Soil loss is maximum in the region with high population densities. Globally the present rate of soil erosion is over 2500 million tonnes/year. The chief causes of soil erosion are:
1. Land-use changes involving the destruction of forests and grasslands for expansion of agriculture and other commercial activities.
2. Overgrazing of pastures.
3. Fallowing of land for a longer duration.
4. Overuse of chemical fertilizers under intensive cultivation practices destroys the soil structure consequently the soil becomes susceptible to erosive forces.
5. Shifting cultivation by tribal population.
6. Continuous cultivation of the same crop.
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