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Numerous factors contribute to soil pollution (e.g., household and industrial waste, fertilizers, pesticides).
Animal dung introduces large quantities of nitrate into the soil; the nitrate then filters into the water table.
Products that cannot be completely decomposed by living organisms.
Most nonbiodegradable soil pollutants are produced by industry, which discharges more than 700 different substances.
Pollution generated by an increase in household waste and detergent spilled into wastewater.
Some of it is treated in the same manner as household waste, while other forms containing toxic substances are processed at specialized sites.
It is composed mostly of biodegradable organic matter but also contains plastics, detergents, solvents and heavy metals.
Each waste layer is sealed using a plastic film or a base layer of clay.
In spite of the sealing of waste layers, rainwater runoff allows certain pollutants to seep into the subsoil.
It is used to destroy parasitic fungi on crops.
Product (insecticide, herbicide or fungicide) that destroys harmful organisms. It sometimes enters the food chain and affects flora and fauna.
It is used to destroy or limit the growth of plants harmful to crops.
The excessive use of fertilizers leads to an increased quantity of mineral compounds in the soil and in farmed crops.
It has developed with the intensification of agriculture and the large-scale use of fertilizers and pesticides.