There are many potential causes of soil pollution. Industrial chemicals, lead contamination, radioactive metals, leaking underground fuel tanks, improper disposal of hazardous materials, agricultural chemicals, salts, sewage, all are among the causes of modern soil pollution. It can even be caused by natural sources. Each of these different types of soil pollution causes a wide variety of harmful environmental effects. If you are considering buying a home, get your soil tested to make sure there are no problems in the land itself.
Nutrients added to the soil by agricultural interests to increase crop yields pose one of the largest sources of soil pollution, according to sources at the University of Minnesota. Rain can wash these nutrients out of the soil into lakes and ponds. There they promote the growth of algae and other harmful plants. They increase microbe levels, and reduce the oxygen content of the whole body of water. On land, fertilizer-based soil pollution causes a wide variety of problems due to poisoning, such as burned roots, stunted growth, and mineral deficiencies.
Salinization of the soil is a common pollution problem caused by irrigation in arid and semi-arid climates. This irrigation causes salts to build up in the soil. This eventually makes the soil unable to grow most crops. Salts are very difficult to remove from soil, so this is a pernicious problem.
Soil pollutants eventually leach their way through the soil and into groundwater. This pollutes local water sources, including wells and springs.
Radioactive heavy metals such as uranium, radium and plutonium pollute the soil in some places, either naturally or because of human activity. Other heavy metals, such as lead, mercury, arsenic, and chromium rise to dangerous concentrations in the soil as a result of mining activities, industrial activity, and automobile use. These metals in the soil can cause plant fertility problems, and many of them, such as lead and arsenic, are poisonous to animals and people. The radioactive metals also cause damage to the chromosomes of animals and people, leading to mutations, cancer, and a variety of other problems.
Pesticides also cause soil pollution. They can poison plants. They can decrease the fertility of the soil, making it less able tosupport plant life. They also can cause toxic reactions in people and animals.