Soil Pollution is one of the most threatening environmental hazards in terrestrial ecosystems, causing a broad spectrum of negative consequences that affect plants, animals, humans, and the ecosystem as a whole. The main causes of soil pollution include industrial wastes, overuse of fertilizers, pesticides and manures, plastic bags, and more. This article will explain to you the Causes of Soil Pollution which will be helpful in preparing the Environment syllabus for the UPSC Civil service exam.

Causes of Soil Pollution

What does "soil pollution" mean?

• Soil pollution is defined as the "adding of substances to the soil that have a negative impact on the physical, chemical, and biological aspects of the soil and lowers its productivity."
• It's a build-up of poisonous compounds, chemicals, salts, radioactive materials, or disease-causing agents in the soil that harm plant development and human and animal health.
• Soil naturally contains a few harmful chemicals.
• The amounts of contaminants found naturally in soil are not high enough to constitute a risk.
• Soil pollution can also be defined as when the levels of contaminants in soil surpass the levels that should be present naturally.

Causes of Soil Pollution

Industrial Wastes

• The untreated discharge of industrial pollutants into soil causes soil pollution.
• It contains a high level of hazardous pollutants, resulting in soil pollution.
• Industrial wastes contain varying amounts of harmful substances and dangerous compounds, which, when deposited in soil, influence the topsoil layer strength.
• As a result, they impair soil fertility and biological activity.

Fertilizers, pesticides, and manures

• Food demand has risen dramatically as the human and pet animal populations have grown.
• As a result, farmers frequently employ very toxic fertilizers and pesticides to clear their crops of insects, fungi, and bacteria.
• DDT, endosulfan, and heptachlor are examples of chlorohydrocarbons (CHCs) that accumulate in soil and produce biomagnification.
• However, over usage of these compounds causes contamination and poisoning of the environment.
• Many nations have prohibited some of these pesticides, such as DDT and endosulfan.

Other Causes

Plastics

• Plants, animals, and humans are all at risk from plastic waste. Only a small percentage of plastic is recycled, with the rest ending up in landfills.
• It takes 1000s of years to degrade, and even then, harmful compounds contaminate the land and water.
• Plastic bags build up in the soil and prevent seeds from germinating.
• When plastic is burned in landfills, highly toxic and dangerous gasses such as carbon monoxide, carbon dioxide, phosgene, dioxins, and other poisonous chlorinated compounds are released.
• After burning, toxic solid residue remains in the soil. Through chemical processes, hazardous gasses penetrate soils and severely pollute them.

Mining Activities

• The extraction of mineral resources in mining is usually accomplished by underground or open cast mining.
• As a result, the operations necessitate excavation, from which dust may fall.
• Since the dust is not limited to the area where mining activities took place, it pollutes the soil once it rises and settles to the ground.

Landfills

• Due to people's changing economic lifestyles, each home produces tonnes of garbage each year.
• Plastic, paper, textile, wood, and hospital waste gather in landfills.
• Items that cannot be recycled end up in landfills, causing pollution.
• Thus they serve as an important cause in polluting the soil.

Construction Activities

• A great number of construction operations are taking place as a result of urbanization.
• Large waste articles such as wood, metal, bricks, and plastic have resulted as a result of this.
• These are discarded on the outskirts of cities, polluting the soil and environment as a whole.

Microbeads

• Microbeads are solid plastic particles smaller than one millimeter in diameter.
• Polyethylene and other petrochemical plastics make up the majority of them.
• Personal care products, toothpastes, and health research projects all contain microbeads.
• These products when discarded cause harm to the soil by polluting them to a greater extent.
• Many nations, including Canada, Ireland, the Netherlands, and the United Kingdom, have prohibited the manufacture of microbead-containing products.

Impact of Soil Pollution

On the Environment

• Soil pollution is harmful to the ecosystem and has implications for all forms of life that come into contact with it.
• Unsustainable agriculture methods that deplete soil organic matter can allow toxins to enter the food chain more easily.
• For example, contaminated soil can discharge pollutants into groundwater, which accumulate in plant tissue and are subsequently passed on to grazing animals, birds, and humans that consume the plants and animals.

On the Soil

• A chain reaction occurs when soil pollution occurs.
• It affects soil biodiversity, lowers soil organic matter, and reduces soil filtering capacity.
• It also contaminates water held in the soil and groundwater, resulting in nutrient imbalances in the soil.

On Agriculture

• Soil pollution has an influence on food security because it impairs plant metabolism, lowering crop production.
• They make crops dangerous for animals and humans to eat.
• Pollutants also impair soil biodiversity and fertility by directly harming soil microbes and larger soil-dwelling species.
• Pollutants also impair soil biodiversity and fertility by directly harming soil microbes and larger soil-dwelling species.
• The soils' ability to cope with pollutants will also become too low.

On Human Health

• Pollutants in the soil, groundwater, and food supply can cause a wide range of diseases and deaths in humans.
• Short-term health effects from exposure to such soils include headaches, coughing, chest pain, nausea, and skin/eye irritation.
• Long-term exposure to contaminated soil can cause central nervous system depression, damage to essential organs (such as the liver) and even cancer.

Conclusion

Health risks from direct contact with contaminated soil, vapor from toxins, or secondary pollution of water supplies inside and beneath the soil are the main reasons for concern about soil contamination. Aside from the rare occasions where natural chemical accumulation results in soil pollution, natural processes may also have an impact on human-released hazardous chemicals in the soil, reducing or increasing pollutant toxicity and/or soil contamination levels. This is due to the complex soil environment, which includes the existence of other chemicals and natural circumstances that may interact with the pollutants produced.