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Soil pollution is defined as the decrease in soil fertility because of the addition of some foreign elements. The soil is the most important component of the earth’s crust. The soil is polluted like air and water, but it remains restricted to the fields affected, unlike the air and water pollution.
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Industrial complexes discard millions of tons of solid wastes every year. The major sources of industrial pollutants are from pulp and paper mills, oil refineries, smelters, various chemical, power and heating plants. Almost all the industrial furnaces generate ‘fly ash’ which is added to the soil.
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Most of the waste is generated in the urban areas which include domestic, commercial and industrial waste. It is often dumped in public places, such as streets, parks, picnic areas, bus stops, near shops and in the open areas outside the city. These wastes include odd scraps, old newspapers, discarded papers, wooden furniture, lawn trimmings, glass, cans, old or broken appliances, tyres, plastics, etc. The accumulation of waste pollutes the soil. Several bacteria and virus germinate on the waste that enters the soil. Toxic acids are also produced from the heap of waste that leach down in the soil.
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Modern agriculture demands the use of a variety of chemicals in pursuit of high productivity. The fertilizers are used to increase the yield of crops. Other much-used chemicals include the herbicides, fungicides and pesticides.
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Waste from the hospital is called biomedical waste. It includes needles, syringes soiled dressings, expired drugs, cotton, anatomical parts, etc. These are often infected and is capable of spreading diseases. The untreated waste can mix with soil and pollute it.
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The biodegradable wastes break down and decompose in the soil. Micro-organisms like bacteria and fungi decompose the waste goods into simple compounds. These simple compounds are used as nutrients by other living organisms. The biodegradable wastes include peels of fruits and vegetables, leaves, grass, wood, paper, clothes, wool, etc.
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These wastes include those materials which do not break down or decompose in the soil. The important non-biodegradable waste is made up of plastic goods, polythene bags, synthetic clothes, metals, chemicals, glass, cans, radioactive waste, styrofoam, etc.
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The acid rains are the result of air pollution. Acid rains in turn cause soil pollution. Acid rains, pesticides and other biocides are serious soil pollutants. They kill the essential soil microorganisms and induce toxicity in the soil for plant growth.
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- Surface mining and strip mining remove top-soil and even subsoil. Sometimes, uncontrolled mine fires permanently destroy the productivity of the specific area.
- Industrial waste in most cases is very toxic and can pollute the soil. Presence of heavy metals in industrial waste is harmful to any soil which can be taken up by plants. Soil contaminated by heavy metals from agricultural and industrial waste will produce unhealthy food. Heavy metals enter the food chain and are consumed by human beings.
- Acid Rain kills the essential soil microorganisms and induces toxicity in the soil for plant growth.
- The Biomedical wastes are infected and are capable of spreading diseases.They play a huge role in polluting soil and spreading disease.
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Prevention of soil pollution mainly involves
- Judicious use of fertilizers, insecticides, pesticides, herbicides, fungicides, etc.
- An efficient system of disposal of domestic wastes.
- Restoring forests and grassland covers that check soil erosion, flood and waterlogging.
- Crop-rotation and mixed cropping also help to improve the fertility of the soil.
- Recycling and recovery of wastes.
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|All the solid wastes should be pretreated and recycled. Minimum quantities of such wastes should be discharged. Some important cases of recycling of wastes are given below:
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