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Manuring is done because of lack of specific nutrients in the soil humus.Manure also keeps the plant healthy and green.mixing manure with sandy soils helps to retain moisture levels. Adding manure to compacted soil helps loosen the soil. Manure produces increased soil carbon, which is an important source of energy that makes nutrients available to plants. Other benefits of manure include reduced runoff and leaching of nitrates in the soil.
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Manuring is done  to reduce the lack of nutrients present in the soil.while adding manures,we have to plough the land,that helps to increse the availability of soil, retentivity of water etc
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