Answer:
Manures are rich in
organic matter but are poor in nutrients. For this reason the cultivated field
supplied with only manures may suffer from deficiency of nutrients which will
automatically result in poor yield whereas fertilisers are inorganic compounds
and fulfil nutrient requirement of soil. So, the field which is supplied with
fertilisers only may face drainage problem and waterlogging due to lack of
organic matter in the soil which will bring harm to the crop and the yield.
Moreover, the use of fertilisers over long periods of time can destroy the soil
structure by killing the soil microorganisms that recycle nutrients in the
soil.
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