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Explain some harmful effects of agricultural practices on the environment.

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(a) Excessive use of fertilisers changes the chemistry of soil and kills useful microbes.
(b) Excessive use of non-biodegradable chemical pesticides leads to biological magnification.
(c) Extensive cropping causes loss of soil fertility.
(d) Excess use of ground water for agriculture lowers the water table.
(e) Damage to natural ecosystem/habitat.

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