Correct Answer: Use of synthetic fertilisers

Solution : The correct answer is the Use of synthetic fertilisers .

Organic farming is the agricultural practice in which crops are grown without any chemical fertiliser or pesticides. It is a sustainable agricultural practice in which less organic compost, green manure, etc are used. It uses less nutrients from soil, and the soil is nurtured for future use by maintaining micro-organisms. Organic farming was first introduced by Sir Albert Howard, F. H. King, Rudolf Steiner and others.