Question

give reasons why farmers normally use a mixture of manure and fertilizers in the field​

Answer 1

Fertilisers supply specific type of nutrients for the plant. Fertilisers are the chemicals which add minerals like potassium, phosphorus and nitrates to the soil. They use manure because it is a cheap fertilizer, plus they need somewhere for it to go anyways.Fertilizers are used because they increase crop production.
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Answer 2

farmers used it for making the crops clean n fertile in field ..He cant keep the crops as it is and give it to eat.. First the fertilization should take place to keep the crops clean.. this is why there is a mixture of manure n fertilizers in a fields