Question

why does farmers normally use a mixture of manure and fertilizers in their field

Answer 1

so that manures work effectively in presence of strong fertilisers and combined effect of manures and fertilisers is very effective

Answer 2

for the healthy growth of the crops.
manure and fertilizres makes the soil fertile(the soil that contain all types of nutrients).
they make the soil nutrient rich, which is helpful for the healthy growth of crops.

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