Question

why do farmers use different cropping patterns​

Answer 1

different cropping patterns are used by the farmers to make the soil fertile and get high yield also

Answer 2

This implies that any change in cropping pattern would indicate (1) a change in proportion of land under different crops (2) a change in time and space sequence of the crops. If more than one crop are grown in succession within a year on a field, it's called multiple cropping