Why were turnips and clover grown by farmers in their farms ?

(i) Farmers discovered that planting these crops improved the fertility of
the soil.
(ii) Turnip was good fodder crop relished by cattle.
(iii) Farmers began cultivating these crops regularly and made them a part
of the cropping system.
(iv) Later, findings showed that these crops had the capacity to increase the
nitrogen content of the soil. Nitrogen is important for crop growth and
the land’s fertility is renewed.