Question

which crops are sown to increase the natural fertilityof soil​

Answer 1

Leguminous crops such as peas are grown in order to increase natural fertility of the soil.

Answer 2

The system is practiced where land is limited and farmers rely on little or no external soil enhancing materials to improve the soil fertility status. Examples of cover crops: Mucuna pruriens, Dolicus lablab Canavalia ensiformis. Sometimes edible cover crops such as the creeping types of cowpea are used.