How can soil be conserved?

(N/A) Soil can be conserved through the following methods:
$1.$ Restoration of soil fertility:
$(a)$ By using an optimum amount of fertilizers and manures.
$(b)$ Practicing crop rotation.
$(c)$ Growing leguminous plants to fix nitrogen.
$(d)$ Leaving the field fallow for a period to allow natural recovery.
$2.$ Prevention of soil erosion:
$(a)$ Growing protective vegetation to cover the soil surface,which reduces the impact of rain and wind.
$(b)$ Practicing terrace farming in hilly regions to reduce the speed of water runoff.
$(c)$ Constructing embankments (bandhs) to prevent soil wash-off.