How can we prevent the loss of topsoil?

(N/A) The loss of topsoil can be prevented by adopting the following measures:
$(i)$ Intensive cropping: This practice ensures the field is not left unused by growing crops continuously.
$(ii)$ Terrace farming: This is practiced in hilly regions where small fields are formed in the shape of steps to grow crops,which reduces soil erosion.
$(iii)$ Afforestation and planting: Sowing grasses or planting trees on barren soil prevents it from being washed away.
$(iv)$ Proper drainage: Constructing drainage canals around the fields helps in the controlled removal of excess rainwater,preventing soil runoff.