Mod Request - Dig-able rich soil

[KnewOne]

I feel like it should be possible to dig rich soil, leaving regular soil behind with the ability to place it in the other place. Is there any mod for that or i should just hope someone makes it ? :p

[mvargus]

Rainbeau has a mod "Fertile Fields" that allows extensive terraforming, including using fertilizer to turn regular soil into rich soil.