According to the Roman Mythology, Picummus or Picumnus were the god of the growth.

Inter alia things, the Roman S allotted to him:

• fertilizing properties of the Manure.
• the protection of the new-born babies, with his brother Pilumnus.

It is also known under the name of Sterquilinus (or Stercutus or Sterculius). In Latin, Stercus = manure