Hi Jan, yes, there are some. I did not studied this topic much, I cannot recommend a direct paper, but this could be helpful for start:

https://www.researchgate.net/publication/263659014_Gods_of_Soil_Mythopedology

http://soil-research.com/sr/?p=165

some indian rituals of Mati (soil) are mentioned in this book:

https://books.google.cz/books?id=JC-014hKeKAC&dq=soil+deity&hl=cs&source=gbs_navlinks_s

some studies by Gregory Rettalack are mentioned here:

http://www.monbiot.com/2005/03/22/god-of-the-soil/

and maybe some info will be here (Ethnopedology issue of Geoderma):

http://www.sciencedirect.com/science/journal/00167061/111/3

This is very nice and interesting question, I will definitely follow it!

Sincerely

jh

Conference Paper Gods of Soil & Mythopedology