Seed potato coated with clay

Seed potato coated with clay
I saw a documentary once, in which a farmer in Turkey had coated seed potatoes in some kind of clay. This seed potatoes could be planted at anytime of the year, regardless of whether it was the rainy season or not. The seed would stay in the ground and would start germinating once the rain comes. And no chemical was required to spray at all. I am interested in this technology. Please, help me source this. Thanks.