Problem with a rocky desert

Hello, first of all, I apologize for my English but I will try to write the best I can.

I have a problem and I would like to know if any of you know the solution, I am working in a rocky desert but I have the problem that the transition from the rocks to the soil sand is very direct, some time ago I found an image that represented my problem and I put a solution, but it is only half of the conversation and I do not know very well if you can still do this or how, I attached the image to understand what I mean, thanks.