We have just had a dam cleaned out. I had the machine operator spread the muck from the bottom of the dam along side the drive way where i plan to put our food forest. In theory it should be quite fertile with all the weed and muck that was mixed through it. It has however dried into solid clay with a lot of small rocks through it. Does anyone have any ideas on improving this soil so that it will be suitable to plant in? I am thinking that I should much it heavily and maybe plant some green manure crops, even sweet potato. What are your thoughts?