I've been busy working on other stuff leading into the holidays and the end of our farmer's market season but here's an update on the hugel process and progress. Linear progression had run into the old pile of subsoil from earlier activities and I have tried to document how I go about mixing and refining our raw clay into something I feel satisfied with going into service building long term fertility. The first images show the clay subsoil moving from the pile by the broadfork at the upper left to the shallow pit being used for mixing. When working with sticky clay like this it's nice to have a "hoe scraper" like the one pictured that I carved out of cherry years ago, simple but handy item for this scenario. Once the clay is in the mixing site I begin layering in other materials to work into it. This can be all kinds of types of organic or inorganic materials but here I'm using unsifted but mostly broke down woodchips for the bulk of it. I have at various times used compost, topsoil, sawdust, coffee grounds, spent mushroom substrates, vermiculite, punky wood, silt, leafmold, etc etc in whatever combination comes to hand. I am also adding ashes from the woodstove and crushed eggshells. Most importantly to me I add lots of ground charcoal. The picture strip represents the pathway it moves from my goodly sized charcoal burning pit to the the two IBC totes with their tops cut off where it is charged and then to the sink garbage disposal I used to reduce it in size. The sink grinder is a bit of a bottleneck but I actually like the slurry that results and have developed myriad techniques that take advantage of it's ability to flow. After many years of abuse the disposal finally called it quits shortly after this photo and I had to seek out a cheap replacement. The old one was a 3/4HP and my new one is a 1HP, they can chew through most things they encounter including small rocks but do not like chunks of uncarbonized hardwood or any kind of metal. I tried a 1/2HP unit at one time and it did not have what it takes for this job. After a couple buckets full of ground charcoal is added to the pit I leave it to sit and reach the right moisture level for shovel mixing. I should probably try to make video of this procedure at some point but the next pictures attempt to show the repeated process of turning the pile a bit then smacking it with the back of the shovel while drawing it back towards me. This folds, crushes, and smears the various ingredients together quite effectively in a short while. If I didn't have a convenient pit then this works great with tarp mixing, or small quantities in a trug. While still mostly clay it will become loose and crumbly. Ready to go back to the garden so life and soil processes can take it even further. I charged this charcoal prior to use but I will also be diverting plenty of urine to the ongoing build.
As far as wood sources go I have started breaking down and working with this large pecan tree that fell about two years ago. Notice the oyster mushrooms on some logs. I think I will set those aside for outer scaffolding on the bed.
Lastly, some photos of where the project stands at this moment from various angles. Still just the first section but growing upward. New mix in the the pit. One more round of subsoil to amend after that and the footprint of the bed and continue on.