This is a great video on the making of biochar that works for the small operator. He walks you through it all.
Here is what i will add. We now have plenty of wood chips to work with. in fact i do think that every farm needs a chipper in order to reduce wood waste in general as it allows it to be easily piled up and protected from the weather while it also dries out uniformally. The larger pieces go to firewood of course or the saw mill if large enough.
The same process can be made much easier using a layer of dried chips staged in untill you have a drum full of hot coals and a layer of ash on top. As he does. i would start with straw and sticks as well to create space for the initial burn but follow up with a good layer of chips. when it starts to burn through dump in another layer. keep this up until you have it topping up.
His wetting process is sensible as well.
What i would add to all this is that i would then use a stamping pole on the coals in order to speed the crushing up of the carbon and reduce it it in size generally. I would go as far as to run it through a quarter inch mesh as well in order to reduce the rest as well.
Then i would also run an equal amount of dried earth as well through that mesh and then mix it with the char. This give you an easy to work with blend that is also easy to work in other manures and fertilizers as well without making it too strong.
Application is best through hills or into last stage transplanting pots. Learning to preserve locations for the next year is also advised. The nutriens actually accumulate in the biochar to steadily improve the soils
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