Margaux Knox wrote:
In slow-draining clay soil, would biochar hold on to water in a bad way, making it drain even worse?
Additionally, do you turn the soil to work the biochar in? What about wood ash? I usually am timid with tilling lol. I prefer to chop-and-drop, mulch with compost, and not dig up too much if I can avoid it
Biochar is really amazing at breaking up heavy clay soil and it increases it's drainage enormously.
I don't have experience with using biochar in clay soil in a no-till setting but my advice in that case would be to use very fine biochar particles which can be watered into the soil.
If your biochar particles are bigger then you'll have to work it into the soil for it to have the most benefit.