I biocharred my mulberries last year. Yes, that is a verb. As I often have found, the tree starts doing really well the next year after biocharring. The mulberries have never been as good as this year, and it's hard to think that the weather has been unusually great this year. I realize that it is just an n of 1, but it is still exciting to think of yet another tree improving greatly after biocharring.
For mulberry what qualities are you rating?
As you know I like experimenting too. In my case a pair of 'lydecker' plums on similar rootstocks. One had perfect weather conditions due to being under glass and the other next to it wasn't. You will remember this, the trip to a Seattle botanical garden during nanking plum flowering. I spread pollen from several these purebreed nankings to the dry Lydecker plum, to which most are shown here, and the introduction of the same pollen that was spread to the unprotected partner refuted to crop.
I know your reason to experiment with biochar, but obviously wonder if in theory it's supposed to aid productivity as the purpose of your experiment?
Yes, productivity, flavor, overall satisfaction of eating the berries. It's not terribly scientific, but I will be very interested to see over the years if it holds up.