I do believe in foliar feeding. Especially the yamadori trees with less roots gain from it.
Even spruce do benefit from certain products. Also a gift of magnesium to buxus has great results.
A lot of study’s and essay’s of leading agricultural university’s in Europe (Wageningen UR (Holland)...
With respect mr. Pall it is: Quod erat demonstrandum. Like bonsai the language is old enough to quote it right. And yes reading things like this is better than watching television.
If you are starting a discussion like this you must sure you compare appels with appels. Not a field grown tree...