Some articles advise trunk chopping in order to improve bonsai's style, for example, increase tapering. They say after trunk chopping new shoots will grow out of remaining stub, you have to choose dominant one and proceed to develop bonsai.
But in some book (non-bonsai specific) it is said that if tree is heavily damaged it gives new shoots on remaining parts of tree AND root shoots (shoots appearing from the ground, i don't know precisely how it would be in English).
So i decided to try. After i chopped 2/3 of trunk original length, no new buds opened on trunk, but it gave a plenty of root shoots.
And now I'm wondering how i can control appearance of shoots on trunk and from the ground. Tree was an elm.