AsNoriuanswered grow question 4 years ago No. Your soil will become active and on time when your roots will reach it, plus extra feed could lead to overdose.
Water as many as you need. Go wider circle around your girl, for root to search for water, don't water just under her. Her size is the mirror of root zone aprox, so end of leave is your line, plus inch or two extra wide. That way you'll have really strong and healthy girl.
Good luck !