Fertilizing year old trees


5 year old buck +
Last year I planted and tubed 50 oaks, when I planted them I added osmocote. This is the first time I have used the tubes, my question is should I fertilize them this year? and If I do what should I use? Thanks in advance.
I'm no expert, but what I have used for 1 year old hardwoods is a sprinkling of 10-10-10.