One Last Push for Apple Seedlings, Late Summer Feeding

It's late August and I'm trying to push the apple seedlings from my apple breeding project to grow just a little more before fall.  So, they get a dose of liquid gold and some water.  September is generally very warm here.   It may be too late for them to really grow much more because of day length and plant hormones and stuff like that, I wouldn't know, but if so, that's okay, I'll just have well fed plants in the spring.  In fact, it might not be a bad idea to do some fall fertilizing too, just for that reason...