Quote Originally Posted by polishpollack
Leaf tip burn isn't usually caused by heat. It's too much nitrogen. The yellowing that shows on the upper leaves is mimics overfert but it's actually the same yellowing that is down below. In time, the rest of the leaves will turn yellow. If the leaf tips turn yellow, then brown, that's overfert. Let us know what happens after some dynagrow.
Yo polishpollack; have you ever used cal meg for the calcium problem?