Never folair your plants. If its nute burn it may not be from not from the roots. Leaves are not the same as roots and why companies tell you to folair is beyond me. Nitrogen for instance has to be converted from organic form to inorganic form to be useable to the plants. This is done with microorganisms and oxygen under the soil. Leaves are not ment to take in nutrients and mostly what it does is burns them. I would spray her down with water to wash that junk off.
One love
c