First the bottom 2 leaves started to turn yellow. Few days after that, brown spots started to appear on the bottom leaves, I thought it might be sign of some soft of deficiency (calcium?) so I added some fertilizer -Miracle Grow-. The next day the lower most big leaves went all crunchy and curled up and brown as you can see on the photo. Is it definitely nut burn or could be other things? Some advice would be appriciated. Thx everyone