Well you need to look at both some issues show up in new growth and some show first in the older growth. That is one of the clues our deficiency experts look at to try and narrow down the issue. Problems with mobile nutes show first in the older leaves because the plant is robbing them to support new growth. Deficiencies of immobile elements show first in the new growth as does nute burn
That makes complete sense, thanks. The more time I spend with them the more I learn from them as I do here.
Keep growing, keep learning, keep healthy.