6 weeks into flower and I'm seeing this weird browning of the smaller new growth bud sites and some larger leaves as well?? I did flush and then I started to see this problem.. could it be (p) or (k) ?
It would help to see a full plant pic in natural light but I'm thinking its a late stage Mg deficiency but I would need full plant shots and other effected areas too in order to confirm for sure.
If you can try and focus your sight further down past the yellow/whiteish leaves on top you can see rust brown spots enveloping the lower leaf. Based on the pattern that they are showing and the appearance of the upper growth it most DEFINATELY has to be Mg.
But like I stated in my first post I need more pictures to give definitive clarification.