Yellowing and browning leaves late flowering

This Gelat.OG is maybe 10 days from harvest. Is the leaf discoloring the plants normal practice of cannibalizing itself? Or this a deficiency?

A little of both yes

May need more than 10 days, I'd boost yer PK if u have anything

Do not give any more fert if you're going to harvest. you have to give time for that stuff to be used up. you don't want to consume nutrients.

No, nothing but PH'd water from now on. You might be right BobThe420builder. Knowing when to harvest is the biggest challenge for me. Seeing cloudy and/or Amber Trichomes isn't as straightforward as it seems. May I ask why you think I may be more than 10 days out?

In short yes. Its both. Deficiency and age. Im not one to flush so I advise to give some P & K.