I’m growing three in soil outside. All three have been in early flower for around three weeks. The lower leaves have started turning yellow earlier than usual. I never stopped giving N completely and for the past week the N has been gradually increased, yet the yellowing keeps moving upward. At the same time, flowering nutrients have been increased. I really do not want to give too much N at this point. Is this something I should continue trying to correct, or is it natural progression? I ordered some Epsom salts and they should arrive on Wednesday. I have a Bubba Kush, Amnesia Fast and a Peyote Forum. The PF is the most affected and has always been the one with less leafy bulk. Too me this looks like nitrogen fade deficiency yet may be a Magnesium issue. Any recommendations appreciated.