nitrogen?

Hi ,Would like some advice please. This is my first grow and on day 49 from seed. Around day 40 one of my Fast n Vast auto’s and Critical Mass auto’s suddenly started yellowing heavily at the bottom (both had started flowering) and dropped a tonne of leaves. They are grown in plagron light mix...

dearest doctors of the bud..... Oooh, I'm in a pickle. First time indoor grower. Am at D41 under a spectrum king 400 and I fear that my young lady is suffering from a nitrogen deficiency. Could I be rather forward and ask that you might consider her condition on my behalf? Problem: Nitrogen...