Does this plant have some kind of nutrient deficiency? Yellowing first true leaves

Well, it was too good to be true for long. Again, the humidity is back up in the high seventies, without it even raining.

The aircon has simply lowered the temperature in the room.

From a VPD chart this seems like it could make the issue worse.
 
At this point I have the following issue.

My plants are in a large room that is functioning as a smaller grow tent would.

With no aircon, the temperature is 30 degrees Celsius with humidity at around 64%.

With aircon, temperature can drop to 25 degrees Celsius but humidity rises to the mid seventies.

I would guess some of this has to do with air holding less water at lower temperatures.

Which situation is preferable?

From a VPD chart it seems that 30 degrees and 64% is fine, but 25 degrees and 75% is not.
 
As for the actual plants in flowering (I am in the fifth week of flowering), what should I expect in terms of browning/yellowing of leaves?

Should the leaves remains perfectly green throughout the flowering stage?

I haven't understood this yet: the plant is consuming resources at a high in this final stage of its life. It will die but it wants to reproduce; at what point in flowering is it normal to start seeing normal depletion of resources on the leaves themselves?
 
It should look pretty healthy until the last week or two when it goes through senescence. At that point it will stop feeding from the stuff you provide and start cannabilizing its leaves. And then it'll slow its drinking way below what it typically has and at that point you can start checking trichomes with a loop.

But, most strains go anywhere from 8 weeks for a typical hybrid to many more for heavy leaning sativas, so you've still got at least a couple of weeks to go before the end game.

And I consider flowering time to be from first pistils (really stigmas), not from flip, and that can be a week or two on its own.
 
Back
Top Bottom