I have a question for you all who understand the VPD. I am starting to follow the VPD chart, and even though I have been growing for a few years, this is my first time implementing using VPD. My question is, my temps are pretty stable at 78-81F* for my current growth stage Early VEG, the VPD chart shows kpa of 0.44 and 0.67 my humidity fluctuates between 78 and 83% RH. So I'm bouncing in between these ranges through out the day. This isn't a issue I'm hoping, I guess optimally i would want them dead on and accurate, but ideally I'm good with how it's working for for me?
I understand VPD and I don't really agree with VPD. IMO you should not be running any over 60% post seedling because you are inviting mold and other opportunistic pathogens. Veg 50-60. Flower 40. Keep your temps in check (~25°C) and you will be good thoughout. The vpd doesn't consider trichome count, or how trichomes increase in dry climates.
..and your vdp should change dues to day conditions even inlet air will have drastic changes to room humidity