justgrowing
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I’m going to assume you are very late in flower with a target vpd of 1.5 kPa +/- .2 is flirting with being in the danger zone of over transpiration. Personally, I try to maintain 1.4 kPa in late flower. I also drop my temps and rh is in the mid 40’s. No higher than 50% ever for me late flower.
..." No higher than 50% ever for me late flower. ".....I wish....never can I get my rh that low except a few weeks in the dead of winter when its -20c outside......I'm at 55% @ 78f now with dehue running full time......as long as I don't get it up over 60% I'm happy. I'll put on another dehue if it gets into the 60's and with good air movement I haven't had mold issues.....without air moving I grew grey mold the size of small mice wrapped around my stalks.....3 oscillating fans running 24 7 now..I’m going to assume you are very late in flower with a target vpd of 1.5 kPa +/- .2 is flirting with being in the danger zone of over transpiration. Personally, I try to maintain 1.4 kPa in late flower. I also drop my temps and rh is in the mid 40’s. No higher than 50% ever for me late flower.
What is the leaf temp offset?Trying to at least maintain this right now. Flower week 3 photos here, getting a little crowded, two indicas, two indica/sativa.
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I can't say that I've measured that.What is the leaf temp offset?
I let my controllers figure it out for me. I just set and maintain the parameters.I just looked at 3 different vpd charts and the numbers were all different. I have 3 different ir guns and get 3 different leaf temps. Shit is way too complicated for my tiny brain to figure out.
If you are under LED lights it’s probably around 4 degrees. You should enter that into your controller settings and watch what that vpd number does.I can't say that I've measured that.
NotedIf you are under LED lights it’s probably around 4 degrees. You should enter that into your controller settings and watch what that vpd number does.
I also have fresh filtered cool input air from an un heated oil tank room at about 64f......Off note I used to work in a ship yard as an electrician.with the temp power & ventilation crew. Large ship holds we'd ventilate by putting a large input fan and on the other side the same sized exhaust fan....15 - 20ft deep same across large ship ballast tanks where welders are down inside working on the bulkheads. ..........We'd enter through hatches where the wind would be exhausting and blowing our hard hats off but once we we're in side, a few feet down the ladders it was calm...no wind and no smoke the smoke went out where the fans sucked it too....all was at peace except for the arcing from the welders.......Much like @PipeCarver my summer grows have had a hard time getting below 50% RH and are usually sitting between 50-55% and sometimes as high as 60% during late flower.
I just chopped the grow that was going on in that tent, and neither had PM or Bud Rot. I do have 1 oscillating fan on the ground, 3 stationary fans above the canopy to keep the air flowing as well as an exhaust fan that's pulling out hot/humid air at the top.
Also keeping the ladies trimmed enough to allow that air to move around is key IMO. That allows that moving air to get where it needs to be.
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