ArcticOrange
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This is a key factor in the ability to grow perfectly good meds without adherence to vpd parameters.I would like to say I think this vpd curve gets adjusted out slightly with everything we are giving our plants. I know the extra K (allows for movement of more water and heavier transpiration) in potassium silicate and the silica (bigger highways for the water in the plants) allows me to run my room a little warmer and dryer than I should.
I got it.just re-read my post above... thats what happens when you wake up at 8AM and stay up til 3AM. so many errors. hopefully you guys can understand what i was trying to convey.
exactly.I think he's saying that he now understands why the one room was doing so well whereas the others were struggling. VPD was the difference.
I got it.
Ok, that's a "WHOA!" for me. Great information to keep tucked away in one's pocket!even OGs that were showing cal deficiencies the moment i used less than 6-7 MLs of calmag were cured just by following the VPD chart. now they look perfectly green with 5 MLs max.
exactly.
its always been preached that having your room environment 'dialed in' was the most important part before you start to buy all these expensive nutrients and gadgets, yet so many people - including myself - overlooked it. getting your VPD dialed in will most likely solve SO many deficiency/growth problems and boost vigor, yield and potentially quality SIGNIFICANTLY.
you will most likely want to drop humidity in the last few weeks of flower once they bulk, especially if you pack your plants in and have dense foilage.
even OGs that were showing cal deficiencies the moment i used less than 6-7 MLs of calmag were cured just by following the VPD chart. now they look perfectly green with 5 MLs max.
RO water wont leave mineral deposits. I use my AC condensate in my humidifiers...super low PPMs and they never clog.Not to mention its a pain in the ass,more equipment,RO water to not make a mess on your lamps or glass etc.
after reading into VPD and actually seeing the SIGNIFICANT benefits of running 'high' humidity (65-75% in flower) I now truly believe what everyones favorite 'JackMayOffer' was talking about.
The effect of constant AC is that its dehumidifying the air to the range of 40-50%. In those rooms I constantly had thin, purple and stiff plants when I first transplanted up until 2 weeks later when they were large enough to perspire and raise the RH into the 60%s. Those plants wouldnt more often than not lock out if the medium hit around 2500 PPMs and I couldnt understand why even though I was feeding them the full line of nutes from different companies in separate cycles.
I've been running 72F canopy temps (max) and 15% RH for years now. When I run cuts from other growers, they don't recognize the end product as coming from their genetics. The terpene and cannabinoid production, as well as the trichome density, is significantly higher.I mean if you want growth so fast that the leaves grow faster than the thc can cover the leaf then vpd is the way to go.but ime lower rh beings on more resin.of course thats just my own observation lol
Sorry, I'll have to disagree with this. The size of the cells are the same either way. The number of the cells are the only thing that changes.Think of each plant as growing only a certain number of trichomes on itself. The more *plant* you grow, the further apart the trichomes are.
Disagree all you like, then grow the same strain in high vdp (high temp/RH), then moderate vpd (low temp/RH) and see the difference. Same strain is frostier in the low temp/RH. I used to think it was a genetic trigger, now I know it's just plant growth rates.Sorry, I'll have to disagree with this. The size of the cells are the same either way. The number of the cells are the only thing that changes.
Lower temps and RH in late flower is one thing but in veg VPD does play a role in production of mass. The point i'm trying to make is that the size of the cells don't change, you just have more cells. So it still comes down to the genetic potential of the strain.Disagree all you like, then grow the same strain in high vdp (high temp/RH), then moderate vpd (low temp/RH) and see the difference. Same strain is frostier in the low temp/RH. I used to think it was a genetic trigger, now I know it's just plant growth rates.
BTW. When you don't see a difference in terpene production/retention, your other variables are off.
It means nothin.... stoma adapts to environment... i can show you tons of great plants that were grown in the red....veg and flowerLet's hear what you think about VPD , or Vapor Pressure Differential , and it's importance to YOUR growing style. Do you follow it? Do you care? Has it changed your game? Let's hear it!
Everyone is entitled to their own opinions. Let's keep the heckling down to a minimum and keep our minds open.
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Peace
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