MichiganMedGrower
Well-Known Member
I understand just fine but your second paragraph says what I was trying to say. Much better than I did.
65% rh flower
- Thread starter BakingcoOkiez
- Start date
Budley Doright
Well-Known Member
Can you explain how it functions then in regards to the plant? Why follow the VPD chart?
davillains
Well-Known Member
I run co2 and what I've understood from VPD is that you achieve higher/faster plant metabolism/respiration with certain humidity/temps (from the chart), which combined with plenty of light will make better use of your co2 enrichment. I have I got it wrong ?
Afgan King
Well-Known Member
Fuck the vpd chart 35% day 45% night whole life love it never a mold issue always tight resinous buds no issues 71° day as low as 58° nights average like 60° enrich at 1300ppm co2
MichiganMedGrower
Well-Known Member
I agree that the parameters you have work @Afgan King but I would add a humidifier and heater to bring up the values a bit.
Your room is colder than average and that my be helping with the low humidity.
Although your buds are beautiful I believe some of the burn and edge curling shown on your leaves above and in my garden as well are partly due to over respiration from the VPD imbalance. Even at 50 to 60% RH and 76 degrees average I still experience more uptake issues especially as the plant becomes more inefficient towards the end of its cycle.
It all seems to go better in summer when I am bringing humidity down from the high humidity outside. I think the actual pressure on my room is higher during that time and the plants have an easier time at the top of my range. Which is 77 degrees and 65% RH. Any higher and I would get a bigger dehuey.
Cause no way would I risk the numbers the chart shows inside but it still seems valid to me in regards to plant health.
And my yield and quality go up the healthier the plant is to the end every time. And it has gone down with my drier colder house so far this season.
Your room is colder than average and that my be helping with the low humidity.
Although your buds are beautiful I believe some of the burn and edge curling shown on your leaves above and in my garden as well are partly due to over respiration from the VPD imbalance. Even at 50 to 60% RH and 76 degrees average I still experience more uptake issues especially as the plant becomes more inefficient towards the end of its cycle.
It all seems to go better in summer when I am bringing humidity down from the high humidity outside. I think the actual pressure on my room is higher during that time and the plants have an easier time at the top of my range. Which is 77 degrees and 65% RH. Any higher and I would get a bigger dehuey.
Cause no way would I risk the numbers the chart shows inside but it still seems valid to me in regards to plant health.
And my yield and quality go up the healthier the plant is to the end every time. And it has gone down with my drier colder house so far this season.
MichiganMedGrower
Well-Known Member
I think you got it fine. Better easier respiration for the plant at the high values. But indoors in a sealed room especially I would weigh the dangers and benefits of high humidity for sure.
But I thought It was high light intensity and high temperature combined to benefit from co2.
Do I have that info wrong? I meant to ask @Afgan King that question too as he runs colder.
Budley Doright
Well-Known Member
At 25-30c below freezing in mid winter, and not running a sealed room I have no problem with humidity, my skin turns to lizard skin upon entering the shed lol. I have to dump about two gallons of water to get humidity above 45 
. As AK says fuck the VPD chart, only because I have enough to worry about lol. It, IMO, just another tool if people want to use it.
. As AK says fuck the VPD chart, only because I have enough to worry about lol. It, IMO, just another tool if people want to use it.
MichiganMedGrower
Well-Known Member
Yeah man your grow proves that we have all these different tools to use because every situation is different.At 25-30c below freezing in mid winter, and not running a sealed room I have no problem with humidity, my skin turns to lizard skin upon entering the shed lol. I have to dump about two gallons of water to get humidity above 45
Different to amazing extremes in your case!
Budley Doright
Well-Known Member
Ya all it takes is money lol. My electric bill is redicules in the winter.
MichiganMedGrower
Well-Known Member
Ok. Just out of curiosity I looked up the average temp and humidity of Mendicino County California. I think the plants growing there are pretty happy.
It is 56 degrees farenheight and 89% humidity. The VPD chart shows half of that humidity Ideal for the temperature.
Now I don't know what to think. I guess the chart shows correct in an Equatorial rain forest.
It is 56 degrees farenheight and 89% humidity. The VPD chart shows half of that humidity Ideal for the temperature.
Now I don't know what to think. I guess the chart shows correct in an Equatorial rain forest.
MichiganMedGrower
Well-Known Member
I am never complaining about my bills in Michigan again after your post.
Budley Doright
Well-Known Member
last bill was 335 for 30 days and haven't hit the switch in the lab yet, my outdoor is keeping me happy for now .
.
Carolina Dream'n
Well-Known Member
I follow VPD, but not all the way through flower. It's very critical in a time when the plants are just putting on vegetation. I'll then slowly tamper down the RH.
These are lights on temps and humidity, night temp is pretty much 74-76 and RH 50%.
Veg
Week 1- 84; 70%
Week 2- 86; 75%
Flower
Week 1- 88; 80%
Week 2- 86; 75%
Week 3- 84; 70%
Week 4- 82; 65%
Week 5- 80; 60%
Week 6- 78; 55%
Week 7- 76; 50%
Week 8- 74; 45%
If a 9 week strain, repeat week 2, if a 10 week strain, repeat week 2 and 8.
These are lights on temps and humidity, night temp is pretty much 74-76 and RH 50%.
Veg
Week 1- 84; 70%
Week 2- 86; 75%
Flower
Week 1- 88; 80%
Week 2- 86; 75%
Week 3- 84; 70%
Week 4- 82; 65%
Week 5- 80; 60%
Week 6- 78; 55%
Week 7- 76; 50%
Week 8- 74; 45%
If a 9 week strain, repeat week 2, if a 10 week strain, repeat week 2 and 8.
Afgan King
Well-Known Member
Its simple fuck vpd lol @RM3 does the same humidity and temps basically. But humidity is one thing we both agree on fully with 35%. And buddy my partner just pulled 34.4 lbs off of 14 lights with those same parameters I gave you.....
ismann
Well-Known Member
I'm in FL and never worried about humidity unless my scrubber wasn't working as well. I've grown in low humidity and high humidity with the same strains and never noticed much difference. As long as scrubber works and mold stays away, I'm fine. I've never had bud rot and I've had flowering cycles never get lower than 60%. Air movement is key regardless.
Afgan King
Well-Known Member
Btw the edges are burnt because weeks 6-8 I'm pushing upwards of 2200 ppms. It works for every strain tho with my system even cookies just get some light burnt tips to know I'm pushing them
Youre acting like youre trying to prove low humidity in flower works, everyone knows this.
Its like coming into an LED thread and stating how well you are growing with HPS.
The question at hand is, how much would your buddy have pulled following a VPD chart?
Afgan King
Well-Known Member
Been growing a decade grown commercially and personally and I've followed the vpd chart before weed is worse quality. We all know high heat and light degrades trichomes so why push 90+ degrees ever? Why push anything over 78 ever? Your gonna come out with the same yield but of bullshit dreaded ugly ass trichome degraded airy ass weed. Sure massive colas that have barely any density look huge but why? Why would I do that when that weed can't even be sold for outdoor prices in Colorado at 1600 a plate. We pull stupid quality and barely get 2 a peice per lb here. The name of the game is quality and yeild not just yield. Your calyxes will have to open up wide to be able to breath better with such high humidity and heat. And again please tell me how many people you know period that pull over 2 a light consistently over 14+ lights on a personal grow single person running it 20'x20'? 2.47 is the most I've ever seen or heard of for anything over 4 lights. And he had strains he pulled over 3 a light with but when you run 8 strains not everything will yeild like that you get og's and cookies that like to yeild barely 2. Again decade of growing used vpd chart dont know one commercial grower who grows over 78° day time and I've been in about 40+ grows all over Colorado.
Afgan King
Well-Known Member
And im in no way trying to down what your saying but why grow weed no one will want? There is a guaranteed quality difference so if you gain an extra .2lbs a light hell even half lb a light it still wouldn't be worth the price loss and the pride loss when you show your friends some horrible ass weed lol