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What Is Your Vpd....

  • Thread starter Thread starter hammerhead
  • Start date Start date May 18, 2015
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What Is Your Vpd....

hammerhead May 18, 2015 45 Replies 13,588 Views
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Billyboat

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#21
I run 75% at around 80-82 degrees and co2 around 1000 till week 5 and then I start to dial it back to 50% as I've gotten rot on a few of those big colas.

What really helped me was floor fans, lots of fans up top and lots of fans down below. No stale air.
 
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hammerhead

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#22
Is anyone not using co2 with 70% rh?
 
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planesane

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#23
I have some questions about the vpd chart.

Air temps matter correct? what happens if temps are 20 C at canopy and a 40 RH? according to the chart I am still in the green zone, but not all charts are this detailed in my opinion. Can i still get similar results with these temps and humidity? will I still get the same growth as a 80 F 70 RH environment?
 
Last edited: Apr 10, 2018
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GT21

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#24
Lmao.... How did this plant survive without all our stupid fuckin charts... Mind boggling.

I know when my plants sit outside in 0% @ 100f...the first thing i do is go run and grab my vpd chart hahaha
 
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indicabush

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#25
GT21 said:
Lmao.... How did this plant survive without all our stupid fuckin charts... Mind boggling.

I know when my plants sit outside in 0% @ 100f...the first thing i do is go run and grab my vpd chart hahaha
Click to expand...

Ha,ha,ha...I have the same chart...somewhere...oh yeah, over the rainbow
 
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DGP

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#26
I didn't see it in the thread anywhere but VPD must mean vapor pressure density?? Dang, this goes against some conventional wisdom on higher levels of humidity I have seen in the past. Are these humidity levels only optimum if your using C02? New stuff to me.....

Thanks,

Dee
 
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sixstring

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#27
this is not for everyone imo.you dont want to use this in a crowded tent or even a room for that matter with unhealthy plants or you will just have more problems.good air movement,healthy plants and good spacing is a must.
 
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heisen

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#28
Never once paid much attention to that chart.only during late flower.to high humidity you'll get bud mold on big colas but as far as growth I've never seen a bit of difference between 40 percent and 80 percent
 
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Mr.jiujitsu

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#29
Never used the chart but looks like I’m doing ok
 
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GT21

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#30
sixstring said:


mines not on this chart but i think its around 25 to 30 most days lmao
View attachment 510399

but at least now theres a chart in the thread right :)
Click to expand...
Lmao i love it!!!!!
 
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RooR5mm

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#31
Mr.jiujitsu said:
View attachment 804643 Never used the chart but looks like I’m doing ok
Click to expand...
You are supposed to be in the green part of the chart.
 
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Mr.jiujitsu

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#32
RooR5mm said:
You are supposed to be in the green part of the chart.
Click to expand...
Laughing
 
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PharmHand

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#33
GT21 said:
Lmao.... How did this plant survive without all our stupid fuckin charts... Mind boggling.

I know when my plants sit outside in 0% @ 100f...the first thing i do is go run and grab my vpd chart hahaha
Click to expand...
Surviving and thriving(achieving maximum output) are two very different things
 
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G gnome

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#34
DGP said:
I didn't see it in the thread anywhere but VPD must mean vapor pressure density?? Dang, this goes against some conventional wisdom on higher levels of humidity I have seen in the past. Are these humidity levels only optimum if your using C02? New stuff to me.....

Thanks,

Dee
Click to expand...
I thought it was vapor pressure deficit...?
 
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GT21

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#35
G gnome said:
I thought it was vapor pressure deficit...?
Click to expand...
Its violent puppy dogs
 
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GT21

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#36
PharmHand said:
Surviving and thriving(achieving maximum output) are two very different things
Click to expand...
In this theory plants in florida and hawaii would grow better than the triangle, southern oregon, colorado?
 
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heisen

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#37
GT21 said:
In this theory plants in florida and hawaii would grow better than the triangle, southern oregon, colorado?
Click to expand...
Different plants require higher humidty.why cactuses and shit grow in the desert and not in the rain forest
 
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GT21

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#38
heisenbubble said:
Different plants require higher humidty.why cactuses and shit grow in the desert and not in the rain forest
Click to expand...
Thats nuts
 
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PharmHand

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#39
GT21 said:
In this theory plants in florida and hawaii would grow better than the triangle, southern oregon, colorado?
Click to expand...
Haha really? Take a look at a postcard from those 5 places which ones appear to have more plant life? Since what you’re saying flys in the face of highly studied well established/accepted horticultural science I feel the burden of proof is on you..... So billyboat ( therealiog) and jackmayoffer( jungleboys) and all those charts created by horticulturists studying plant growth, they’re all wrong in saying that plant growth is accelerated when a minimal deficit is applied? And you’re right because your plants don’t “die” outside in the desert?
 
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GT21

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#40
PharmHand said:
Haha really? Take a look at a postcard from those 5 places which ones appear to have more plant life? Since what you’re saying flys in the face of highly studied well established/accepted horticultural science I feel the burden of proof is on you..... So billyboat ( therealiog) and jackmayoffer( jungleboys) and all those charts created by horticulturists studying plant growth, they’re all wrong in saying that plant growth is accelerated when a minimal deficit is applied? And you’re right because your plants don’t “die” outside in the desert?
Click to expand...
Name drops!!!!

Can they at least make a chart that goes to 100? You know for us low class folks with dying plants.

Are plants allowed to grow at 100... I dont see it on the chart.
 
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Thread info

Replies 45
Views 13,588
Started May 18, 2015
Latest post Jun 3, 2018
Starter hammerhead
Forum General Indoor Growing

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