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Jumping Right In! Brand New Set Up

RH is just too low really Do what you have to do for 80% rh and above. Lower temps can help raise it a bit. Go for 74° and see how much the rh bumps uo. I will see if the towel drops the temps and go from there.
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Jumping Right In! Brand New Set Up

by Goodthingsgrow · Started
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Discussion below · 401 replies
Page 11 of 21 · Replies 201–220 of 402
#202
No one talks about VPD in cloning but it's actually an essential concept to understand for the process to be successful. The goal is to actually keep our plants out of the "happy" zone so they can relax and not have to transpire without roots.

If you look at the chart around 77ﾟand below, 80% humidity gets you into the red zone. But as temperature increases into the eighties, all of a sudden you're in the zone where plants are doing their thing like they were in a normal state and RH needs to be higher to "turn them off"

Does this make sense?

Lower temps allow you to to utilize a lower rh.
Screenshot 20201210 113950 Gallery

What you dont want is all the way to the left where the values are zero. Zero bad.
 
#203
Grownsince95 said:
No one talks about VPD in cloning but it's actually an essential concept to understand for the process to be successful. The goal is to actually keep our plants out of the "happy" zone so they can relax and not have to transpire without roots.

If you look at the chart around 77ﾟand below, 80% humidity gets you into the red zone. But as temperature increases into the eighties, all of a sudden you're in the zone where plants are doing their thing like they were in a normal state and RH needs to be higher to "turn them off"

Does this make sense?

Lower temps allow you to to utilize a lower rh.
View attachment 1065985
What you dont want is all the way to the left where the values are zero. Zero bad.
Click to expand...
Yeah VPD is important. I also find my ideal temo first then adjust RH to the temp but always taking leaf temps into account. Quite often you will find leaf tenp and soil temp are very close
 
#204
Grownsince95 said:
No one talks about VPD in cloning but it's actually an essential concept to understand for the process to be successful. The goal is to actually keep our plants out of the "happy" zone so they can relax and not have to transpire without roots.

If you look at the chart around 77ﾟand below, 80% humidity gets you into the red zone. But as temperature increases into the eighties, all of a sudden you're in the zone where plants are doing their thing like they were in a normal state and RH needs to be higher to "turn them off"

Does this make sense?

Lower temps allow you to to utilize a lower rh.
View attachment 1065985
What you dont want is all the way to the left where the values are zero. Zero bad.
Click to expand...
Did you say we are trying to keep them ‘out’ of the happy zone? Are we trying to get as close to one (the green) as possible?
 
#206
Goodthingsgrow said:
Did you say we are trying to keep them ‘out’ of the happy zone? Are we trying to get as close to one (the green) as possible?
Click to expand...
No happy zone when trying to root because it demands too much of the plant without a root system to support it. So, let the plant NOT transpire and instead use its energy to root.

The knowledgeable dudes will correct if I have this wrong.
 
#207
Goodthingsgrow said:
Did you say we are trying to keep them ‘out’ of the happy zone? Are we trying to get as close to one (the green) as possible?
Click to expand...
KPA of about 0.4-0.6 for clones not yet rooted. Once rooted 0.4 to 0.8

www.thcfarmer.com

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...
www.thcfarmer.com www.thcfarmer.com
 
#208
Goodthingsgrow said:
Did you say we are trying to keep them ‘out’ of the happy zone? Are we trying to get as close to one (the green) as possible?
Click to expand...
Yes, out. But I was probably being overly simple. @amekins said it great. And if you look at @Aqua Man #'s that is right at that red zone I'm talking about. 👍
 
#209
Aqua Man said:
KPA of about 0.4-0.6 for clones not yet rooted. Once rooted 0.4 to 0.8

www.thcfarmer.com

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...
www.thcfarmer.com www.thcfarmer.com
Click to expand...
Remember these are guidelines not hard rules. Just because your a bit out does not mean they won't root
 
#210
Grownsince95 said:
Yes, out. But I was probably being overly simple. @amekins said it great. And if you look at @Aqua Man #'s that is right at that red zone I'm talking about. 👍
Click to expand...
Generally speaking any rooted plant will do fine around 1.0 KPA start to finish. But the post i linked is putting things into ideal conditions for stage of growth. Like I say no hard rule but a good guideline for optimal VPD.
 
#211
amekins said:
No happy zone when trying to root because it demands too much of the plant without a root system to support it. So, let the plant NOT transpire and instead use its energy to root.

The knowledgeable dudes will correct if I have this wrong.
Click to expand...
I just heard something click in my head.
Thank you. Understood.
 
#213
amekins said:
No happy zone when trying to root because it demands too much of the plant without a root system to support it. So, let the plant NOT transpire and instead use its energy to root.

The knowledgeable dudes will correct if I have this wrong.
Click to expand...
Nope absolutely right. We want to reduce transpiration to a minimum without eliminating it. Even though they have no roots they will take up a tiny amount of water.
 
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