Nutrients Autobot 1st Grow, Biotabs & Mephisto

[Moonshade]

What do the decimal numbers inside represent

Welll dont know VPD?

 

[Autobot-J]

Vapor Pressure Deficit
Okay, so now that you have RH firmly implanted into your conceptual map, we move on to Vapor Pressure Deficit or VPD. As implied by the word "deficit" we're talking about the difference between two things. In this case, it's the difference between the theoretical pressure exerted by water vapor held in saturated air (100% RH at a given temperature) and the pressure exerted by the water vapor that is actually held in the air being measured at the same given temperature.

Theres one with a key at the top right

It's just basically telling you during different stages of growth, the affect the RH has on a plant is directly related to the current temp. So you can adjust to stay within optimal ranges, or to be used as a troubleshooting guide to rule out temp and RH as a problem in your setup!

 

[Autobot-J]

Based off that info...I need to drop my temp down if I can...I guess increase exhaust speed. Because my RH just isnt going to go above 65, plain and simple. Just hope the fan increase doesn't pull more moisture out too

 

[Iriee Vibez]

Vapor Pressure Deficit
Okay, so now that you have RH firmly implanted into your conceptual map, we move on to Vapor Pressure Deficit or VPD. As implied by the word "deficit" we're talking about the difference between two things. In this case, it's the difference between the theoretical pressure exerted by water vapor held in saturated air (100% RH at a given temperature) and the pressure exerted by the water vapor that is actually held in the air being measured at the same given temperature.
View attachment 1037909
Theres one with a key at the top right

It's just basically telling you during different stages of growth, the affect the RH has on a plant is directly related to the current temp. So you can adjust to stay within optimal ranges, or to be used as a troubleshooting guide to rule out temp and RH as a problem in your setup!

Exactly. If heat is higher you need higher th to keep in the zone.


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[Iriee Vibez]

Based off that info...I need to drop my temp down if I can...I guess increase exhaust speed. Because my RH just isnt going to go above 65, plain and simple. Just hope the fan increase doesn't pull more moisture out too

It’s a target range to maintain environment where plants growth and use of nutrients are maximized. Try to get there, but it’s okay if close.


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[Autobot-J]

Yessir! Thank you for confirming! Pretty sure that has been a factor in my past grows' success rate... I have overlooked that for sure.

It’s a target range to maintain environment where plants growth and use of nutrients are maximized. Try to get there, but it’s okay if close.


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[Autobot-J]

I like this chart actually. Gives the desired ranges in 3 different growth stages.

 

[Autobot-J]

I'm hoping the RH goes up for me as well once they start getting a little bigger. As they are transpiring more and more it should, in theory. By that time, it will be getting hot though, and running more AC, which reduces RH. So it may be an even exchange...but also, the desired RH percentage is lowered as things progress in to flower...so we will see!

 

[Autobot-J]

MBAP

Any input on this little mutie? I think it looks like it will be ok....what you guys think? @Eyes on Fire @Waira @woody @archie gemmill. Anyone else as well...

 

[Iriee Vibez]

Yup. Agreed. Those first leaves don't tell a thing.