ninjadip
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But how cold is the question, 70 is good enough?
But how cold is the question, 70 is good enough?Added the pics to the post since i forgot. Yeah its all about plant temps. But cooler temps slow growth so only manipulate them at the end
68-70f plant temps not air temps.But how cold is the question, 70 is good enough?
What do you mean by plant temps not air? The water temp?68-70f plant temps not air temps.
Anthocyanins do best below 70f and where photosynthesis is lower. So cutting nitrogen and dropping plant temps is the key to maximizing your color expression
Use an IR temp gun to check the actual temperature of the plant. Under LED its use 4-5f cooler than air temps but plants temps unlike air temps a couple degrees makes a big difference.What do you mean by plant temps not air? The water temp?
I'm sorry, I'm not following, I thought the air temp is the plant temp.
oh wow! i thought i had all the tools, but here is another one. Can i just assume that the temp is 5f cooler than the air temp without the gun? or does it vary depending on tent volume/plant ratio?Use an IR temp gun to check the actual temperature of the plant. Under LED its use 4-5f cooler than air temps but plants temps unlike air temps a couple degrees makes a big difference.
They are like $30 and should also be used to calculate VPD. Most underrated and underutilized tool in a grow roomoh wow! i thought i had all the tools, but here is another one. Can i just assume that the temp is 5f cooler than the air temp without the gun? or does it vary depending on tent volume/plant ratio?
Interesting, thanks cause I love learning the science of it all!
oh cool, just read some info on VPD, never heard of it before. I do think I was facing a low VPD point before I added the intake fan. Now I am very confident about the air exchange in the tent, the growth rate increased exponentially when I added the fan. I bought a smaller sized intake fan vs the exhaust based on a forum. I then put it on a cycle timer, 5 on /20 off, so that the air is exchanged every so often.They are like $30 and should also be used to calculate VPD. Most underrated and underutilized tool in a grow room
You must take leaf temps into account using VPD. I would leave the fan on all the time. Co2 replenishment is important. Not a big deal in the early stages but as they grow they can deplete co2 very fast.oh cool, just read some info on VPD, never heard of it before. I do think I was facing a low VPD point before I added the intake fan. Now I am very confident about the air exchange in the tent, the growth rate increased exponentially when I added the fan. I bought a smaller sized intake fan vs the exhaust based on a forum. I then put it on a cycle timer, 5 on /20 off, so that the air is exchanged every so often.
Below is a picture of when the intake fan is on, swelled tent, and when it is off, awesome negative pressure.
RH levels vary from 50-65% during air flush.
I did just buy a moisture meter to help with the drying phase when that time comes, I thought that was going to be my rare tool lol.
I have a small CO2 bag in there, but I am not confident that it produces enough CO2 to be sealed. So by having the intake fan off for a period I believe the plants are getting some nice doses of CO2. The intake fan helps me get rid of all the moisture from the plants perspiring in there.You must take leaf temps into account using VPD. I would leave the fan on all the time. Co2 replenishment is important. Not a big deal in the early stages but as they grow they can deplete co2 very fast.
Some reading on VPD here.
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
Yeah dont seal it unless you have the equipment and in a tent i don’t recommend it unless its a very large tent and even then.I have a small CO2 bag in there, but I am not confident that it produces enough CO2 to be sealed. So by having the intake fan off for a period I believe the plants are getting some nice doses of CO2. The intake fan helps me get rid of all the moisture from the plants perspiring in there.
I think the CO2 is also contributing to my nice plant growth. I put a cheap sensor in there and I got up to 900 at times between fan cycles, but I am not confident in the $10 Amazon sensor. It does read 350 outside of tent which is expected.
I am just too nervous about making it completely sealed because of humidity, and don't want to go the route of a commercial dehumidifier.
Thank you for all your help and timeYeah dont seal it unless you have the equipment and in a tent i don’t recommend it unless its a very large tent and even then.
Controlling humidity is very key
I run bottled co2 but looks like your bag is producing co2 as far as i can tellOk so I believe it is putting out some CO2 in there. That bag looks like it's in full swing but idk, never seen one before.
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