Grownsince95
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A common misunderstanding is that the transpiration of plants will affect the humidity in a grow room
Absolutely. I think it pretty much crawls to A stop after 90%. That's why we keep clones in that environment so their leaves won't have to do any "work" they can actually get moisture from the air when they have no roots.All good.
one quick question though.
Letβs just say the grow room did hit 100% humidity. At that point, technically wouldnβt plant transpiration fully stop?
All good.
one quick question though.
Letβs just say the grow room did hit 100% humidity. At that point, technically wouldnβt plant transpiration fully stop?
So thinking that your other tent is getting some kind of power surge to the light that is on in the flowering tent? Is the tent position in the room closer to any heat output in the king room? How does airflow change within the room?I don't think so, I could be wrong. The dehumidifier is definitely adding heat, but why an extra three degrees? It's a really small vivosun peltier process model, and it couldn't suck a raindrop out of a thunderstorm if it wanted to. It's basically there for emergencies. The only difference in anything that's going on when the temp rises are that the three 75 watt lights in the other tents turn off. Power issue?idk
I feel like there are way too many variables to even prove it wrong one way or another.
even if you grew two identical setups, but one following the vpd chart and one with a very high or low humidity the whole time... would it even be a noticeable difference or are we talking in the 1-3% range here?
I followed it during veg a little because if I donβt, my OCD eats me up and FOMO kicks in and Iβll always wonder if it woulda been better if i had done this or that. I donβt know if I followed it properly though as I used a cheap humidity meter and didnβt read leaf temp
Agree 100% ...except for the 10% of the water trapped in the plant's cells for life functions that's not transpired.Plants dont follow the vpd chart. They adjust to environmental conditions. Many tests on humidity and cannabis and yield is unaffected by humidity. Its even in ed rosenthals book. Cannabis grows well in the mountains of colorado and the coast of oregon for example.
and 100% of the water given to the plants eventually transpires or evaporates into the air.
Agree 100% ...except for the 10% of the water trapped in the plant's cells for life functions that's not transpired.
Again we agree!Vpd charts are for greenhouse management. They are to mitigate high humidity not present a parameter that is desirable if you have control of temp and humidity.
I think its more misdirected forum bro science. Every test i saw showed no difference in quality or yield with low or high humidity. Temp is a factor for plant growth though.
but avoiding mold and mildew is more important imo and keeping things under 60% can prevent issues.
You would make a great litigator!I just assumed that water is continually replaced.
Again we agree!But a word on "bro science" ...
For many, many years farmers would meet at harvest time for festivals or markets or whatever and they'd bring their crops and some guy would show up with like monster zucchini or ridiculous tomatoes and all the other farmers would say "Hey Jeb, how did you grow such wonderful vegetables?" and Jeb would tell them all this cool stuff and those farmers would go back and repeat those techniques and pass it on and on and on.
Farmers figured out long before "science" that nice deep, loose soil grew long beautiful carrots. That's the original bro science. This forum is pretty much a yearlong farmers market Internet bro science festival
You would make a great litigator!This is very true, so I guess its not 100% out until we dry it...
I play the bass and I started building my own from kits. Saved a lot of $ although I still have my "classics"all hobby forums and groups are. The guitar forums cost me even more needless money than the weed forums. ;-)
Yes two of three tents have T4's...very good point I bet thats exactly it! They tend to only run 100% on at night when the rh goes up. I have them both set for 82Β° and flower tent set for 60% rh. β€So IME when you see something like this the first thought is ALWAYS sensor placement... is one closer to the dehumidifier exhaust etc.
Next is the air exchange rates and difference between tents. If your using something like a controller or cloudines that adjusts or kick on/off based on humidity its changing the air exchange between tents and therfore the temp also.
And there's the sensor. It's on the same side of the tent as the dehum but far enough I thought because that barely blows anything (its such crap) and the two other fans keep a really good breeze all the way down to the floor. Should I move the sensor? I think you figured it out though man thank you very much!!So IME when you see something like this the first thought is ALWAYS sensor placement... is one closer to the dehumidifier exhaust etc.
Next is the air exchange rates and difference between tents. If your using something like a controller or cloudines that adjusts or kick on/off based on humidity its changing the air exchange between tents and therfore the temp also.
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