Positive Pressure a Problem?

[Dr Smith]

So, I've got this girl. She's about 3 feet tall now chilling in a 5 gallon. Very happy and healthy. I moved her into a new tent set up a few days ago. The tent is a 5x5x6 I believe. Same light configuration and roughly the same temperature (within a few degrees on either side). The tent has an outtake and intake fan going which pushed the tent out creating positive pressure. Smell escaping the tent is no issue here so let's not discuss it.

She started to droop the day after she moved in. Well fed, not overfed (I've been through that ringer before). No shock. Racking my brain trying to figure out the issue I realize that in the past I have had negative pressure in my tent set up. So, I pull the intake fan out of the equation. I look today and she's reaching for the sky again.

The only thing I changed was the amount of pressure in the tent. No other changes were made! I read somewhere yesterday that positive pressure on plants can cause them to dry out thus triggering a gene alerting them to a draught. With the soil moist about a cm below the top and the leaves dry to the touch this seems plausible.

Can anybody speak to this?

 

[WDIK]

Do you have any idea what your humidity was before and after pulling the intake fan?

Might be worth an experiment to check the RH with the intake fan in and out.

 

[RockyMtnMan]

I run positive pressure on my tent for a couple years now. It doesn't seem to affect mine, but I'm only an active member, so better ask someone with higher status like someone who posts at three times the rate I do.

 

[MarWan]

it could be the tent needed airing out before moving plants in.
just guesing could be wrong though.

 

[Dr Smith]

Do you have any idea what your humidity was before and after pulling the intake fan?

Might be worth an experiment to check the RH with the intake fan in and out.

Humidity has never been an issue in my setups. Ranged from 20% to 60% plus at all stages of development. Good thought though...

 

[Dr Smith]

it could be the tent needed airing out before moving plants in.
just guesing could be wrong though.

Interesting.. I did about two hours of temp checks before moving them in. Tent was new in the box. Why would it need airing out?

 

[newbiegrow12]

I am a very new grower currently working on my first grow, I have two plants in a 6x3x3 tent running with positive pressure. I have never had this issue with the plants but I started them with positive pressure. I could be that your plants had to adjust from negative pressure to the positive pressure. Id give them a couple days of positive pressure and see how they react, if they aren't taking to it then you can always switch back to negative.

 

[MarWan]

when I sat up my DR120 tent for the first time, I noticed a slight smell, so I let it air out for a whole night.
I've searched for months before I bought the secret jardin tent, I was afraid to get a tent that might release gases.
one other thing you mentioned you had positive presure, and that made me think the air is not circulating properly.