Control your cannabis - Temperature and EC

[stonedstump]

Thanks Ragin, i'm glad you found it useful. I know I did when I first came across it.

 

I think 15 degrees should be ok, maybe a little bit warmer.

 

 

I'm going to cheat budman and copypaste it now I have the website

 

 

EDIT: I just went to paste it in but I can't edit my original post. The edit function must disappear when you close the window.

well if anyone wants to see the second part of it (not the most important part), you can click the link nugget provided up

above there.

Edited July 9, 2006 by stonedstump

[pipeman]

for those of you with a veg box as well instead of a heater you could try hooking up the exhaust of your veg box to the intake of your flower box. (making sure there is no light transmitted). This should help keep your flower room warm.

 

2nd option is to run your lights at night in the winter and have your dark time suring the day this will help even out the temp differences.

 

3rd option is to modify your ventilation in the winter so that you intake through the top of your cabinet and exhaust through the bottom, so the warmth of the light is being pulled over the plants. This won't help during the dark period obviously but will help keep your growroom warm if you are running your lights at night in cold weather...

 

a heater is also an option, but I don't like em cause they use a lot of power and are a fire hazard. but if they solve the problem, then why not.

[pipeman]

another thought I had was decreasing the ventilation in the dark period (or even the light period)

 

It is often said that you can't have too much ventilation, but if your outside air is so cold you need to have a heater in your grow maybe this isn't the case. The extreme ventilation you see in most cupboard setups are to deal with heat, not because the plants need that much fresh air.

[Luke Skywalker]

Indeed, it is the heat you're primarily dealing with with high levels of ventilation. You could certainly restrict your airflow, provided you don't go too low though. It's better to be well ventilated and cold than badly ventilated and cold. If you have a good oscillating fan you should be able to deal with any potential problems restriction of venting could cause.

 

Put a few bends in your ducting and you'll be reducing the strength of the airflow.

 

Heaters are hazards if you get the wrong type. Have a good thermostat, (pref a hot and cold one for versatility), make sure your heater has a cut-out switch in case of falling over and ensure it's up off the ground and away from any water. That may be a bit much to ask of some though.

 

I heat my greenhouse in winter this way.

 

On the issue of the electric bill, it shouldn't be too bad provided you don't try and heat the room too much. It may take some playing around to work out the minimum temps that you want, but 15 sounds about right to me. Get a ceramic heater with high efficiency if possible.

[bufo marinus]

Excellent article

The last cab I built had the lights on at night and the air coming through the veg cab first.

I was thinking I was getting faster growth rates this time, but thinking about it now I don't think so.

Also the brief explanation on EC, root temp, osmosis and water uptake is gold

[smoke p]

thanks so i basicly gotta keep the light as kool as i can so that it matches night temps

[chorusverse]

Old thread I know , but I am wondering about the night time temps getting 4-5c above the day time temps. That's where i am at presently and i think it is causing inter-nodal stretching and chlorosis. Can anyone help??

[falconcobra]

I think higher nite temps cause spacing to be shorter, thats the thoery anyways

 

Edit: In reply to the above post.

Edited December 29, 2009 by falconcobra

[chorusverse]

Thanks for the reply. Yeah everything says negative difference on temps shorter spacing, but there is always a warning not to push it to far... I just wondered what would be the case with a 9c DIF. But yeah I also had pests I discovered a day or 2 later, and they where the cause of my issues. Again thanks for replying.

[falconcobra]

I take it ur running ur lights during the night.. yeh 9 degerees mate im not sure, if u got more then 1 strain going and their all stretching then obviously aint strain specific.. Could try getting a fan on them, encourages thicker stem growth instead of stretch.