The plants will have to be moved to a indoor set up.
I have 1.2x1.2x2m tent, 600w HPS, 6” filter, 6” centrifugal fan with speed control and a air cooled hood.
Temp/humidity meter, ph/ec/tds meters on the way as well.
They are in pots, not sure of the exact size but will be sufficient.
Soil is organic, currently being fed regularly nutes nix with 6-1-3 ratio and molasses every 3rd feeding.
Outside temps are around 30 - 40 degrees Celsius (86-104 F)
Plan is to use passive intake and negative pressure to contain, scrub and exhaust air out.
The tent will have to be outside the house in a covered but open air area.
I understand the issues with pests so will use need spray and garlic tea for the soil.
There will also be an oscillating fan down the bottom.
So…the 2 questions I have -
Considering the outside temps with passive intake of the ambient temperature outside air, will the plants be ok with the tent temps slightly higher than the outside?
Keeping in mind they are already outside and doing well in the temperature with direct sunlight exposure from about 8am until 3pm
Low humidity climate as well.
If this will be an issue, will it be too much stress for plants in late veg stage if I do the following -
Bring the plants into a lit up tent around 3-4pm in the afternoon and have a initial 24h light to allow me to sync up to be able to run 14/10 with light on at night and reduce the temperature that way (night temps of 17/20 C?
I would suggest getting the tent up and running and monitor the temps for a few days before moving the plants. Running the lights at night will surely help, but Im not so sure your going to be able to keep the temps low enough during the day with the tent outside. Im guessing it will be 10deg hotter in the tent. Only one way to find out for sure.
I tried to grow like this a few summers back… very challenging, i am in the same climate, very hot and dry… make sure you have filters on every exhuast/intake because bugs will get sucked in through intake outlets… id suggest running the light at night like u said, if they are in late veg then they should be fine with the intial lighting switch from day to night. 14/10 is a good scheldue. Id suggest lights come on at 7pm and go off at 9am , this is how i was able to beat the heat. But i did have days in the 100-120f, with fan and ac and misters blowing. Just gonna have to dial it in and go with the flow… and try to have 0 sun beaming on the tent, any direct sunlight is gonna make the tent hot. Try to get some sheets or something up all around the tent to block it in, if its got good shade all day your ambient temps will be lower… i had used all LED lighting, so im not sure how the 600w will fare. Since its air cooled
light u might be able to pull it off if u can dial in the intake and exhaust. Good luck
Maybe try a cool tube hood for the 600w and ducking up to an extraction fan high on the top tent rail down to one side of the cool tube and out tent thru more ducking from other side of cool tube.
To keep things cool try a portable air con cooler stand. Fix some type of ducking over the front and vent tubing into the tent,put cold air in as high as possible(cold air will drop thru the plants) without it getting sucked straight out of course thru the exhaust venting
Remember hot air rises cold air falls