Questions on Indoor Temperature and Humidity

CriticalJackAttack

CriticalJackAttack

Member
Hey Guys! Pleasant Day! Noob here.

I'm about to start a grow cab that's about 4'x2'x4' (max height for plant to grow in and. already took into consideration the allowance for the lights). I've got most of the prepping work figured out (i.e. soil ph, watering schedule..yada, yada,yada...) except for temperature and humidity. Here's a picture of my grow cab:

Lights: 9-band 300W LED Grow Lights (China OEM) and 4x4' 28 watt T5 lights
Air Circulation: 1x intake fan / 1x outake fan / 1x oscillating fan inside the cab
Soil Grow: Hummus Soil with 20% Bat Guano
Nutrients: Water Soluble Nutes for "gardening" tomatoes and such. (30 - 10 - 10 for veg / 10-30-10 for flower)

12081503_10207921496703632_314211154_n.jpg
Now, I live in a tropical climate and I run the nights at night so as to avoid extreme temperatures.Here are the observed temperatures when the sun's up and humidity throughout the light cycle:

Thinking of a straight up 12/12 grow from seed but I'm still open with the 18 hour veg light cycle to increase yields.

Day Cycle:

(9:18 pm)
Temperature: 29 Celsius (84F)
Humidity: 63% (w/out dehumidifier)
35% (w/ humidifier)

Night Cycle:
(10:38 am)
Temperature: 29 Celsius (84F)
Humidity: 59% (w/ humidifier)

Given the set of data above, what would be the adverse effects on my grow? How does a constant temperature fair for the Jack Herer strain. Would this stretch the plant? Or stunt the growth? Also, what would be the health issues that I would encounter (e.g. moulds, spide mites)?

Thanks guys! I'm new to this.
 
B

Buzby517

Member
You wanna Get your Nighttime humidity lower. 40-60%. Above 60% that's when fungi grows. Closer to 50% even lower. If you keep your nighttime humidity Low so you dont get mold. Also you wanna bring nighttime temp below 80. Its end of summer, fall to the plants. Lower temps.
If you don't gdt them lower you may ruin your whole grow with mold. If you survive without mold yield will be stunted.
This is blue cheese Week 6 flower. This is my first Grow. My nighttime temp is 67° humidity 45%. Take the humidifier out. You want low humidity with lights off.CAM00145.jpg CAM00142.jpg
 
CriticalJackAttack

CriticalJackAttack

Member
Buzby517 said:
You wanna Get your Nighttime humidity lower. 40-60%. Above 60% that's when fungi grows. Closer to 50% even lower. If you keep your nighttime humidity Low so you dont get mold. Also you wanna bring nighttime temp below 80. Its end of summer, fall to the plants. Lower temps.
If you don't gdt them lower you may ruin your whole grow with mold. If you survive without mold yield will be stunted.
This is blue cheese Week 6 flower. This is my first Grow. My nighttime temp is 67° humidity 45%. Take the humidifier out. You want low humidity with lights off.View attachment 3525421 View attachment 3525419
Click to expand...
Thank you, thank you, man!

Those are bomb-ass looking plants! I'm going with with a dehumidifier during the night cycle then.

As for temperatures, I heard anything below 86 F (30 C) would work without CO2 enrichment?

What about the temperatures bro? What would happen to the plants if night and day cycles would have constant temperatures and varying humidities?

Again, thank you!
 
B

Buzby517

Member
Want cooler temps at night. 5-7 ° at least. To much constant heat during flower may cause them to hermamodite.
 
mr sunshine

mr sunshine

Well-Known Member
Ideally you would want to keep temperatures between 75 and 80.. and humidity at about 50 percent lower if possible while it's flowering. High humidity can cause mold.
 
DesertGrow89

DesertGrow89

Well-Known Member
Ideally one wants a 10-15 degree drop in temperature at night for strong growth. Temps fluctuate in nature as they should in your room.

P.S. your purple light reminds me of this song:

 
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