I try GREENLEAF nutrients

horribleherk

horribleherk

Well-Known Member
still tinkering with the heaters & when it freezes the frost sucks the moisture right out of the air usually freezes for about 5 hrs a night as soon as the temps get above 36.f the moisture comes back I just raised the heater thermostat to 67.f I'll recheck & adjust again until I get about 65.f lights out temp & hopefullyabout 50% humidity IMG_3949.JPG
 
Cannadab1s

Cannadab1s

Well-Known Member
Yodaweed said:
75% humidity at 81F? sounds like a good way to get mold.
Click to expand...
Yodaweed said:
75% humidity at 81F? sounds like a good way to get mold.
Click to expand...
"
Typically in weeks one and two, the plants are drinking less as they fully enter the flower cycle. Their root mass is still growing, and they are on their way to maturation. In this stage, the VPD should be around 8.0-11 which is a temperature of 77° – 79°F and 65 – 75 percent humidity.

Once the plants are in flowering and need to uptake more nutrients, the VPD should be around 10-13.5. This would be weeks three through four. To achieve this, temps would be a bit lower around 75° – 77°F with a humidity around 55 – 65 percent.

As you move through the flower stage, the VPD would then follow to between 13-15.5 in weeks five through nine. This would mean lower temps around 74° – 76°F and a relative humidity between 42 – 51 percent. This cooler and drier condition will allow the medium to dry out more evenly so that you could have more consistency with irrigation dry downs. The cooler temps will also better preserve the terpenes on the plant."

https://hightimes.com/grow/harrys-world-understanding-vapor-pressure-deficit/
 
Cannadab1s

Cannadab1s

Well-Known Member
Cannadab1s said:
"
Typically in weeks one and two, the plants are drinking less as they fully enter the flower cycle. Their root mass is still growing, and they are on their way to maturation. In this stage, the VPD should be around 8.0-11 which is a temperature of 77° – 79°F and 65 – 75 percent humidity.

Once the plants are in flowering and need to uptake more nutrients, the VPD should be around 10-13.5. This would be weeks three through four. To achieve this, temps would be a bit lower around 75° – 77°F with a humidity around 55 – 65 percent.

As you move through the flower stage, the VPD would then follow to between 13-15.5 in weeks five through nine. This would mean lower temps around 74° – 76°F and a relative humidity between 42 – 51 percent. This cooler and drier condition will allow the medium to dry out more evenly so that you could have more consistency with irrigation dry downs. The cooler temps will also better preserve the terpenes on the plant."

https://hightimes.com/grow/harrys-world-understanding-vapor-pressure-deficit/
Click to expand...
Im a noob, but i assume if grow conditions are kept under control with adequate airflow, mold won't be an issue.
 
Yodaweed

Yodaweed

Well-Known Member
Cannadab1s said:
"
Typically in weeks one and two, the plants are drinking less as they fully enter the flower cycle. Their root mass is still growing, and they are on their way to maturation. In this stage, the VPD should be around 8.0-11 which is a temperature of 77° – 79°F and 65 – 75 percent humidity.

Once the plants are in flowering and need to uptake more nutrients, the VPD should be around 10-13.5. This would be weeks three through four. To achieve this, temps would be a bit lower around 75° – 77°F with a humidity around 55 – 65 percent.

As you move through the flower stage, the VPD would then follow to between 13-15.5 in weeks five through nine. This would mean lower temps around 74° – 76°F and a relative humidity between 42 – 51 percent. This cooler and drier condition will allow the medium to dry out more evenly so that you could have more consistency with irrigation dry downs. The cooler temps will also better preserve the terpenes on the plant."

https://hightimes.com/grow/harrys-world-understanding-vapor-pressure-deficit/
Click to expand...
I'd avoid getting grow know from hightimes, they aren't very good growers mostly just an advertising/marketing company.
 
horribleherk

horribleherk

Well-Known Member
Yodaweed said:
75% humidity at 81F? sounds like a good way to get mold.
Click to expand...
mold is no joke for sure for some reason everything I've grown here that has sour'diesel in it has tried to moldon me since I insulated my room & put in the tents nothing has tried to mold but once you've had to fight it you learn the value of not letting the humidity climb above 60% if you can help it as well as trying to keep night temps from getting out of hand not to mention there are other bacteria that thrive in those temps as well as insect larvae
 
Cannadab1s

Cannadab1s

Well-Known Member
Yodaweed said:
I'd avoid getting grow know from hightimes, they aren't very good growers mostly just an advertising/marketing company.
Click to expand...
So much of this industry is broscience from what im learning on my first grow. Im on a mission to find out the truth so i can grow some dispensary quality bud at home, wherever the info may come from.

VPD is a staple in greenhouses nowadays.

https://www.alchimiaweb.com/blogen/vapor-pressure-deficit-cannabis-cultivation/

https://en.m.wikipedia.org/wiki/Vapour-pressure_deficit

http://www.just4growers.com/stream/temperature-humidity-and-c02/vapor-pressure-deficit-the-hidden-force-on-your-plants.aspx
 
Yodaweed

Yodaweed

Well-Known Member
Cannadab1s said:
So much of this industry is broscience from what im learning on my first grow. Im on a mission to find out the truth so i can grow some dispensary quality bud at home, wherever the info may come from.

VPD is a staple in greenhouses nowadays.

https://www.alchimiaweb.com/blogen/vapor-pressure-deficit-cannabis-cultivation/

https://en.m.wikipedia.org/wiki/Vapour-pressure_deficit

http://www.just4growers.com/stream/temperature-humidity-and-c02/vapor-pressure-deficit-the-hidden-force-on-your-plants.aspx
Click to expand...
I'm trying to help you, 75% humdity will cause mold , sometimes you just gotta learn the hard way seems like you want to do that.
 
horribleherk

horribleherk

Well-Known Member
Cannadab1s said:
Right on. She grows a sweet plant.
Click to expand...
I'm still on the learning curve with both of my leds as well as the tents leds are different than hps & the white cobs are different than the osram chips the California light works uses which are blurple but are different than the Chinese blurple such as the epistar ones
 
Cannadab1s

Cannadab1s

Well-Known Member
horribleherk said:
I'm still on the learning curve with both of my leds as well as the tents leds are different than hps & the white cobs are different than the osram chips the California light works uses which are blurple but are different than the Chinese blurple such as the epistar ones
Click to expand...
Osram just made a 307 lm/w green light...saw this only recently when i was looking for the lm301b specs. I wonder if i can add that into a light bar....
 
kingtitan

kingtitan

Well-Known Member
gonnagro said:
How critical to you feel that is. In Colorado, being the high desert, it is very difficult to maintain a humidity like that in personal grows.
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I live in a climate like yours. Add a tray of water inside the tent where the intake comes in. should bump you to 35-38. I usually start out around 22% and by flower be at 39-45 from the added humidity in my house (i vent inside house for free heat and humidity for my hardwood). I have a house humidifier but it doesn't seem to keep up.
 
Yodaweed

Yodaweed

Well-Known Member
kingtitan said:
I live in a climate like yours. Add a tray of water inside the tent where the intake comes in. should bump you to 35-38. I usually start out around 22% and by flower be at 39-45 from the added humidity in my house (i vent inside house for free heat and humidity for my hardwood). I have a house humidifier but it doesn't seem to keep up.
Click to expand...
I live in colorado too, just add more plant mass and humidity will increase. We are entering the dry season for me that means i can finally turn off my dehumidifier.
 
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