Small Buds in week 6 (GDP)

KAT-AL-LYST

KAT-AL-LYST

Member
Week4@inCharge said:
Defiantly change the bulbs. That's a low PAR. My first reaction to tacoed leaves is the VPD. You want that to be at about 120-150 at this point of the grow. Some are really anal about vpd, some dont give a rats ass, I'm in between.. whats your air movement like, how many fans you got going? TYhe other thought is maybe a deficiency, my guess is potassium.

www.dimluxlighting.com

Vapor Pressure Deficit - The Ultimate Guide - Dimlux Lighting - The Best Grow Lights

Simply put, Vapor Pressure Deficit measures the difference between the amount of drying power the atmosphere is exerting upon your plants. VPD is the key...
www.dimluxlighting.com www.dimluxlighting.com
Click to expand...
  • My average VPD over the last month has been 0.94Kpa, and over the last week 0.80.
  • My RH is set to 55%. So how do you increase VPD, without increasing RH?
  • My air movement is a single 30-inch fan that's oscillating
  • My leave surface temp is 20.3 degrees c at the opposite corner to the fan.
  • p.H is a constant 6.3 as I use a pH doser.
  • EC is 1.3
I think I am going to turn my fan up from speed one to 2 and see what happens. The aim is to disrupt the boundary layer and increase VPD without having to adjust the RH. I can't increase the ambient temp as I'm trying to induce colour.
 
Last edited:
KAT-AL-LYST

KAT-AL-LYST

Member
Week4@inCharge said:
Defiantly change the bulbs. That's a low PAR. My first reaction to tacoed leaves is the VPD. You want that to be at about 120-150 at this point of the grow. Some are really anal about vpd, some dont give a rats ass, I'm in between.. whats your air movement like, how many fans you got going? TYhe other thought is maybe a deficiency, my guess is potassium.

www.dimluxlighting.com

Vapor Pressure Deficit - The Ultimate Guide - Dimlux Lighting - The Best Grow Lights

Simply put, Vapor Pressure Deficit measures the difference between the amount of drying power the atmosphere is exerting upon your plants. VPD is the key...
www.dimluxlighting.com www.dimluxlighting.com
Click to expand...
Yup, I have this google sheet calculator.
 
Week4@inCharge

Week4@inCharge

Well-Known Member
KAT-AL-LYST said:
  • My average VPD over the last month has been 0.94Kpa, and over the last week 0.80.
  • My RH is set to 55%. So how do you increase VPD, without increasing RH?
  • My air movement is a single 30-inch fan that's oscillating
  • My leave surface temp is 20.3 degrees c at the opposite corner to the fan.
  • p.H is a constant 6.3 as I use a pH doser.
  • EC is 1.3
Click to expand...
Increasing VPD without raising RH.. if you lowered your RH that would increase that .890 to 1.2-1.5 and/or if you raised the temps.

And maybe drop that 6.3 to 5.8-6.

KAT-AL-LYST said:
So a chart you lay out on the floor of your tent. It has points on it where you place the meter every time so you can get accurate consistent readings.
Click to expand...
You can draw one up yourself with a sharpie. That's not gonna help with real world use. What your reading with flowers in the tent is what it is, not what you get in an empty tent.

Your PAR is low big time, that's why your getting small flowers. As for the tacoed leaves, itr's not the intensity of the lights. Hope you figure this one out man.
 
KAT-AL-LYST

KAT-AL-LYST

Member
Week4@inCharge said:
Increasing VPD without raising RH.. if you lowered your RH that would increase that .890 to 1.2-1.5 and/or if you raised the temps.

And maybe drop that 6.3 to 5.8-6.


You can draw one up yourself with a sharpie. That's not gonna help with real world use. What your reading with flowers in the tent is what it is, not what you get in an empty tent.

Your PAR is low big time, that's why your getting small flowers. As for the tacoed leaves, itr's not the intensity of the lights. Hope you figure this one out man.
Click to expand...
Thanks for your time and effort. I raised my RH from 50 > 55, because I was concerned the dehumidifier was constantly switching on (the set-up is in a shed outside). As for the pH, I had it at 6.0, but I noticed a calcium deficiency, so I raised it to 6.2-3 as that's the pH Ca is first absorbed at.

Thoughts?
 
KAT-AL-LYST

KAT-AL-LYST

Member
Week4@inCharge said:
Increasing VPD without raising RH.. if you lowered your RH that would increase that .890 to 1.2-1.5 and/or if you raised the temps.

And maybe drop that 6.3 to 5.8-6.


You can draw one up yourself with a sharpie. That's not gonna help with real world use. What your reading with flowers in the tent is what it is, not what you get in an empty tent.

Your PAR is low big time, that's why your getting small flowers. As for the tacoed leaves, itr's not the intensity of the lights. Hope you figure this one out man.
Click to expand...
I'm thinking of getting the AC Infinity - IONFRAME EVO8 - 730w
 
Week4@inCharge

Week4@inCharge

Well-Known Member
KAT-AL-LYST said:
Thanks for your time and effort. I raised my RH from 50 > 55, because I was concerned the dehumidifier was constantly switching on (the set-up is in a shed outside). As for the pH, I had it at 60., but I noticed a calcium deficiency, so I raised it to 6.2-3 as that's the pH Ca is first absorbed at.

Thoughts?
Click to expand...
Inkbird can help you dial that in , you can plug a dehumidifier and a humidifier in this thing.
 
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