Could low humidity do this?

[shiva71]

Hiya
My other thread has died so ill ask here - 6 wk old DP Strawberry Cough in DWC under basic 135w QB.
Temps, pH, normal, ppm is actually dropping 100 a day so shes feeding.
Overnight the damage spread a lot, and the only thing was different was that the humidity dropped pretty low, 35%. And when i crank up the RH to 70% or so she seems to like it.
So...could this damage be due to low humidity?
Cheers!

 

[bk78]

Temps normal? What’s normal to you?

Google VPD and try and follow that as a guide for temps and humidity

Looks like you have a calcium deficiency to me.

 

[THT]

^^ second that @bk78 if everything else is truly within normal range, Cal/Mag
double triple check PH and PPM, give that water a good stir.

 

[shiva71]

24-28° or thereabouts.
Yeah ive been thinking all along it might be a deficiency. Gonna bump ppm up from 900 to 1100 and see what that does.
Will read up on VPD.
Thanks!

 

[curious2garden]

Hiya
My other thread has died so ill ask here - 6 wk old DP Strawberry Cough in DWC under basic 135w QB.
Temps, pH, normal, ppm is actually dropping 100 a day so shes feeding.
Overnight the damage spread a lot, and the only thing was different was that the humidity dropped pretty low, 35%. And when i crank up the RH to 70% or so she seems to like it.
So...could this damage be due to low humidity?
Cheers!

Those punctate rust spots are a classic lack of Ca symptom. I run 10% humidity and my plants only do that when they need Calcium. I use General Hydroponics CaliMagic because I like the ratio of Mg to Ca. Good luck and nice grow so far.

 

[shiva71]

Ok you all seem agreed thats good
Just put 200ppm of CalMag in my rez lets see how she does...or should that be more?
Thanks chaps

 

[curious2garden]

Ok you all seem agreed thats good
Just put 200ppm of CalMag in my rez lets see how she does...or should that be more?
Thanks chaps

Start there and watch. The damage will remain on the old leaves but should stop advancing.

 

[shiva71]

Sweet that seems to have done the trick, ppm and pH stable
Put my scrog in last night shes looking ok to me...
Cheers guys yous the best!

 

[KingQuazy]

Sweet that seems to have done the trick, ppm and pH stable
Put my scrog in last night shes looking ok to me...
Cheers guys yous the best!
View attachment 4572346

That scrog is awesome. I was wondering how I could avoid buying a net. Thank you for posting this picture!!! (Im gonna do mine with pvc frame)

 

[shiva71]

That scrog is awesome. I was wondering how I could avoid buying a net. Thank you for posting this picture!!! (Im gonna do mine with pvc frame)

Cheers My first scrog, its kinda fun tucking and tying the tips down!
Yeah i just drilled holes 5cm apart and threaded some string through to make the net. If youre interested...?

Super simple scrog

Hiya Pics are self explanatory, i thought of a few ways to support the frame with something attached to the dwc lid but i imagined that would be a pain. 4 hooks in frame corners, clip onto string strung to tent poles. Great thing is i will be able to just slide it up when i need to remove the...

www.rollitup.org

 

[shiva71]

Scrog update if anyones interested...she's not quite as evenly spread out as id like, need to fill the two nearest corners. There is some tip burn i think thats the nutes, im throwing a bit more at her than i probably should (ppm rising 60-80 over a day). Otherwise i think she looks great, hope it continues

 

[2Hearts]

Im still having problems following, was it not a humidity problem and that good grower who grows at low humidity just great right?

 

[shiva71]

Im still having problems following, was it not a humidity problem and that good grower who grows at low humidity just great right?

I think it was a few things, i moved her into my living room which had crazy low humidity (20%) which didnt help, plus cal def, she definitely improved with added CalMag as suggested by the guys here.

 

[teddy bonkers]

I think it was a few things, i moved her into my living room which had crazy low humidity (20%) which didnt help, plus cal def, she definitely improved with added CalMag as suggested by the guys here.

l.e.d lighting requires more ca/mg or you will see those deficiencies.

 

[shiva71]

Is this the calcium deficiency too? Quick look online and i thought yep looks like it.

 

[Cx2H]

Those punctate rust spots are a classic lack of Ca symptom. I run 10% humidity and my plants only do that when they need Calcium. I use General Hydroponics CaliMagic because I like the ratio of Mg to Ca. Good luck and nice grow so far.

Yeah. I'm in the same boat my RH is never above outside , between 10-20% and they grow just fine as long as I cover the basics.

 

[curious2garden]

Yeah. I'm in the same boat my RH is never above outside , between 10-20% and they grow just fine as long as I cover the basics.

That's good to know. Few people live outside the VPD and during winter when I can get very close to good VPD parameters my plants look like beauty queens. But during my brutal summers I'm afraid my girls look a bit ratty. Doesn't seem to change the high at all.

 

[2Hearts]

Is this the calcium deficiency too? Quick look online and i thought yep looks like it.
View attachment 4581627

No.

 

[bk78]

That's good to know. Few people live outside the VPD and during winter when I can get very close to good VPD parameters my plants look like beauty queens. But during my brutal summers I'm afraid my girls look a bit ratty. Doesn't seem to change the high at all.

I am the complete opposite. Winter I struggle hard to keep VPD in check, summer is a breeze.

 

[shiva71]

No.

Hmm. Ok!
Any ideas what it might be then? pH was up to 7 this morning too high i know, but i dunno if plants would react that quickly when the pH is off...?
Cheers!