Yellow leaves and curly leaves

[CannaViridis]

Your running a pretty low VPD, plants are not transpiring.

So i should lower RH right?

 

[Mr.GreenthumbOG]

For sure.
Are they even drinking?

 

[CannaViridis]

That’s crazy. Looks like I’m gonna have a serious learning curve when I move to rockwool here this summer . If I fed my soil plants 2 ec they would hate me lmao

I’ve run an Ec of 1.8 in dwc without any problems in the past. I have this feeling it also depends on the type of nutes you use.

 

[CannaViridis]

For sure.
Are they even drinking?

Yes they are, but I dont know how much.. i dont do the top offs, since these are not at my place.

 

[jguit]

That’s crazy. Looks like I’m gonna have a serious learning curve when I move to rockwool here this summer . If I fed my soil plants 2 ec they would hate me lmao

Yea, my current grow is my first run in dtw coco. I kept upping my feed until i reached 1.5 EC and stayed there for a while since that seems to be what the coco folks we doing. I noticed my plants were just looking a little lame and decided to up my feed to 2 and their vigor returned. I'd imagine it has something to do with starting with RO and the nutes used. I don't use any additional calmag, i have a feeling that's why i need to run things a little higher.

I might try rockwool at some point too but it seems a little crazy. haha! The learning curve for coco has been minimal (coming from promix).

 

[Mr.GreenthumbOG]

If the VPD remains low, plants cannot transpire, or photosynthesize properly. They stop producing chlorophyll, which keeps the leaves green.

 

[jguit]

Good catch! Humidity is pretty high and the leaf temps are probably much lower than 77F under LEDs.

Funny, I've never paid much attention to VPD but it seems like growers have been intuitively doing it all along.

 

[CannaViridis]

I’ve run an Ec of 1.8 in dwc without any problems in the past. I have this feeling it also depends on the type of nutes you use.

Good catch! Humidity is pretty high and the leaf temps are probably much lower than 77F under LEDs.

Funny, I've never paid much attention to VPD but it seems like growers have been intuitively doing it all along.

I’ll check leaf temps and print a vpd chart. But the temps of the leafs are more likely to be 80. The 77 is measured at the bottom.

 

[jguit]

I’ll check leaf temps and print a vpd chart. But the temps of the leafs are more likely to be 80. The 77 is measured at the bottom.

Gotcha. Yea, i was thinking you were measuring above the canopy. My leaf temps are always around -5F lower.

 

[smokedareefer]

My guess, locked out because of ph swings.

I (usually) never get above 600 ppm

 

[Moshmen]

For sure.
Are they even drinking?

Good catch ! Holy cow can’t believe we missed that !

 

[Mr.GreenthumbOG]

Good catch ! Holy cow can’t believe we missed that !

I’m not saying their are not other issues, but given the overall colour, and droopy appearance of the plants, it’s my guess.

 

[smokedareefer]

Vpd is good imo

 

[growsince79]

Vpd is good imoView attachment 1211883

That's why I dont give a shit about vpd charts. The 75rh is too high. Under the leaves and the whole plant micro enviorment is probably even higher. I'd toss that chart and keep the rh under 60%

 

[CannaViridis]

thanks guys

I’m gonna adjust some of these parameters.

Give new nutes, check the roots. Throw in some pondsaver. Trime some leaves and create some better flow down low.

See if i can make the girls happy before I flip the switch.

 

[30roll]

I have a plant that is like that. When I transplanted it, the roots were brown. I was probably overwatering the crap out of it..
Root Rot..
It hasn't bounced back yet..

 

[GanjaJack]

Yeh I don't even mess with all the EC stuff... I am lucky that it all just works "automagically" for me.....

The only thing I do different from you, is the silicate... and I am wondering about what would happen if you didn't add it?

 

[CannaViridis]

I have a plant that is like that. When I transplanted it, the roots were brown. I was probably overwatering the crap out of it..
Root Rot..
It hasn't bounced back yet..

Have you tried hydrogaurd/pondsaver? I’ve had half dead plants form nice white roots within days.

 

[CannaViridis]

The droop and overall pale unhealthy look is what's making think something is going on with the roots.

roots are looking good

 

[jguit]

I'm not sure what's going on, to be honest. If everything else is good (temps, RH, light intensity, pH, roots, root zone temps) the only thing you havent tried was bumping up your EC. I'd wait for advice from another rdwc grower though.

What's the new growth looking like today? Any pics?