What’s up with this? Yellowing

[Ryboburton]

So I’ll start by saying I’m not ultra concerned about it. But I have a plant yellowing on me. They’re all fed the same mute schedule. This one doesn’t like it. Maybe just that plant? It’s producing well. Here’s the info
Plant is sour diesel humboldt seeds.
Nine weeks in flower.
Grown in nectar 4 soil five gal fabric pots
Two 315 lec lights
4x4 footprint
Temps 78 lights on. 70 lights off. Rh hovers around 45 %
Fed the last three waterings at 600 ppm nectar of the gods line. At least I think. The water comes out at 230 or so
Ph 6.4 every time.
Any ideas? I have clones of every plant but if I get one that’s going to be a nuisance I just won’t grow it again. Any help appreciated

 

[LittleDabbie]

Can you get a reading of the run off PH?

 

[Ryboburton]

I did a slurry about a week ago. Oh was 6.8 and Ppm 235

 

[LittleDabbie]

I did a slurry about a week ago. Oh was 6.8 and Ppm 235

Could just be that plant might need to lower the ph to closer to 6 at root zone, or shes a hungry bitch and shes eating more nutes then you can keep up with..

Tagging a much more educated group of people tho..

@One drop @Aqua Man

 

[One drop]

Yes lower would be better see if you can get down to the 6 to 6.2 ish though im not familiar with the soil mix your using , 6.8 is getting to high . Od .

 

[Aqua Man]

What light are you using and how close it it? Seeing light stress especially in the middle.

How many weeks? They look good overall I wouldn't be overly concerned.

Personally I feel a higher PH near harvest is beneficial.

Any signs of mites?

 

[LittleDabbie]

What light are you using and how close it it? Seeing light stress especially in the middle.

How many weeks? They look good overall I wouldn't be overly concerned.

Personally I feel a higher PH near harvest is beneficial.

Any signs of mites?

I would disagree and call that heat stress vs light stressed, its summer its hot and my sour bubble suffered a lil of the same even after i turned down the lights fuckin heat is bullshit! lol

 

[Ryboburton]

Hey so I’m interested in that. Had some ac problems and I fixed it. But it’s hot as shit in kc. 98 outside and humid as shit. The lights are 24 inches away. 630 watts of ceramic

 

[Ryboburton]

And absolutely not a bug in the room

 

[Ryboburton]

None of the other plants show it. However I do have some leaf curl. I can’t take my lights any higher until next week. I’m a custom metal fabricator by trade so I’m designing a way to hang the lights from the bottom. Could gain a foot

 

[LittleDabbie]

Yep its summer i see it in almost everyones grow lately who asks for help leaf taco!

People will point to the VPD charts and demand you fix your grow..

I just say fuck it let mother nature take its corse and run the the a/c when you can if its above 85F.

 

[LittleDabbie]

None of the other plants show it. However I do have some leaf curl. I can’t take my lights any higher until next week. I’m a custom metal fabricator by trade so I’m designing a way to hang the lights from the bottom. Could gain a foot

Some plants can handle heat some can't genetics muh new friend :D

 

[Ryboburton]

Pretty much what I’m doing. I have enough of a harvest now to start flushing and let them roll. But want to improve where I can next time. I have two clones of each plant. All numbered so I know who’s who. They aren’t ready for flush yet I’m thinking. It’s a sativa. I’m expecting two to three more weeks

 

[Ryboburton]

Garden looks great for a first grow overall I think

 

[LittleDabbie]

Garden looks great for a first grow overall I think

100% agree you nailed it bro good job!

 

[Aqua Man]

I would disagree and call that heat stress vs light stressed, its summer its hot and my sour bubble suffered a lil of the same even after i turned down the lights fuckin heat is bullshit! lol

His day temps are 78F.

 

[Ryboburton]

Aqua man.. I simply can’t get them any lower until summer passes.

 

[LittleDabbie]

His day temps are 78F.

He also said he had some A/C problems but fixed it,, so while the A/C was down damage was done.. 98 outside = at least 85 inside, higher without the a/c running.

Light stress shows more in bleaching vs taco, tho if the lights hot as fuck that could cause the heat stress.

How to Prevent & Treat Heat Stressed Cannabis Plants

Too hot for your cannabis in the grow room? Learn how to save your plants from heat stress with a variety of techniques as well as certain supplements!

www.growweedeasy.com

"When the heat gets too high, the edges of the serrated leaves will begin to curl up even if there are no burns or other signs of light stress. "

thats my opinion anyway :D

If im wrong please convince me otherwise but atm im sticking with heat stress.

 

[LittleDabbie]

Heres light burn for comparison..

Cannabis Light Burn & Light Bleaching Symptoms & Solutions!

Light bleaching is similar to bleached hair from spending ample time under the sun. Read for more information on how to prevent and solve light bleaching.

www.growweedeasy.com

 

[Aqua Man]

VPD is not bad about 1.5KPA right about upper ideal limit.

Were these pics taken during the heat?

Notice its only affecting the upper most leaves closest to the light?

78F is a good temp for the room OP. you don't need to lower the temps any more.