Light stress?? Please help diagnose my plant issues!

[meyou]

Hey all, at my wits end with trying to figure out what is wrong with my ladies any help or advice would be massively appreciated

Im running Athena nutrients, two feeds a day in 3 gallon pots with 10-15% run off. Using Coco perlite mix 70/30

Ph is 6~ and 3 EC (as per Athena guidelines) while run off is coming out at 3.5-4.2 EC and ph is 5.7-6

LED lights are roughly a foot above the canopy

It started with the tips of the fan leaves going yellow and turning upwards and slowly progressing throughout the rest of the leaf. My environment is about spot on (I think) 25 degrees Celsius/ 77 F, with the humidity at 51~

They are at the start of week 3 and the yellowing is progressively getting worse

Cheers

 

[coreywebster]

How to fix Cannabis Potassium Deficiency (K) Pics & Symptoms

Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.

www.growweedeasy.com

First off I don't use athena , but the idea of using EC of 3 is mind blowing.

Anyway, the fact your run off is much higher suggests they aren't using what your putting in or there's too much dry back.

I'd flush them with a low ec nutrient solution until that run off is far far lower.

Could do with someone who uses Athena to chime in on what EC they run at.

My standard EC in flower is about 1.4 , as is a lot of other people's so I can't get my head around why anyone would need more than double that.

 

[Delps8]

RH is a little low. No indication that it's a light issue. I don't see leaves reacting by "canoeing" and excess light impacts the leaves at the top of the plant.

Per @coreywebster, EC of 3 is high but would explain the tip burn. Not sure why the leaves would be pale yellow. What's your ventilation like?

Also, a 1' hang height is pretty low. What model light and dimmer setting?

 

[4Sku2nkd0]

RH is a little low. No indication that it's a light issue. I don't see leaves reacting by "canoeing" and excess light impacts the leaves at the top of the plant.

Per @coreywebster, EC of 3 is high but would explain the tip burn. Not sure why the leaves would be pale yellow. What's your ventilation like?

Also, a 1' hang height is pretty low. What model light and dimmer setting?

My guess the salt build up is causing other nutrients to be locked out, im with op less is more 3EC is way too high.

 

[Billy the Mountain]

Fuck Athena; there's nothing unique about their nutes except for the price.
Either they're right about feeding cannabis at 3EC or I've been wrong using MaxiGro/Bloom at ~1.5EC for a long time growing healthy plants with no signs of deficiencies.
The only possible beneficiary of feeding at 3EC is Athena.

 

[Nifty420]

The Athena pro line is exactly what the name says ,its meant to be used by professional growers with large setups. The blended line would be a much better choice . The pro line was formulated specifically for large grows that are able to maintain VPD/high light intensity and other environmental factors to pin point precision. Substrate sensors is not optional when you are using this type of nutrient IMO. This line was formulated to be used at 3EC , MaxiGro/Bloom was formulated to be used at a much lower EC as it was intended to be used for veggies growing outdoors with high VPD ,high VPD means more transpiration and that means you need alot less food in the irrigation.

 

[meyou]

How to fix Cannabis Potassium Deficiency (K) Pics & Symptoms

Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.

www.growweedeasy.com

First off I don't use athena , but the idea of using EC of 3 is mind blowing.

Anyway, the fact your run off is much higher suggests they aren't using what your putting in or there's too much dry back.

I'd flush them with a low ec nutrient solution until that run off is far far lower.

Could do with someone who uses Athena to chime in on what EC they run at.

My standard EC in flower is about 1.4 , as is a lot of other people's so I can't get my head around why anyone would need more than double that.

Appreciate the reply.

That was my exact response when i started it after a buddy suggested i use it. My previous nutes i ran about 1.8

Under normal circumstances i'd be feeding 3/4 times a day but reduced it to one after these problems started to present

 

[meyou]

RH is a little low. No indication that it's a light issue. I don't see leaves reacting by "canoeing" and excess light impacts the leaves at the top of the plant.

Per @coreywebster, EC of 3 is high but would explain the tip burn. Not sure why the leaves would be pale yellow. What's your ventilation like?

Also, a 1' hang height is pretty low. What model light and dimmer setting?

Thanks Delps

Increase to ~55 RH? Got my extraction fans cranked 24/7 so don't believe that's an issue. Thats the top end of clearance according to LED manufacturer

 

[Delps8]

Thanks Delps

Increase to ~55 RH? Got my extraction fans cranked 24/7 so don't believe that's an issue. Thats the top end of clearance according to LED manufacturer

At 77, plants in veg will do better at 60±. At 50±, they're pushing out a lot of water so they end up pulling up a lot of water which means that they're taking extra nutes.

"top end of clearance" - what light is that? 12" is a very low hang height.