Coco coir start of wk 9 since flip

I am having a problem I have never dealt with before. I have 4 girls growing but only one is giving me some problems. I run 3 gal pots using gh nutrients. I am using a Growers Choice roi e720 at 926 par. I feed at 1.2-1.4 ec with ph at 5.9-6.2. Temps are 78-82 degrees lights on and 68-73 lights off. Problem I am having is that about halfway down plant leaves are turning yellow at a clip of 4-5 per day. I feed daily til I get a fair amount of runoff but for the life of me I can't figure out her issue. Thanks for any and all help.

Here is better pics of leaves I plucked off tonight

Could just be the strain starting to finish out for end of flower. Do you check runoff numbers at all? I would try and water twice or three times a day.

The fading is consistent with the age a maturity of the plant. Like mentioned above, it could just be doing it's thing, sucking up the rest of those big ol nutrient banks (big sun sucker leaves). Buds and structure looks good

Ok thanks for the responses. I have really been trying to figure this out

What e.c did u run during flower ? .Is this the e.c at the moment ?

During flower u should be running higher e.c between weeks 3-7 then gradually decrease to about where ur at now given ur at 1.2-1.5max

I am running ec at 1.2- 1.4.

I feed around 3.0 EC during flower but then again I run high frequency feeding .I decrease E.C around week 7-8 depending on how bud development looks to 0.8-1.2 right to the end

This is ending of week 9

Skillcraft said:

Here is better pics of leaves I plucked off tonight View attachment 5355041

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Check the run off EC of the problem plant against the others.

I'm gonna parrot the "check your runoff ec and pH" I ran into a big lockout problem and when I checked the runoff, it was like 5 times what I was putting in.
If your runoff is higher ppm/ec than what you are putting in, mix up a light batch of feed, like 200ppm and feed it through and flush the coco until you are getting a ppm/ec reading that is lower than what you are normally feeding.

It doesnt look close to being done imo. Just looks like lockout

Skillcraft said:

Ok thanks for the responses. I have really been trying to figure this out

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Plants don't yellow because of fall fade.

higher self said:

It doesnt look close to being done imo. Just looks like lockout

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This starin has 3-4 weeks left. So no nowhere near ready

coreywebster said:

Check the run off EC of the problem plant against the others.

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I will check run off in just a bit. Lights will be on.

Skillcraft said:

This starin has 3-4 weeks left. So no nowhere near ready

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Just making sure bc first 2 replies telling you the plant is close to finish is not true. Plants shouldn't be fading (or in your case just turning yellow & dying) a month out from harvest

coreywebster said:

Check the run off EC of the problem plant against the others.

Click to expand...

I just checked run off ec and all 4 plants are close. I feed at 1.2-1.4 and run off was 1.7-1.8. so does that give you guys anything to work with

Even though runoff is higher than input, I’d say you are under feeding. Up your feed to a 2.0 and I bet it slows or stops. 1.2 is not enough even for veg imo

Those plants are locked out. Your runoff is telling you. Flush with quarter nutrients.