6 clones different deficiency?

I have been at this a little while now. Finally switched to dtw coco. Very pleased with the results compared to promix. Ok, I have six clones from the same mother. At the end of week 4, 3 of them showed calcium deficiency in some of the fan leaves, rusty yellowing in the margins. I adjusted the ph a little higher and it has stopped. Now at the end of week 6. The other 3 plants have no sign of any issue. In a 4x8 tray, all in the same environment, and feed schedule, from the same reservoir. 78°F, 46% rh, ph 6.5, 800ppfd, 1.3 ec

• Wtf, why only 3, Any ideas?

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I have this same question. How do clones from the same plant act so differently. I saw something about the location that the clone is taken from- but I still can’t figure it out.
Do clones from tops act differently than a clone from a lower branch?- I will have to mark my pots next time.

Let's start with logic, if the fix was small, the problem was small aswell.
So maybe higher ppfd numbers in that particular space...
Also cuttings have different behaviors depending on where you take it from, tops or side branches have different amounts of hormones and pathogens in them, even though it's the same plant.
Root systems of each clone also is important and every slight change in ph or size of the root itself compared to others may have an impact on how it uptake nutrients and water, because the conditions are so consistent and identical these will be slight changes probably like you witnessed.

How many times a day do you water, and to what runoff %?

Your getting lock out do to ph to high. Coco ph should be between 5.8-6.2

Midwestsmoker419 said:

Your getting lock out do to ph to high. Coco ph should be between 5.8-6.2

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This is very important aswell, if you are in 100% coco don't drift beyond 6.2

Hollatchaboy said:

How many times a day do you water, and to what runoff %?

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3 gallon air pots. Water 1-2 times per day. Watering by hand, minimum 20% run off. Using, jacks so nute cost is reasonable so I water plenty.

Midwestsmoker419 said:

Your getting lock out do to ph to high. Coco ph should be between 5.8-6.2

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I know what everyone says, which I always followed. I trusted my instinct, raised my ph to 6.5 and my plants have never looked better. Calcium and magnesium are absorbed better at higher ph levels. So I tried it.

Next run try to get them all the same size in small container before putting into final container, that way they all fill up the final container evenly and are drinking/ drying out equally. Most likely you went to twice a day too soon or too late for those three.

DanKiller said:

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This is very important aswell, if you are in 100% coco don't drift beyond 6.2

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Mine drifted up to 6.5 before. It's not too bad as long as it's not every watering, but 5.8 - 6.2 is the ideal range.

Hollatchaboy said:

Mine drifted up to 6.5 before. It's not too bad as long as it's not every watering, but 5.8 - 6.2 is the ideal range.

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Understood.... I also like to let the ph fluctuate up and down a little. I feel like it keeps absorption of nutes more in balance.

Cabrone said:

Understood.... I also like to let the ph fluctuate up and down a little. I feel like it keeps absorption of nutes more in balance.

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I pH my solution to 5.8. It usually rises to 6.1. After a couple fertigation cycles, I'll pH it back down to 5.8. There it usually stays until refill.

Hollatchaboy said:

I pH my solution to 5.8. It usually rises to 6.1. After a couple fertigation cycles, I'll pH it back down to 5.8. There it usually stays until refill.

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Just don't let yourself lock in to what it has to be. Watch and read what your plants are telling you and find a strategy to fix it. By raising or lower the ph a little can make a big difference in fighting deficiencies. That's what I have learned.

If the pH was the problem all of them would have shown it. Same can be said for nutrients.

I use RO water under 5ppm. With a leaf temperature of 75° my VPD is fine 1.4kpa.View attachment 5390697View attachment 5390698. As I said, after the switch to coco and a fine tune adjustment, my plants have never looked better. Why would I change everything? I will say thanks for all the replies, I appreciate different opinions and ideas.

Roguedawg said:

If the pH was the problem all of them would have shown it. Same can be said for nutrients.

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Definitely partly true. That's what started my thread. Why only 3 of 6 clones in a 4x8 dtw tray? Same everything?

That's so cold...
Why so low ?
You can have a perfect VPD zone at low temperatures or high but it don't mean nothing if your plants are not in the stage they need those conditions and values.
75F leaf temp is for the last 1-2 weeks of flower
Anything below 25c before that stage will have an impact on growth, yield, even uptake of nutrients
So about your question at the end the margins of your errors are so small (as your environment and clones are same) it's very hard to define the actual problem those 3 encountered.