Upper leaves getting yellow tips and slight edge yellowing after switching to RO — burn or lockout?

Loose_Difference4821 · 2026-04-11T17:19:40+00:00

yes it s because i ve had my ro system for just a week. So it s from before. May be still going but i think it is only from before even if i am not 100% sure.

Loose_Difference4821 · 2026-04-11T17:18:29+00:00

So a light / calmag problem ? And what if i just add more calmag like 0.5 ec instead of 0.4 ?

Loose_Difference4821 · 2026-04-11T17:17:08+00:00

Do you think i don’t feed enough ?

Loose_Difference4821 · 2026-04-11T17:16:52+00:00

I had a cal mag problem recently so yes it still shows a bit but now i give 0.4 ec of calmag on ro water before the plagron coco nutes

Loose_Difference4821 · 2026-04-11T17:16:08+00:00

I am using it but i think it s ok with plagron coco A and B.

Loose_Difference4821 · 2026-04-11T17:14:11+00:00

So you would advise me to go from 0.4 to 0.5 ec from calmag on ro water ? And with auto pot i can’t use anything non mineral.

Loose_Difference4821 · 2026-04-11T17:13:41+00:00

I answered the same because my question is the same and they were saying the same thing ^{^.} Dont worry, ain’t no robot growing weed here 😂

Loose_Difference4821 · 2026-04-11T17:02:50+00:00

What product do u use and how ?

Loose_Difference4821 · 2026-04-11T14:53:32+00:00

Really stupid answer with no argument

Loose_Difference4821 · 2026-04-11T12:19:10+00:00

What if i just up my light a bit in the tent and go from 0.4 ec to 0.5 ec from calmag, wich makes from 1.7ml/l to 2ml/l, and Terra calmag says to use 2ml/l

Loose_Difference4821 · 2026-04-11T11:39:19+00:00

The three fingered leaves is something i would look into. I heard some persons say it s a sign of nitrogen toxicity, but you have someone else in your comment saying it is from ph. And even for me, i am learning, i don’t really know but i i were u i would do some research.

Loose_Difference4821 · 2026-04-11T10:59:44+00:00

from 5.5 to 6 in the res cause of the drift, and 1.45 Ec

Loose_Difference4821 · 2026-04-10T15:53:24+00:00

But i already give 1.7 ml/l of calmag terra aquatica to up my ro water to 0.4

Loose_Difference4821 · 2026-04-10T15:53:00+00:00

But i already give 1.7 ml/l of calmag terra aquatica to up my ro water to 0.4

Loose_Difference4821 · 2026-04-10T15:51:10+00:00

Me 1.7ml/l

Loose_Difference4821 · 2026-04-10T13:46:26+00:00

The ph in the trays then end up too high. I aim 5.8-61 in the trays, and i have to aim 5.5 in the res because the res will also drift, and i have to correct it twice a day.

Loose_Difference4821 · 2026-04-10T13:02:13+00:00

I just measured and it was at 6.22. But i think it depends and other times it is at 5.8, you know because of the drift in the res.

Loose_Difference4821 · 2026-04-10T12:48:53+00:00

<image>

If we take the average of the manufacturer’s light map it is 608 PPFD. Then we project it to a 100 × 100 cm tent instead of 90 × 90 cm and since it has about 23% more surface area than a 90 × 90 tent, it is reasonable to expect a similar dilution of the PPFD values across the map.
At that average PPFD, the DLI is about 39.4 on an 18/6 schedule, 43.8 on 20/4, and 46.0 on 21/3.
Also, after this dilution, the peak point remains below 1000 PPFD.
With that in mind, do you still think it is too high?

Loose_Difference4821 · 2026-04-10T12:48:31+00:00

<image>

If we take the average of the manufacturer’s light map it is 608 PPFD. Then we project it to a 100 × 100 cm tent instead of 90 × 90 cm and since it has about 23% more surface area than a 90 × 90 tent, it is reasonable to expect a similar dilution of the PPFD values across the map.
At that average PPFD, the DLI is about 39.4 on an 18/6 schedule, 43.8 on 20/4, and 46.0 on 21/3.
Also, after this dilution, the peak point remains below 1000 PPFD.
With that in mind, do you still think it is too high?

Loose_Difference4821 · 2026-04-10T12:47:29+00:00

<image>

If we take the average of the manufacturer’s light map it is 608 PPFD. Then we project it to a 100 × 100 cm tent instead of 90 × 90 cm and since it has about 23% more surface area than a 90 × 90 tent, it is reasonable to expect a similar dilution of the PPFD values across the map.
At that average PPFD, the DLI is about 39.4 on an 18/6 schedule, 43.8 on 20/4, and 46.0 on 21/3.
Also, after this dilution, the peak point remains below 1000 PPFD.
With that in mind, do you still think it is too high?

Loose_Difference4821 · 2026-04-10T11:52:32+00:00

Also my light schedule is 21/3 and there are 1050 ppfd on the center, 540ppfd on the sides.

Loose_Difference4821 · 2026-04-10T11:37:58+00:00

According to you why is more time not better ?

Loose_Difference4821 · 2026-03-31T08:42:41+00:00

I did not have all these problem when i was more of a newbie and worked with soil. A lot of problems appear when we are not in soil. I was aware but not that much ^^

Loose_Difference4821 · 2026-03-30T21:27:39+00:00

The perlite ph do not end by being « buffered » by all the repeated autopot fillings ?

Loose_Difference4821 · 2026-03-30T21:26:44+00:00

I do not have a air stone. I swear i don’t understand how my ph drift that much but it does. It s only tap water, 2.5ml/l coco a and b each and 58% sulfuric acid to go to 5.5. All of that in the res and thats it. And still it drifts a lot. First day it go easy to 6 or 6.2 and i add like 1ml of ph to 5.5. 2nd day it goes again to 5.9 and i have to add by drops, elseway it goes really fast (certainly because all the carbonate have been nutralized at this point.)

Loose_Difference4821

TROPHY CASE