HELP! What kind of deficiencies are these?

[katkootsharmoot]

Dears,

I'm attaching pictures for two plants. One is around 1 month old (we will call plant 1) and the second is almost 2 weeks old (we will call plant 2).

- Plant 1 is grown in soil, had some issues with nute burn lately and nothing worked till I flushed the soil. Now it's showing yellowing patterns mainly on the new leaves. I'm 99% there are no bugs. Plant is grown under a 130w LED with around 30k lumens.
- Plant 2 is grown in coco and hasn't shown any problems except this discoloration of the stems. I believe this is calcium/mag deficiency but I am not sure. Coco has been buffered twice before using it. Grown under the same LED but receiving 15-20k lumens.

Can I please get some opinions from this wonderful community? Pictures below.


Plant 1 (I made some circles around this specific discoloration I am talking about):





Plant 2:

[alltatup]

I have no idea from the situation you describe: could it be light burn???

[katkootsharmoot]

Doubt it. I have a lux meter and I adjusted it to only 30k lux. It's far enough from the plants too and temp never exceeds 25c.

[CaptainWiese91]

What is your Ph. ? what type of soil and how big is the pot ?? And do you feed the plant cal mag. ?
or read about magnesium deficiency?

[katkootsharmoot]

CaptainWiese91 pH for the soil is 6.7-6.8 (tested some soil in little water). Plant 1 is grown in a 3L pot and I just moved it today to a 10L pot. Plant 2: pH for coco is 6. It's still in its small seedling cup.

I've read about magnesium and all other deficiencies but they are look very similar to me. That's why I came to the community because people here probably have better eyes for this and this is only my first grow.

[katkootsharmoot]

What is your Ph. ? what type of soil and how big is the pot ?? And do you feed the plant cal mag. ?
or read about magnesium deficiency?

Also, plant 1 is grown in organic soil that should have all nutrients for couple of months. I don't add any more nutrients as the last time I did I experienced nute burn. Plant 2 I feed it NPK and CalMag twice a day.

[alltatup]

Kat, I don't know what to say other than that if you're only feeding some nutes instead of everything the plant needs, that might cause problems. As for the bigger plant: sometimes I see weird stuff going on with leaves when the plant is young that go away as she grows stronger and bigger. Have those leaves turned green?

[CaptainWiese91]

I’m my opinion your PH is a little on the higher side.
but if you don’t think it’s your Ph.
overall from what I can see from your picture. It’s not a big deal.
Could easily be from your troubles with nute burn. And the PH is fluctuating..
Is it progressed to newer leaves today ? O

[katkootsharmoot]

Which Ph should I aim for in your opinion? Also, can you tell me a reliable way to test the pH of the organic soil (I know for coco)?

[CaptainWiese91]

6,5-6,2 every feed or watering I give in that range. Some nutrients are better taken up by the roots around 6 ph.

I grow in soil to - but this PH meter I have I can use on both soil and water. I just stick in the soil and it will tell me temperature and PH levels in soil.