I'm beginner in growing and I don't understand what the problem with my plant

[wowwow5605]

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[DabberDog]

I think you answered you own question.
Your medium has nutrients for three weeks, but you are giving it nutrients at one week. Stop with the nutrients.
I'm coco. Somone else is probably going to tell you your pH is too low.

[Bluey]

The pH is too low as Dabs mentioned. Raise it to 6.5 next couple of waters and dont overwater it (dont let water pour out the bottom of the pot)

Id reduce the lught schedule a bit, maybe 20/4 or 18/6.

It looks like it is improving already though.

[DabberDog]

wowwow5605 according to what you said about your soil manufacturer saying it has nutes for 3 weeks, yes, stop nutes until your plant is 3 weeks old. I know nothing about the nutrients. Or are they nutrients or supplements? There may be a feeding schedule that starts after a week, but you should follow the soil note of 3 weeks.
It is common for new and experienced growers to add nutrients to hot soil.
Bluey you and I are in the same boat about runoff. In this case, since nutrients have been added to hot soil, might it be a good idea for a quick flush?

[Bluey]

DabberDog new growth looks healthy. 150ppm is somewhere around 0.2 to 0.3 EC which is lower or at what you would give the first seedlings so Id continue with that feed schedules for another week or so then slowly increase it about 0.2 every week for the next 7 weeks. No more than 900ppm to 950ppm on the 500 scale which is about 1.8 to 1.9 EC. Most plants will max out at that with 900 odd PPFD and VPD on point

[DabberDog]

B-dog talks ppm.
Here's a thing about growing autos. This is my opinion, others will protest. Pre-made soil is not great for autos, especially new growers, because it may still contain veg nutes during flowering, which you don't need. And since you're growing autos in soil, you won't need veg nutes at all. You will only need bloom nutes.
Having said that, there isn't anything wrong with hot soil. You just have to know how to use it. Giving the pot a good flush before planting helps with hot soil. Start adding nutes at 3 weeks if the soil has 3 weeks of food. When you start adding, start with half strength. Keep good circulation going in your tent because soil has a greater propensity for buglies and wooblers.

[DabberDog]

wowwow5605 about reusing the soil you have. Here's more opinion based on experience.
After so long of using soil, it is no longer the soil you started with. That is, it does not have the same nutrients. It is, however, still a medium that will hold roots, water, and nutrients. Can you reuse soil? Yes. But you have to remember whatever soil you reuse will have residual bloom nutrients that maybe should be flushed out and will need the full veg nutrient Monty, unlike it did when fresh.