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

[wowwow5605]

I grow 42 fast buds Banana Purple Punch Auto, I grow in small tent 0.5 square meter. I use led lamp 100w.
Grow in plagron grow mix (it has nutrients for first 3 weeks)

Now my plant on day 16 and it have a big issue with leafes.

I don't understand what the problem

My grow tent params:
humidity: ~50 - 55%
temp: 27 degrees Celsius
Lamp on 24h per day, I use 24/0 schedule for lights

First 7 days I use only filtered water with ph 6.0 - 6.2

After 7 day I start add calmag and power roots from plagron, ppm 150, ph 6.0 - 6.2

Any ideas or advice what would be the problem?

[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.

[wowwow5605]

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.

I thought Power Roots and CalMag weren't the primary fertilizers and could be added in the first few weeks.

Am I correct in assuming I should water only with filtered water without any additives, with a pH of 6.5, for the first three weeks?

[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

[wowwow5605]

Bluey DabberDog Thanks so much for your advices, I have one more question, today i checked stock water add saw that it has 750 ppm, so looks like my medium has to much nutrients for start and my plant has symptoms of nutrient burn?

If don't add any nutrients first 3 week should I use this medium for future grows? Or better to find more light mix?

[Bluey]

Your reading of the tap water are incorrect. Your meter is broke

[DabberDog]

Tap or stock? Are you talking cattle water?

[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.