HELP! Help!

[Indoor55]

Somebody knows what is happening?
2xCOB led 55w, 85cm from the plant.
Grown in hummus+lightmix, no nutes, only 6.2 Walter.

 

[F10werChyld]

Try various pH levels. If you water at 6.2 once, do the next one at 6.8 or 6.9, then 6.4 then 6.7. Different nutrients are absorbed at different pH levels.

 

[Indoor55]

I have 4 plants of this strain and all of them are great except this one, so i didn't think about nutrient lack.
I will follow your advice, thank you!
If somebody has seen this before please help. Good vibes.

 

[RetiredGuy]

Is it possible those lower leaves were laying on the soil for a while? The rest of the plant looks good.

 

[Indoor55]

No, It didn't touch the ground so idk... And the same brown spots are starting to appear in other leaves.

 

[CaptainWiese91]

Looks like It wants some cal mag or phosphorus maybe ..
Are you over watering the plant maybe ?

 

[dilvish]

Hummus? light mix? Maybe your soil has added nutrients (some do). Try flushing the pot a couple of times with plain properly PH'd water (6.5 for soil) then let them dry out 3-4 days depending on how warm your room temp is.
Humus has a negative charge which means that many of the nutrients plants require stick to humus, including ammonium (source of nitrogen), calcium, magnesium and phosphorous to name a few. The humus sponge holds onto these nutrients and prevents rain from washing them away. When a plant root comes in contact with it, the plant root is able to remove the nutrients from the humus sponge. The process is a bit more complicated than this, but you can think of humus as being a slow release source of fertilizer for your plants.

 

[Indoor55]

No bro i don't think it's overwatering because i always make sure the soil it's dry enough to water again, and this one has only recieved 2x 250ml shots

 

[Indoor55]

So interesting! I did know that It is a slow release source of nutes, but the whole process is amazing. Thank you for your help, i hope that she will be fine.