What is this? Brown stains on leaf

[LeonardLunte]

My first grow, Royal Dwarf Auto. Humidity 50-60percent, 28 degree celsius, 24/0 cycle, biobizz light mix and bio bizz grow. She is 16 days old and so far she is growing good. I spotted these the first time today and dont know what they could be. It looks like stains but I tried rubbing it and nothing happened.

 

[Hrenklin]

What medium is she in
Light type, wall draw, height
Ph level
Frequency of watering and feeding

 

[LeonardLunte]

What medium is she in
Light type, wall draw, height
Ph level
Frequency of watering and feeding

biobizz light mix is soil, LED 150w, its about 18cm tall, ph of water with nutrients is 6.8 and i water everytime the top layer of the soil is dry (every 3-4 days) about 1 liter of water mixed with 1ml of bio grow. The light is 40cm away from the plant.

 

[Hrenklin]

Raise you light up, its at more of a flowering height than veg, up to 65cm should be roughly appropriate. That could be a light calcium deficiency.

 

[Emilya Green]

let's try magnesium deficiency... calcium deficiency presents with spots in the upper leaves. Mag deficiency is very common with RO water and LED light. CalMag+ is your friend, start supplementing lightly and the problem will not progress.

 

[LeonardLunte]

let's try magnesium deficiency... calcium deficiency presents with spots in the upper leaves. Mag deficiency is very common with RO water and LED light. CalMag+ is your friend, start supplementing lightly and the problem will not progress.

Ok, thank you! I ordered some Cal Mag now and it should arrive in the next few days, but the spots keep looking worse and it seems its spreading on to the leaf next to it. Im not sure how it even got to that point, since Im always checking my ph and my other plant doesnt have this issue, even though Im watering it with the same mixture. Is there anything I can do in the mean time before the Cal Mag arrives? Thx

 

[Emilya Green]

yes, 1/2 tsp of epsom salt mixed into a spray bottle and then sprayed on the leaves can help foliar feed some magnesium in there.

 

[Emilya Green]

The damage isnt going to go away though... mag damage is permanent... but you want the spots to stop growing in number.

 

[LeonardLunte]

If I just wait for the Cal Mag to arrive in the next few days will the damage be dramatic? As in reduced yield etc...

 

[LeonardLunte]

Raise you light up, its at more of a flowering height than veg, up to 65cm should be roughly appropriate.

I also raised my light to 60cm now, as I actually started noticing some light stress, thx for the tip! I thougt 40cm is appropiate because I saw peoples diaries with the same light at that height, turns out I was always looking at the flowering stage instead of veg lol

 

[Emilya Green]

If I just wait for the Cal Mag to arrive in the next few days will the damage be dramatic? As in reduced yield etc...

It will be so undramatic that you will never know what effect it might have had, but everything is cumulative. Get it fixed as soon as you can.