What's the matter with my leaves?

[gunther99]

Hi everybody!
I'm new here from Switzerland, and I decided to come here for asking you to help a friend of mine.

This is his first plant, so he's a real rookie.

He's got the problem you can see in the picture on the lower leaves of the plant.




The plant is at the 5th week, in vegetative stage, in soil.
The temperature is usually 26-28, nover over 30. In the night time 18-20.
Humidity goes from 30% to 50% right now, with a humidifier.
The lamp is 250w hps, 12h/12h, at 30cm from the top of the plant.

I took a look at the "plant problem" section, but I can't tell if it's calcium, iron, ph fluctuation, overwatering, too much nutrients...

I always check the ph of the water, even the water in the humidifier.
And once a week I use tri pack top crop, but I put just half a dose (less is better, isn't it?).

So... Anyone can help my friend?

Thank you guys!
Gunth

[Daskahn]

You said it’s only on the lower section of the plant?
when you say you check the ph of the water.. is your friend growing hydroponics? Or Is that the water you use to feed?
Are you shaking your nutes each time before you use them?
my suggestion would be to remove damaged leaves.. if only a few don’t wanna stress her to much
recalibrate your ph tester..
And half the nutes you are giving her till she recovers
mate you giving any calcium/magnesium to the plant?

but I can rule out overwatering..(not possible in hydroponics)

[gunther99]

You said it’s only on the lower section of the plant?
when you say you check the ph of the water.. is your friend growing hydroponics? Or Is that the water you use to feed?
Are you shaking your nutes each time before you use them?
my suggestion would be to remove damaged leaves.. if only a few don’t wanna stress her to much
recalibrate your ph tester..
And half the nutes you are giving her till she recovers
mate you giving any calcium/magnesium to the plant?

but I can rule out overwatering..(not possible in hydroponics)

Yes, the lower section, the leaves I removed for the pic were the lowest.
I use soil, because is easier, and I check ph for the water I put in the pot and the water I put in the humidifier.

And of course I shake nuts and ph Down every time.

Ph tester is this:

https://www.lamota.org/media/images/full/growshop/ph-test-kit.jpg

It's not super accurate, but I don't need to calibrate and it does its job. :P

For calcium/magnesium I'm using top crop top veg, and it's got this:

• Humic acids ≥ 8.3%
• Fulvic acids ≥ 1.7%
• Nitrogen, N ≥ 6.7%
• Phosphorus, P2O5 ≥ 3.4%
• Potassium, K2O ≥ 6.7%
• Magnesium, MgO ≥ 0.06%
• EDTA Chelated Microelements
• Boron, B ≥ 0.08%
• Copper Cu, ≥ 0.025%
• Iron, Fe ≥ 0.043%
• Manganese Mn ≥ 0.024%
• Zinc Zn ≥ 0.043%
• pH 7
• Rapid absorption
• Suitable for home gardening

I don't see any calcium... Do I have to add it by myself?

Thanks!

[Daskahn]

Look into getting calmag if it were me I’d say that might be your issue

[SoOrbudgal]

So are you trying to flower it? It's on 12/12 at 6wks old right? Can we see a pic of the whole plant?

[gunther99]

So are you trying to flower it? It's on 12/12 at 6wks old right? Can we see a pic of the whole plant?

Yes, it's in the flowering period, 5th week.

That's the plant.


Look healty, but lower leaves are slowly starting with this problem again...

[SoOrbudgal]

Is that a heat lamp real close to it? To me leafs look heat stressed. Is it a auto flower?

[gunther99]

Is that a heat lamp real close to it? To me leafs look heat stressed. Is it a auto flower?

No, the lamp is always at least at 30cm from the top, and it's not auto flowering seeds.

[Daskahn]

Is that a fan? Next to the bottom could it be wind burn? But I do see how all the leaves kinda wrinkle which indicates it’s to hot..

[gunther99]

Is that a fan? Next to the bottom could it be wind burn? But I do see how all the leaves kinda wrinkle which indicates it’s to hot..

Yes it's a fan. I think it's hard to wind burn anything... it's really soft.

[Daskahn]

You never know.. moving you can back just a foot would still give air circulation but prevent wind burn..

[SoOrbudgal]

Well just seems to look like heat stress fan doesn't need to be blowing hard it's heat