Can anyone tell me what this may be?

[StacyDu]

Hi everyone, this is my 3rd time growing (2nd time for autos). The 5 autoflower plants are called Expert Gorilla. They are between 4-5 weeks. And for the soil I used pro mix - hp mycorrhizae with about 30% destiny organics - dark matter My day temp is usually between 76-81 and night is 70-75, humidity is always at around 45-50%. I try to keep the water ph at about 6.5-6.7, I just took the soil ph which is at about 7.2ph (I know I need to try and lower the soil ph)
I gave them Green Planet nutrients with a little cal/mag 3 days ago at about 850ppm
I’m using a 125 watt cfl for the lower half of the plants, 2- 1,000watt led’s (1 blue/red and 1 yellow) and 2 - 600watt blue/red led’s. Pulling 650watts from the wall Now this is deficiency is only on 1 plant
(3 leaves that I can see). Any help would be greatly appreciated. Thanks

 

[BeanTownFan420]

Light burn or you need more cal/mag.Let's see what others think.

 

[Pennywise]

Where in the plant are you seeing this, top or bottom?

 

[BeanTownFan420]

If you drop ph to 6.5 you might see it disappear.

 

[Pennywise]

It looks like a phosphorus deficiency, but yea you can’t rule out lock out from high ph.

 

[StacyDu]

Where in the plant are you seeing this, top or bottom?

All 3 of these leaves are kind of just over half the plant height so around the middle

 

[BeanTownFan420]

Phosphorus is available at that high alkalinity so you need to feed more.I see droopy leaves red stem and petiole with leaf necrosis so phosphorus it is.

 

[Pennywise]

I’m still calling it Posphorus deficiency

 

[Pennywise]

They do look light green don’t they

 

[BeanTownFan420]

They are fully symptomatic of phosphorus deficiency.

 

[Pennywise]

Yes, I just get nervous at higher PH levels. But I run in coco mostly

 

[BeanTownFan420]

Try to drop ph with your next feed.And slightly up your feed amount.We hope all this helps.

 

[Pennywise]

Keep us posted on how they do

 

[StacyDu]

Phosphorus is available at that high alkalinity so you need to feed more.I see droopy leaves red stem and petiole with leaf necrosis so phosphorus it is.

Thanks!, I’ll do that!

 

[StacyDu]

I’m still calling it Posphorus deficiency

Thanks!, I’ll get some phosphorus into them.

 

[StacyDu]

Keep us posted on how they do

I will and thank you!

 

[StacyDu]

Yes, I just get nervous at higher PH levels. But I run in coco mostly

Yes I know the ph is a bit too high. I’m gonna get some phosphorus into them and lower the soil ph.

 

[StacyDu]

If you drop ph to 6.5 you might see it disappear.

I will drop the water ph to about 6 so it lowers the soil ph

 

[Pennywise]

Sounds like a plan, then give them a few days and post pics so we can check them out.

 

[StacyDu]

They do look light green don’t they

I guess you can call it light green!, they are a touch lighter than they should be