Magnesium?

S

solista

New member

• Sep 12, 2017

• #1

Hi guys!
I´m running this Blackshead auto and the day before yesterday some leaves started to get yellow. Is this a Mg deficiency?
Soil: peat + perlite, some composting liquid @ 3-1-1 NPK and a few days ago some peruvian bat guano. PH at 7.0.
Thanks,

 

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aridbud

automeister

ICMag Donor

Veteran

• Sep 12, 2017

• #2

http://www.growweedeasy.com/why-cannabis-leaves-yellow

 

S

solista

New member

• Sep 12, 2017

• #3

Thanks. I checked it out and seems to be OK these lower/early leaves get yellow and drop. Anyways, I add some Epson salts. I´ve been trying to lower PH but to no avail. Watering with 6.3 water PH by adding lemon drops. BTW, organic.

 

C

calisun

Active member

• Sep 13, 2017

• #4

I'd think it was low P due to them being in flowering and needing more P and the purple petiole and necrosis. You haven't fed them anything other than what you listed?

 

S

solista

New member

• Sep 13, 2017

• #5

And a banana´s tea. Tomorrow I´ll apply some bone powder (0-20-0) and comfrey tea (8-2.6-20.5)

 

C

Cobshop

New member

• Sep 25, 2017

• #6

99% positive it's from nutrients being splashed on the leaves. This is very common and usually freaks people out. I would not start adding adding more