Time has come for me to ask for help.

[strainsgrow]

Greetings all,

Recently I noticed some brownish on some of my leaves. I'm really close to switching my lights to 12/12 but I'm concern about this. I've been feeding her some Cal-Mag the past few watering's. I removed some of the worse leaves but some how this stuff keep showing up. Doesn't look like nute burn so I'm here to hear the opinions of more experienced growers. I removed the affected fan leaves to stop the propagation of whatever this is.

Tent conditions: 56% RH - 70 to 76 temps. I have an exhaust that was running 18 hrs on and 6 hrs off but I will start running it 24/7 to test. I also have a PC and a USB fan ventilating on the tent to circulate the air but not directly at the plant. I had my 300 LED light at 18 inches and just raised it to 22 to see if it improve.

Last 3 watering were as follow with two/three days in between waterings...

Watering 1:

1 Gallon distilled water
3 ts Grow Big
3 ts Big Bloom
8 ml Calmag

Watering 2:

Half gallon Plain distilled water
5 ml of Calmag

Watering 3:

Half Plain distilled water
5 ml of Calmag

She's 35/40 days old from seed.
PH in and run off is 6.5

Will appreciate some feedback. Not sure if I should flush it before going to 12/12?

 

[Cannabliss]

She may be running into P-K deficiencies? However, I’m not certain if it’s because she’s naturally running out of P-K and you may need to add some kind of P-K booster, or if the roots just aren’t taking them in. You're watering her every 2/3 days in a 2-gal pot?
Just a FYI, I wouldn’t switch to 12/12 just yet until you have this issue fixed. Switching into flower with a sick plant or even with a small deficiency may affect your final yield.

 

[strainsgrow]

I thought so. That's why I want to fix it first. She's an eater even that small. Also the pot is a smart pot and I have great ventilation with exhaust fan and also have two small USB fan circulating on the tent so the soils dry faster. Thanks for the feedback.

 

[strainsgrow]

Cannabliss thanks bro. It was in fact a P deficiensy. Added some tiger bloom last night and shes already recovering.

 

[Cannabliss]

Glad to hear that. You're very welcome my friend.