New Grower Yellowing on regular white widow (help)

[Blissmesome]

Hey, I started a grow of regular white widow like two months ago, and she started to yellow from bottom up, eating the plant slowly.
She has lost about 10 leaves to it. and it keep spreading.
I neglected her for a while, watering late sometimes. I am back now though and will try to restore her to good health.

The environment is a little bit tricky.
it is 28-30 c / 80-86 f
switching to 12/12 tomorrow (vegged for really long time, 2 and a half months)
Biobizz Grow,bloom, top-max and root juice is the nutes.

runoff pH is around 6. Update tomorrow to be certain



Second picture is the beginning of the yellowing, progressing to what you see on the first pic.

 

[namvet25]

http://www.growweedeasy.com/magnesium-deficiency-cannabis



Looks like magnesium def.Have you been using cal/mag?

 

[Bayes]

Yup, looks like mg deficiency to me. Just my opinion, but if your runoff is accurately measuring a pH of 6.0 and assuming a feeding/watering PH of 6.5, this makes your soil pH 5.5, the probable root cause (pun intended) of your magnesium deficiency.

 

[Muddy]

I agree, a magnesium deficiency mostly likely caused by your soil pH being off and causing the magnesium to be locked out. Run off of 6 is a bit too low. As Bayes already stated, if you're feeding at a higher pH, then your actual soil pH is probably lower, low enough to cause the lockout. Let us know what the pH of your feeds are and then we can make some suggestions from there.

 

[Blissmesome]

Thanks for the replies guys, I'm having a little trouble with this grow, rarely at home and cant take care of her properly. Finally got some time on my hands and gunna buy cal/mag ASAP.
Learn more from bad grow than perfect. ~Thanks