Zinc def. or what? Early-Mid flowering!

Hi guys! This is my 2nd grow!
I have a +Speed in a pc case. It's in its 3rd week of flowering, I think I've got 2-3 to go and Im facing problems.
Despite of the yellowing fan leaves (I've put N food but nothing really changed) I have leaves shooting right out of the stem that begin to somehow yellow.
You think it is a Zinc deficiency? If yes, how do I deal with it?


I don't want to risk losing on yield!
Thanks in advance!

Cheers!

don't think so, what is your PH (both water and medium) and do you let it dry out a bit in between waterings ? and what exactly do you feed her ? need more info please, need to know if it contain cal/Mg as well as NPK (and other trace elements like Zinc and Iron copper aso)

Flowers just started popping out so probably 4-6 weeks to go ^^

Like guy above asked, what do you feed, how much and how often? What are your ph values, water on and runoff water? What medium are you using? What light?

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Avoid overfeeding, many strains at flower go yellow, better to flush, and monitor

Guys thanks for your replies!

Slipon, my soil's pH is 6.6, and my water's was 6.5 at veg stage and 6.7 now.
I have fed her: Superthrive at veg stage, Molasses at flower and BioBizz's: BioGrow, BioHeaven, BioBloom and TopMax! In different levels thorugh the grow.

Sacro, this is an auto strain, so I believe another 3 max? Maybe you're right though, 2 weeks ago I accidentaly supercropped my main branch, right before flowering so it may need some weeks more!

Vostok, thanks mate, that what I was thinking!!!

Cheers!

High P&K use in the nutrients cause yellowing in flower.....