Day 52 Flowering, Extremely yellow. Pic Included

I have an OG Kush
I have been feeding her Fox Farms Tiger Bloom and using a 400 watt HPS.
Please let me know if this is OK or what i could do what to fix it?

It looks not to bad, a little yellowing is going to happen during flowering, but that's quite a bit.. I would say N deficient, but don't quote me on that..

First check the soil pH. Next, carefully pull the plant from its pot and check the roots for binding. This is easiest when the soil is dry. If the roots are swirling around the bottom corner of the pot, then she's becoming root bound. If all else is ok, you have major deficiencies and need to give her some food.

looks good... give it some potassium it will still be fine as the plant is taking all of the nutes it needs from the leaves it will still be ok and looks to finish in 2weeks them u would trim the leaves away and have beautiful bud