nitrogen during flowering stage

i have about 4 weeks of flowering left and my plant is starting to turn light green to yellow starting from the tips. the problem started in the middle of the plant and is working its way up. my question is how should i mix my veg. nutes. 1/4 strength? 1/2? the leaves are really starting to look awful and its working its way up. i still have weeks before harvest so im worried..........ill try and get pics up soon. any advice?

Try foilar feeding - take a 1/4 strength solution and spray it on your fan leaves daily. They'll improve in a couple of days.

post some pics because the spray is a great idea however if your bud leaves & buds are looking good and it is just the fans leaves and you only have a couple weeks i would just start cutting them off check out some of my albums you will see what I am talking about

Dont remove dying leaves unless they come off with a gentle tug, the leaves are yellowing because the plant is sucking the energy stored in them out before it gets rid of them. So dont be cutting leaves off unless they pose a major mold/fungi/disease risk, you just taking away the energy the plant went to all the trouble to make and store and throwing it away. The plant knows what its doing. That being said however you are correct that its kind of early and they are suffering from a nitrogen def. I just wanted to make sure you knew about the yellowing leaves at the end.
I use 1/4 strength for when i feed veg nutes in flower to keep the plants energy makers alive as long as possible.

^You took the words right outta my mouth.