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Yeah, madsativa, all those reasons and more... you can't controll the foliar feed to well, other than the concentration in water part and you have no guarantee that it will be exactly where you need it to be. If you get a strong enough drop of fert on a leaf, that part of the leaf will die. Trust the roots to do their thing. Good lucks and good grows.
The yellowing is normal for all flowering plants...to a point. It increases starting about the 4-5th week until the end, with the buds staying green and juicy. The plant stops using N in this phase of life....essentially, not completely....and increases it's needs for P and K. That is why the leaves are yellowing.
Giving N at this point will make the end result nasty tasting, no matter how much you flush. As long as the buds stay healthy, who cares about the leaves. They still work for the plant when yellow.
Unsulphered Molasses can be given tho. Won't make the sun leaves green, but will give nutes they need in a natural way.