^He's right, listen to him. Man, I'm slippin', I didn't even notice that it was flowering, til now. Doh!lol Yeah, you don't want to give it too much N at this point, or you'll end up losing some yield. If you want to go with using 1/3 strength MG, that'll slow the yellowing, but, then I'd switch to your bloom fert, after that. Actually, it depends on how close it is to being mature. If there were 6 weeks left, I'd give it some veg fert, if there were 3, I'd switch right to bloom. Either fert will be safe, as long as you stick with bloom, afterwards.
That wasn't much help, was it?lol Okay, I'll flip a coin....
I go with one more dose of the MG. if it were me.