Mec Amine D 3-Way Broadleaf Herbicide is not labeled for nutsedge. If you are having problems with nutsedge in a residential lawn, we would suggest using a product like Sedgehammer Herbicide.
What fertilizer you used for lawn after applying Mec Amine D 3-Way Broadleaf Herbicide is going to vary depending on what nutrients are needed. We actually have a great guide that can explain how to select the best fertilizer for your lawn. You can find the guide here.
Mec Amine D is not labeled for hairy bittercress. You may be able to use something like Quincept instead.