The more nutrient/growth elements added will help plants. Any one item will help over having nothing but won't be the great solution. A combination of elements will be the great additive to spur substantial growth.
Even adding some fertilizer without any other element will help. No matter what it is, if it is a part of a plant's environment, it will help to some degree.
I have minimal lighting and only add some ferts on a weekly basis. I have found the addition of ferts does in fact help. I have compared tanks with same water, same fish and same lighting - 1 with ferts the other without. There was a clear enhancement of the plants that got a little ferilization over the one that didn't. I also compare brands of liquid ferts and have found Seachem to be a better value.
My lighting is less than 2WPG and I am going to do DIY CO2 on one (or more) of the tanks.
Lighting is simply one component of the plants needs. As is nourishment, etc.