There are three things which plants need for rapid growth:
Intense light
A source of carbon
Fertilizers
You will not get the desired result unless you add all three to a well planted and established tank.
It is a bit like cycling a tank
1 Set up the tank and plant it out with moderate light
2 Add a few fish to start cycling
3 When plants are established and the heavy root feeders are feeding start increasing light, fertilizers and CO2.
Plants like swords may take many weeks to establish and start feeding heavily so until that happens you are just feeding the algae.