NAA work well too.
Bottom heat enhances root development.
The rooting cycle is generally complete after 4 weeks. Begin applications approximately 1 week after sticking with 1500 ppm B-Nine, spray weekly as needed until transplanting. Consider that the water-holding capacity that is best for consumer performance may be greater than what is ideal for production. The optimum media EC is 2-2.5. Alternate with calcium nitrate on a regular basis.