Is a straight SEA-90 grow possible?

Hey all great site by the way been learning a lot. I'm mostly an organic gardener(a la John Kohler from GYG) and I was amazed to see an organic hydro section here so I have a lot of reading to catch up on.

But I have my questions, I wanted to know if a straight sea-90 grow is possible for MMJ but I can't understand the equations for sea-90 in the sea-agri website from Dr Murray for hydroponics.

Thanks I appreciate any help tips or directions to where I can read a bit more

No you need to add a bit of macros, as mj has been bred to use higher levels overtime especially hybrids..

I usually use 2000ppm sea90 and 200-400ppm NPK Mg Ca

Certain landraces may need alot less macros then the hybrid counterparts..