Guys...

If you are growing in great soil or grow medium, you should never have to fert at all during veg....up to 30 days.

Maybe a little high nitrogen like 5-1-1 or 11-4-1 AFTER week 3 or 4. Just a little. But never fert before week 3 is FINISHED!

And if your plant is smaller or runty because of light, all the nutes in the world wont help it grow any better!

NEVER.

The beauty of the soil indoor grow is that you dont have to add jack shit if you dont want to.

Hydro and bubbler are of course different, but, great soil has plenty of nutes in it already.

When you add nutes, you alter the chemical composition of the grow medium and thus alter the chemistry and hormonal balance of the plants.

Since it is soil, you would need very expensive equipment to anaylze the make up of the soil...not worth it.

Play it safe...

Use great grow medium (I still swear by PRO-MIX), never add anything until AT LEAST week 3 is over, and then, add small amounts (about 1/4 or 1/2 of recommended dosage) once per week.

Over ferting will kill faster than under nuting ever will.

Want the perfect fertilizer?

Go to the kitty litter box and grab a chunk of cat shit.

MJ LOVES CAT SHIT.

Its natural so it wont burn your plants either.