If you are running MG soil, (guilty),... I'd just run PH'd water until 6th node or more. When you get a tiny amount of purple in the leave stems, or reddish in the stalks, it's time to hit 'em with 1/4 str.

The N-P-K numbers are ratios, not percentages.

So, 5-2-2 is the same as 25-10-10.

basically, the huge numbered ones, like...26-55-19... are just fucked up ratios.

find the FAQ section and look up nutrients. (could be in my siggy)

begood

be