bah, i closed window and he beat me to it! BWAHAH...
K-def ?
Go download my ppm calculatur --it'll add upto 10 different products up for you and a neat little output. Liquid measurements take additional care, read instructions.
If you provide anywhere near 200ppm of K, it's not deficient.... you see it half that or worse, maybe? realyl depends on ratios to other things too.
pH
concentrations
ratios... all equally important with nutes. Each needs to be checked.. do the stuff that only requires measurements before you add things to substrate.