npk values are listed in ratios. for example: N:P:K. I was chatting with shake the other day, and he was saying the ideal ratio's for veg were 5:2:3 and for flower were 1:5:4. as far as MG nutes go, some people swear by 'em, and others curse them. you might want to check out italiano's first grow. I'm pretty sure he used MG nutes and his grow was flat out awesome. here's a link to it:

http://boards.cannabis.com/grow-log/...lver-haze.html