NPK - what do they do???

I have just added a link to my sig that briefly explains the roles of Nitrogen, Phosphorus and Potassium, the three principal fert components, and gives some related data.
Maybe some of you might find it useful.

I tried,seems people just want to start new threads for every question they haved and be spoon feed.rather than learn anything ever.

http://-list-nutes-how-there-
used