So LOST??? Please some guidance appreciated.

yut, well the yellow leaves could be N lockout. Yellow is usually, too wet, too little Nitrogen or no iron ( a micro nute).
But I think it still could be too much of other nutrients. So both at the same time, toxititiy, deficiency. It could be, right? :)

ye shovelhandle It could be :)

but this is a nutrients burn can you see ? http://boards.cannabis.com/plant-pro...-problems.html

The old leaves will not return to there original color watch the new growth that will tell you what is going on....

Those leaves are STARVING for Nitrogen bro!!!!! Hands down!

Either:

A: You aren't feeding enough nitrogen.
B: Something is inhibiting nitrogen uptake.

Hope that helps!