what is wrong with this plant??

4 weeks into flowering. it started looking sick, its in a drip system. 400w mh hydrofarm grow light. i am using green light super bloom 12-55-6.

closetkiller said:

4 weeks into flowering. it started looking sick, its in a drip system. 400w mh hydrofarm grow light. i am using green light super bloom 12-55-6.

Click to expand...

how much ppms of that stuff are you using,reson i ask is the middle #55 is pretty high,my flower ferts are 5 10 5.

looks like the onset of a pretty good K deficiency along with mg-usually comes from high levels of salinity. im guessin u never flushed? also those nutes do not sound good for your Sativa, they usually like less ferts and that P is way out of balance. maybe a shot of this stuff last couple of weeks before harvest, prior to final flush.
you see those crispy leaf edges in that first pic? like it or not, most of them are now going to look like that throughout the plant, from what I can see. dont bug out.
if you are using tap, is the water considered hard?

http://www.icmag.com/ic/showthread.php?t=11688

'Too much Phosphorus levels affect plant growth by suppressing the uptake of: Iron, potassium and Zinc, potentially causing deficiency symptoms of these nutrients to occur def in plants. A Zinc deficiency is most common under excessive phosphorus conditions,
As well as causing other nutrients to have absorption troubles like zinc and copper. Phosphorus fluctuates when concentrated and combined with calcium'

chang ethat from K def with Mg to K def with Zn

i don't know ppm(dont have a tester). there are no hydro shops in the area. ordered some dutch master advanced. will switch to that next week, when i get it. the water is from a well, the ph is about 7.5+, out of the tap.