potassium or magnesium deficiency?

hey I have a deficiency in all of my plants. It starts with the lower shade leaves first and moves up, the leaf starts yellowing from the veins out and then turns brown and shrivels up, usually starting on the leaf tips. sorry I would have taken more pics but my camera died.

I looked it up and can't tell if it's a potassium or magnesium or even nitrogen deficiency. I'm pretty worried about this deficiency and would appreciate any advice!

Well the first pic,looks like a potassium def. which is also known widely by growers as the rust,because your leaves at one point will look brown/rust colored,and looks like you might need some nitrogen,but not much at all. The second pic.,you need a little nitrogen also,and potassium def. could be starting,not sure if it's mag. def. The best thing to do if you have doughts about your plants is flush,then refertalize. Hope this helps,keep her growing,lol. Stay up Oregon,the Chronic state.

smokie927 said:

Well the first pic,looks like a potassium def. which is also known widely by growers as the rust,because your leaves at one point will look brown/rust colored,and looks like you might need some nitrogen,but not much at all. The second pic.,you need a little nitrogen also,and potassium def. could be starting,not sure if it's mag. def. The best thing to do if you have doughts about your plants is flush,then refertalize. Hope this helps,keep her growing,lol. Stay up Oregon,the Chronic state.

Click to expand...

What he just said....

Oh and its not a mag def, I can tell you that for sure. Look at the veins of the leaf. They are light yellow while the rest of the leaf is green. In a mag deficiency it would be opposite: Green veins and yellow leaves.
Is it only happening on the lower fan leaf? If so than you know your in deficit somewhere.

check your pH just in case.. pH dictates nutrient absorption rates..