Deficient plant, help me identify and cure! <3

Below are pics of my Master Kush plant. Clearly it has a deficiency, but I don't know which one. The plant in question is 3wks into flowering and has been fed foxfarm nutes exactly as the schedule from foxfarm says. I'm in Happy Frog soil under a 250w HPS. I need help diagnosing and hopefully curing this deficiency, as it seems pretty bad. I welcome any help offered.

Leaves are very light green with dark green veins. The tips are dying and the lower leaves are all but completely dead.

pic-wise looks like zinc def. But with the full FF program, hard to swallow. Got an overall pic?

But with the yellowing, maybe a little N2 addition. Try a little bloodmeal tea?

(wait for other answers before trying my idea(s)!!)

That plant is screaming MAGNESIUM!!! The dark green veins surrounded by yellowing leaf is the giveaway. Break out the epsom salt buddy!

rolla8 said:

That plant is screaming MAGNESIUM!!! The dark green veins surrounded by yellowing leaf is the giveaway. Break out the epsom salt buddy!

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awesome, I'll give it a go.

Any idea how much to add per gallon of water?

Thanks for the help from both of you.

Ahriman said:

awesome, I'll give it a go.
Any idea how much to add per gallon of water?
Thanks for the help from both of you.

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Mix 1 tablespoon of epsom salt in one gallon of water and use that solution to flush the plants. You can also use the same solution to mist the leaves for faster uptake. Magnesium is absorb quite readily through the leaves membranes. Give it a shot and let us know how it turned out.

i agree mag def all the way. easy fix

flush it with water for 3 days then start nutes over make sure u got full npk ,,,it looks like nute burn look at black tips ,,go half strength after water flush

second that, looks more like a burn than deff, i think when you restart your nutes you might wanna go easy after