Yellow between veins AND on new budsite growth? N, K, & Mg?

burjzyntski

Well-Known Member
My plant has gone through it's share of ups and downs, but now that it is in a pre-flowering mode, I'm paying even more attention to it's health. I even made the difficult switch from a solely-organic home-compost grow to using a chemical fertilizer that I already had (18-6-12).

The older leaves are yellow between veins (which I took to mean it had an Mg deficiency, so I added some epsom salt), but the newer low node leaves are also pretty yellow...and the only thing I can think of is an N or a K deficiency.

I would think that an N def. would be yellowing the leaves of the entire plant, but only the lowest leaves (the ones that grow between the leaf shoots and the stem - bud site leaves) are totally yellow. Could this be a K deificiency that is only showing on the smallest leaves?

The leaves on the top 6-8" of the plant are all looking healthy, except for one that twirls around, but is green.

Maybe some pics would help.
(I know they aren't the best pics, but you can still see the yellow in the places that I'm asking about)
 

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Okay, so after some more research, I think it might be an Fe or K deficiency. The young, bottom growth is pretty pale in color, and the only yellowing (and white in some spots) occurs between the green veins.

Does rust (iron oxide) from a normal nail work as an Iron supplement?

Greensand is pretty high in K...is that the same green sand that they use at golf courses?
 
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