P or K deficiency?

I'm not sure if this is Phosphorus or Potassium deficiency (or both?). These are mother plants in Sunshine #4 mix. They've been fed Super Nutrients 2-part SVA/SVB, which does happen to be low in Phosphorus. The whole plants aren't like this, just a small percentage of leaves. What do you guys think?

Is it at the bottom working it's way up, at the top, or spread out top to bottom?

Tolerance Break said:

Is it at the bottom working it's way up, at the top, or spread out top to bottom?

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It's mostly random leaves, but looking at the one plant that's in a smaller pot, I'd say it's more working it's way up from the bottom.

Here's a couple plant pics.

That's Phosphorus deficiency.

Nifty420 said:

That's Phosphorus deficiency.

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Thank you. That makes sense. I emailed the Super Nutrients company years ago and asked them if you're supposed to add Phosphorus since it's so low. They said "We assure you our nutrients have everything necessary for perfect plant growth", etc... I knew they were full of shit, that's why the old Valley OG recipe includes Big Bud and Monster Bloom.

I'll try to fix these plants by using a much more balanced nutrient. I already switched the flower room over to Gaia Green organic powder and was planning to do the same with new mother plants. I'm sick of mixing liquid chem nutes at this point.