Deficiency causing dark spots and yellowing

papa canna said:

Started showing this deficiency a week or two ago. Right before flipping to flower.

The middle leaves get spots, then eventually yellow out and die.

My soil mix
1 bag FFOF
1bag FFHF
1bag GO ancient forest Alaskan humus
30% perlite
12 cups EWC
2 cups kelp meal
2 cups 0-11-1 bat guano
2 cups dolimite lime
2 cups happy frog general purpose 5-5-5

Water only except for compost tea about once per 2 weeks. Was doing pretty well until recent.View attachment 4036430 View attachment 4036431

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Buba Blend said:

I was going to follow to see what others said. Since it is quiet I'll offer something.
I remember talking with you before about your soil mix having to much P and I think in general your soil has been to heavily amended for new soils.
This link by Jorge may help IDK.
http://ww2.marijuanagrowing.com/spots-on-leaves/
That is all I can really offer, just a guess on my part as I am new to amending soil.

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papa canna said:

I would agree completely, except these plants have been in these pots for at least 4 weeks. Wouldnt I of seen it sooner?

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hyroot said:

Phos and potassium defs. How long did you cook the soil for?

Guano takes over a month to break down. Dolomite lime takes up to 2 years to break down. Thats not enough ewc. Castings should make up a 30% of your mix.

You went pretty heavy on the amendments so it should take minimun 2 months to cook that soil mix.

Your plants are starved. Top dress some em1 bokashi and top dress more castings and feed with a seed sprout tea to speed up the breaking down amendments.

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