Deficiency causing dark spots and yellowing

papa canna

papa canna

Well-Known Member
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.1031171633.jpg 1031171635.jpg
 
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
Click to expand...
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.
 
Last edited:
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.
Click to expand...

I would agree completely, except these plants have been in these pots for at least 4 weeks. Wouldnt I of seen it sooner?
 
First pic looks like (K) deficiency and second pic looks like (P) deficiency or mid (K) deficiency.
 
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.
 
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.
Click to expand...

Soil cooked for about 8-10 weeks. I'll try top dressing
 
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