Will P rich Bat guano be sufficient as an amendment to increase yield?

Hi I’m doing an organic soil grow using some bigger bloom miracle grow potting soil, perlite, worm castings, and sphagnum peat moss, about 25% each in a small medium pot for my 5gal space bucket, and so I was wondering; based on my first grow, it was chopped early, it had some apparent yellow ness-probably K deficiency. Considering the organic make up, what would I need to counter any deficiencies during flower?

As mentioned I got some P rich bat guano, but that’s only one thing so far (upgraded with led strips too but kind of irrelevant) Think it alone should improve my harvest? How can I fix a potential K deficiency, just kelp meal is it? Would I need it ahead of like week 6 of flowering? Thanks. Trying to expand my growing realm while still being efficient, this grow will be my 2nd in my space bucket. The photo is my first and how it looked.

That's not a K deficiency, that's a lack of N.

homebrewer said:

That's not a K deficiency, that's a lack of N.

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interesting, thanks. doubted that was a possibility given I put a fine amount of worm castings within. I’ll be sure to recognize this if it happens again, maybe add more N amendment when it does

If you're an organic guy maybe you should grow in something like promix and use liquid organics instead. Organic amendments aren't easy to balance, especially for new growers.