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It looks like blight, I've had good results using Daconil your local Ace hardware should carry it. I also recommend using a biological fungicide as a soil drench and spray. Ace hardware: https://www.acehardware.com/departments/lawn-and-garden/lawn-care/fungicides/7098213 Biological fungicide: https://www.amazon.com/Southern-Ag-Garden-Friendly-Fungicide/dp/B014174BZM/ref=sr_1_13?crid=1P70SE17PK8AU&dchild=1&keywords=biological+fungicide&qid=1621882746&sprefix=biological+fun%2Caps%2C193&sr=8-13

If you want to use chelated iron, make sure you get one processed using EDDHA, something like this. I used DTE Acid Mix, some elemental sulfur granules and mulched with peat moss on my plants and they are doing slightly better. But, like its mentioned above, it takes time for organic fertilizer like Acid Mix to breakdown.

Horn shavings are grinded up hooves or cowhorns.

It's a natural fertilizer which slowly rots and gets absorbed by the plants. If ever you ever get your hands on it. Keep it dry otherwise it smells horrible!